CISCO-SA-PHONE-DOS-TXMYNRZV
Vulnerability from csaf_cisco - Published: 2026-09-02 16:00 - Updated: 2026-09-02 16:00Summary
Cisco Desk Phone 9800 Series, IP Phone 7800 and 8800 Series, and Video Phone 8875 with SIP Software Denial of Service Vulnerability
Notes
Summary: A vulnerability in Cisco Desk Phone 9800 Series, Cisco IP Phone 7800 and 8800 Series, and Cisco Video Phone 8875 that are running Cisco Session Initiation Protocol (SIP) Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device.
This vulnerability is due to improper memory management when an affected device processes HTTP packets. An attacker could exploit this vulnerability by sending a continuous stream of crafted HTTP packets to the device. A successful exploit could allow the attacker to cause the affected device to continuously consume memory, resulting in a DoS condition. A manual reboot of the device is required to recover from this condition.
Note: For this vulnerability to be exploitable, the phone must be registered to Cisco Unified Communications Manager (Unified CM) and have Web Access enabled. Web Access is disabled by default.
Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.
Vulnerable Products: This vulnerability affects the following Cisco products if they are running a vulnerable release of Cisco SIP Software, are registered to Cisco Unified CM, and have Web Access enabled:
Desk Phone 9800 Series
IP Phone 7800 Series
IP Phone 8800 Series
Video Phone 8875
The Web Access feature is disabled by default.
For information about which Cisco software releases are vulnerable, see the Fixed Software ["#fs"] section of this advisory.
Determine Whether Web Access Is Enabled
To determine whether Web Access is enabled, use the following steps:
Press the gear icon on the front of the phone to access the Settings menu.
Choose Admin settings > Network Setup > Ethernet setup or Wi-Fi client setup > IPv4 setup. See the IP address for the phone.
On a device that has access to the internet, open a web browser and enter the IP address in the address bar. Press Enter.
If the Device Information screen appears in the web browser, then Web Access is enabled on the phone.
Products Confirmed Not Vulnerable: Only products listed in the Vulnerable Products ["#vp"] section of this advisory are known to be affected by this vulnerability.
Cisco has confirmed that these vulnerabilities do not affect Cisco IP Phone 7800 Series or 8800 Series that are running Cisco Multiplatform Firmware.
Workarounds: There are no workarounds that address this vulnerability. However, disabling Web Access mitigates this vulnerability.
To disable Web Access on a specific device, follow these steps:
Log in to the Unified CM to which the phone is registered using administrative privileges, which allow modification of devices.
Choose Device > Phone.
Enter the search criteria in the search box and click Find.
Choose the appropriate device from the Device Name list.
Under Web Access, use the toggle button to choose Disabled.
Click Save.
To verify that Web Access has been disabled, enter the IP address of the phone into a browser window on a device that has internet access, and click Enter. If the IP address is unreachable, Web Access has been disabled.
To disable Web Access on multiple devices, use the Bulk Admin Tool (BAT) as detailed in the Bulk Administration Guide for Cisco Unified Communications Manager ["https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/bat/14SU1/cucm_b_bulk-administration-guide-14SU1/cucm_b_bulk-administration-guide-1251su2_chapter_01.html"].
While this mitigation has been deployed and was proven successful in a test environment, customers should determine the applicability and effectiveness in their own environment and under their own use conditions. Customers should be aware that any workaround or mitigation that is implemented may negatively impact the functionality or performance of their network based on intrinsic customer deployment scenarios and limitations. Customers should not deploy any workarounds or mitigations before first evaluating the applicability to their own environment and any impact to such environment.
Fixed Software: Cisco considers any workarounds and mitigations (if applicable) to be temporary solutions until an upgrade to a fixed software release is available. To fully remediate this vulnerability and avoid future exposure as described in this advisory, Cisco strongly recommends that customers upgrade to the fixed software indicated in this advisory.
Fixed Releases
In the following tables, the left column lists Cisco software releases. The right column indicates whether a release is affected by the vulnerability that is described in this advisory and the first release that includes the fix for this vulnerability. Customers are advised to upgrade to an appropriate fixed software release ["https://sec.cloudapps.cisco.com/security/center/resources/security_vulnerability_policy.html#fixes"] as indicated in this section.
Desk Phone 9800 Series and Video Phone 8875
Cisco SIP Software Release First Fixed Release 4.1(1)SR1 and earlier Migrate to a fixed release. 5 5.0(1)
IP Phone 7800 and 8800 Series
Cisco SIP Software Release First Fixed Release Earlier than 14.4 Migrate to a fixed release. 14.4 14.4(1)SR3
IP Phone 8845 and 8865
Cisco SIP Software Release First Fixed Release Earlier than 14.4 Migrate to a fixed release. 14.4 14.4(1)SR4
Wireless IP Phone 8821
Cisco SIP Software Release First Fixed Release Earlier than 11.0 Migrate to a fixed release. 11.0 11.0(6)SR8
The Cisco Product Security Incident Response Team (PSIRT) validates only the affected and fixed release information that is documented in this advisory.
Vulnerability Policy: To learn about Cisco security vulnerability disclosure policies and publications, see the Security Vulnerability Policy ["http://www.cisco.com/web/about/security/psirt/security_vulnerability_policy.html"]. This document also contains instructions for obtaining fixed software and receiving security vulnerability information from Cisco.
Exploitation and Public Announcements: The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory.
Source: Cisco would like to thank Bertie Hallows for reporting this vulnerability.
Legal Disclaimer: SOFTWARE DOWNLOADS AND TECHNICAL SUPPORT
The Cisco Support and Downloads ["https://www.cisco.com/c/en/us/support/index.html"] page on Cisco.com provides information about licensing and downloads. This page can also display customer device support coverage for customers who use the My Devices tool. Please note that customers may download only software that was procured from Cisco directly or through a Cisco authorized reseller or partner and for which the license is still valid.
Customers who purchase directly from Cisco but do not hold a Cisco service contract and customers who make purchases through third-party vendors but are unsuccessful in obtaining fixed software through their point of sale should obtain upgrades by contacting the Cisco Technical Assistance Center (TAC) ["https://www.cisco.com/c/en/us/support/web/tsd-cisco-worldwide-contacts.html"]. Customers should have the product serial number available and be prepared to provide the URL of this advisory as evidence of entitlement to a free upgrade.
When considering software upgrades ["https://sec.cloudapps.cisco.com/security/center/resources/security_vulnerability_policy.html#fixes"], customers are advised to regularly consult the advisories ["https://www.cisco.com/go/psirt"] for the relevant Cisco products to determine exposure and a complete upgrade solution. In all cases, customers should ensure that the devices to be upgraded contain sufficient memory and confirm that current hardware and software configurations will continue to be supported properly by the new release. If the information is not clear, customers are advised to contact the Cisco Technical Assistance Center (TAC) ["https://www.cisco.com/c/en/us/support/web/tsd-cisco-worldwide-contacts.html"] or their contracted maintenance providers.
LEGAL DISCLAIMER DETAILS
CISCO DOES NOT MAKE ANY EXPRESS OR IMPLIED GUARANTEES OR WARRANTIES OF ANY KIND, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. WITHOUT LIMITING THE GENERALITY OF THE FOREGOING, CISCO DOES NOT GUARANTEE THE ACCURACY OR COMPLETENESS OF THIS INFORMATION. THIS DOCUMENT IS PROVIDED ON AN "AS IS" BASIS. YOUR USE OF THE INFORMATION ON THE DOCUMENT OR MATERIALS LINKED FROM THE DOCUMENT IS AT YOUR OWN RISK. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE THIS DOCUMENT AT ANY TIME.
Copies or summaries of the information contained in this Security Advisory may lack important information or contain factual errors. Customers are advised to visit the Cisco Security Advisories ["https://www.cisco.com/go/psirt"] page for the most recent version of this Security Advisory. The Cisco Product Security Incident Response Team (PSIRT) assesses only the affected and fixed release information that is documented in this advisory. See the Cisco Security Vulnerability Policy ["https://sec.cloudapps.cisco.com/security/center/resources/security_vulnerability_policy.html#fixes"] for more information.
7.5 (High)
Affected products
Known affected
111 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: CSAFPID-277608 | — |
Vendor Fix
fix
|
|
|
12.8(1)
Cisco / Cisco Session Initiation Protocol (SIP) Software
|
— |
Vendor Fix
fix
|
|
|
11.0(5)SR3
Cisco / Cisco Session Initiation Protocol (SIP) Software
|
— |
Vendor Fix
fix
|
|
|
12.8(1)SR1
Cisco / Cisco Session Initiation Protocol (SIP) Software
|
— |
Vendor Fix
fix
|
|
|
11.0(6)
Cisco / Cisco Session Initiation Protocol (SIP) Software
|
— |
Vendor Fix
fix
|
|
|
12.7(1)SR1
Cisco / Cisco Session Initiation Protocol (SIP) Software
|
— |
Vendor Fix
fix
|
|
|
10.3(1)SR6
Cisco / Cisco Session Initiation Protocol (SIP) Software
|
— |
Vendor Fix
fix
|
|
|
11.0(6)SR1
Cisco / Cisco Session Initiation Protocol (SIP) Software
|
— |
Vendor Fix
fix
|
|
|
14.0(1)SR1
Cisco / Cisco Session Initiation Protocol (SIP) Software
|
— |
Vendor Fix
fix
|
|
|
12.8(1)SR2
Cisco / Cisco Session Initiation Protocol (SIP) Software
|
— |
Vendor Fix
fix
|
|
|
14.0(1)
Cisco / Cisco Session Initiation Protocol (SIP) Software
|
— |
Vendor Fix
fix
|
|
|
10.3(1)SR7
Cisco / Cisco Session Initiation Protocol (SIP) Software
|
— |
Vendor Fix
fix
|
|
|
14.0(1)SR2
Cisco / Cisco Session Initiation Protocol (SIP) Software
|
— |
Vendor Fix
fix
|
|
|
14.1(1)
Cisco / Cisco Session Initiation Protocol (SIP) Software
|
— |
Vendor Fix
fix
|
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14.0(1)SR3
Cisco / Cisco Session Initiation Protocol (SIP) Software
|
— |
Vendor Fix
fix
|
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11.0(6)SR2
Cisco / Cisco Session Initiation Protocol (SIP) Software
|
— |
Vendor Fix
fix
|
|
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14.1(1)SR1
Cisco / Cisco Session Initiation Protocol (SIP) Software
|
— |
Vendor Fix
fix
|
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14.1(1)SR2
Cisco / Cisco Session Initiation Protocol (SIP) Software
|
— |
Vendor Fix
fix
|
|
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11.0(6)SR4
Cisco / Cisco Session Initiation Protocol (SIP) Software
|
— |
Vendor Fix
fix
|
|
|
14.2(1)
Cisco / Cisco Session Initiation Protocol (SIP) Software
|
— |
Vendor Fix
fix
|
|
|
14.2(1)SR1
Cisco / Cisco Session Initiation Protocol (SIP) Software
|
— |
Vendor Fix
fix
|
|
|
11.0(6)SR5
Cisco / Cisco Session Initiation Protocol (SIP) Software
|
— |
Vendor Fix
fix
|
|
|
14.1(1)SR3
Cisco / Cisco Session Initiation Protocol (SIP) Software
|
— |
Vendor Fix
fix
|
|
|
14.2(1)SR2
Cisco / Cisco Session Initiation Protocol (SIP) Software
|
— |
Vendor Fix
fix
|
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3.1(1)
Cisco / Cisco Session Initiation Protocol (SIP) Software
|
— |
Vendor Fix
fix
|
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3.0(1)
Cisco / Cisco Session Initiation Protocol (SIP) Software
|
— |
Vendor Fix
fix
|
|
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2.3(1)
Cisco / Cisco Session Initiation Protocol (SIP) Software
|
— |
Vendor Fix
fix
|
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2.3(1)SR1
Cisco / Cisco Session Initiation Protocol (SIP) Software
|
— |
Vendor Fix
fix
|
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2.2(1)
Cisco / Cisco Session Initiation Protocol (SIP) Software
|
— |
Vendor Fix
fix
|
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2.1(1)
Cisco / Cisco Session Initiation Protocol (SIP) Software
|
— |
Vendor Fix
fix
|
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2.0(1)
Cisco / Cisco Session Initiation Protocol (SIP) Software
|
— |
Vendor Fix
fix
|
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14.2(1)SR3
Cisco / Cisco Session Initiation Protocol (SIP) Software
|
— |
Vendor Fix
fix
|
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3.1(1)SR1
Cisco / Cisco Session Initiation Protocol (SIP) Software
|
— |
Vendor Fix
fix
|
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3.2(1)
Cisco / Cisco Session Initiation Protocol (SIP) Software
|
— |
Vendor Fix
fix
|
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14.3(1)
Cisco / Cisco Session Initiation Protocol (SIP) Software
|
— |
Vendor Fix
fix
|
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10.3(1)SR2
Cisco / Cisco Session Initiation Protocol (SIP) Software
|
— |
Vendor Fix
fix
|
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11.0(3)SR5
Cisco / Cisco Session Initiation Protocol (SIP) Software
|
— |
Vendor Fix
fix
|
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12.6(1)SR1
Cisco / Cisco Session Initiation Protocol (SIP) Software
|
— |
Vendor Fix
fix
|
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12.7(1)
Cisco / Cisco Session Initiation Protocol (SIP) Software
|
— |
Vendor Fix
fix
|
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12.0(1)SR1
Cisco / Cisco Session Initiation Protocol (SIP) Software
|
— |
Vendor Fix
fix
|
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12.6(1)
Cisco / Cisco Session Initiation Protocol (SIP) Software
|
— |
Vendor Fix
fix
|
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9.3(4)SR3 3rd Party
Cisco / Cisco Session Initiation Protocol (SIP) Software
|
— |
Vendor Fix
fix
|
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9.3(3)
Cisco / Cisco Session Initiation Protocol (SIP) Software
|
— |
Vendor Fix
fix
|
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10.2(1)SR1
Cisco / Cisco Session Initiation Protocol (SIP) Software
|
— |
Vendor Fix
fix
|
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10.3(1.9) 3rd Party
Cisco / Cisco Session Initiation Protocol (SIP) Software
|
— |
Vendor Fix
fix
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11.0(3)SR2
Cisco / Cisco Session Initiation Protocol (SIP) Software
|
— |
Vendor Fix
fix
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10.3(1.11) 3rd Party
Cisco / Cisco Session Initiation Protocol (SIP) Software
|
— |
Vendor Fix
fix
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10.4(1)SR2 3rd Party
Cisco / Cisco Session Initiation Protocol (SIP) Software
|
— |
Vendor Fix
fix
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11.0(2)
Cisco / Cisco Session Initiation Protocol (SIP) Software
|
— |
Vendor Fix
fix
|
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10.4(1) 3rd Party
Cisco / Cisco Session Initiation Protocol (SIP) Software
|
— |
Vendor Fix
fix
|
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10.3(1)SR3
Cisco / Cisco Session Initiation Protocol (SIP) Software
|
— |
Vendor Fix
fix
|
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11-0-1MSR1-1
Cisco / Cisco Session Initiation Protocol (SIP) Software
|
— |
Vendor Fix
fix
|
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10.3(1)SR4b
Cisco / Cisco Session Initiation Protocol (SIP) Software
|
— |
Vendor Fix
fix
|
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11.0(3)
Cisco / Cisco Session Initiation Protocol (SIP) Software
|
— |
Vendor Fix
fix
|
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11.0(2)SR2
Cisco / Cisco Session Initiation Protocol (SIP) Software
|
— |
Vendor Fix
fix
|
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10.3(1)SR1
Cisco / Cisco Session Initiation Protocol (SIP) Software
|
— |
Vendor Fix
fix
|
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9.3(4)SR1 3rd Party
Cisco / Cisco Session Initiation Protocol (SIP) Software
|
— |
Vendor Fix
fix
|
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12.5(1)SR2
Cisco / Cisco Session Initiation Protocol (SIP) Software
|
— |
Vendor Fix
fix
|
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11.0(3)SR6
Cisco / Cisco Session Initiation Protocol (SIP) Software
|
— |
Vendor Fix
fix
|
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12.0(1)SR2
Cisco / Cisco Session Initiation Protocol (SIP) Software
|
— |
Vendor Fix
fix
|
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12.5(1)
Cisco / Cisco Session Initiation Protocol (SIP) Software
|
— |
Vendor Fix
fix
|
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11.0(4)
Cisco / Cisco Session Initiation Protocol (SIP) Software
|
— |
Vendor Fix
fix
|
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10.1(1)SR2
Cisco / Cisco Session Initiation Protocol (SIP) Software
|
— |
Vendor Fix
fix
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11.0(5)SR1
Cisco / Cisco Session Initiation Protocol (SIP) Software
|
— |
Vendor Fix
fix
|
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11.7(1)
Cisco / Cisco Session Initiation Protocol (SIP) Software
|
— |
Vendor Fix
fix
|
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10.3(1)SR5
Cisco / Cisco Session Initiation Protocol (SIP) Software
|
— |
Vendor Fix
fix
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11.0(3)SR4
Cisco / Cisco Session Initiation Protocol (SIP) Software
|
— |
Vendor Fix
fix
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10.1(1.9)
Cisco / Cisco Session Initiation Protocol (SIP) Software
|
— |
Vendor Fix
fix
|
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11.0(1)
Cisco / Cisco Session Initiation Protocol (SIP) Software
|
— |
Vendor Fix
fix
|
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11.0(5)
Cisco / Cisco Session Initiation Protocol (SIP) Software
|
— |
Vendor Fix
fix
|
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12.0(1)SR3
Cisco / Cisco Session Initiation Protocol (SIP) Software
|
— |
Vendor Fix
fix
|
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11.5(1)
Cisco / Cisco Session Initiation Protocol (SIP) Software
|
— |
Vendor Fix
fix
|
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11.0(0.7) MPP
Cisco / Cisco Session Initiation Protocol (SIP) Software
|
— |
Vendor Fix
fix
|
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11.0(2)SR1
Cisco / Cisco Session Initiation Protocol (SIP) Software
|
— |
Vendor Fix
fix
|
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10.3(1)
Cisco / Cisco Session Initiation Protocol (SIP) Software
|
— |
Vendor Fix
fix
|
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9.3(4)SR2 3rd Party
Cisco / Cisco Session Initiation Protocol (SIP) Software
|
— |
Vendor Fix
fix
|
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11.0(3)SR3
Cisco / Cisco Session Initiation Protocol (SIP) Software
|
— |
Vendor Fix
fix
|
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11.0(4)SR3
Cisco / Cisco Session Initiation Protocol (SIP) Software
|
— |
Vendor Fix
fix
|
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12.1(1)
Cisco / Cisco Session Initiation Protocol (SIP) Software
|
— |
Vendor Fix
fix
|
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12.5(1)SR1
Cisco / Cisco Session Initiation Protocol (SIP) Software
|
— |
Vendor Fix
fix
|
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10.1(1)SR1
Cisco / Cisco Session Initiation Protocol (SIP) Software
|
— |
Vendor Fix
fix
|
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12.0(1)
Cisco / Cisco Session Initiation Protocol (SIP) Software
|
— |
Vendor Fix
fix
|
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10.2(1)
Cisco / Cisco Session Initiation Protocol (SIP) Software
|
— |
Vendor Fix
fix
|
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11.5(1)SR1
Cisco / Cisco Session Initiation Protocol (SIP) Software
|
— |
Vendor Fix
fix
|
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10.3(2)
Cisco / Cisco Session Initiation Protocol (SIP) Software
|
— |
Vendor Fix
fix
|
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9.3(4) 3rd Party
Cisco / Cisco Session Initiation Protocol (SIP) Software
|
— |
Vendor Fix
fix
|
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11.0(5)SR2
Cisco / Cisco Session Initiation Protocol (SIP) Software
|
— |
Vendor Fix
fix
|
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12.5(1)SR3
Cisco / Cisco Session Initiation Protocol (SIP) Software
|
— |
Vendor Fix
fix
|
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11.0(3)SR1
Cisco / Cisco Session Initiation Protocol (SIP) Software
|
— |
Vendor Fix
fix
|
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11.0(4)SR1
Cisco / Cisco Session Initiation Protocol (SIP) Software
|
— |
Vendor Fix
fix
|
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11.0(4)SR2
Cisco / Cisco Session Initiation Protocol (SIP) Software
|
— |
Vendor Fix
fix
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12.1(1)SR1
Cisco / Cisco Session Initiation Protocol (SIP) Software
|
— |
Vendor Fix
fix
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10.2(2)
Cisco / Cisco Session Initiation Protocol (SIP) Software
|
— |
Vendor Fix
fix
|
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10.3(1)SR4
Cisco / Cisco Session Initiation Protocol (SIP) Software
|
— |
Vendor Fix
fix
|
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14.2(1)SR4
Cisco / Cisco Session Initiation Protocol (SIP) Software
|
— |
Vendor Fix
fix
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14.3(1)SR1
Cisco / Cisco Session Initiation Protocol (SIP) Software
|
— |
Vendor Fix
fix
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14.3(1)SR2
Cisco / Cisco Session Initiation Protocol (SIP) Software
|
— |
Vendor Fix
fix
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14.3(1)SR3
Cisco / Cisco Session Initiation Protocol (SIP) Software
|
— |
Vendor Fix
fix
|
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3.3(1)
Cisco / Cisco Session Initiation Protocol (SIP) Software
|
— |
Vendor Fix
fix
|
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3.4(1)
Cisco / Cisco Session Initiation Protocol (SIP) Software
|
— |
Vendor Fix
fix
|
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11.0(6)SR6
Cisco / Cisco Session Initiation Protocol (SIP) Software
|
— |
Vendor Fix
fix
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3.5(1)
Cisco / Cisco Session Initiation Protocol (SIP) Software
|
— |
Vendor Fix
fix
|
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14.4(1)
Cisco / Cisco Session Initiation Protocol (SIP) Software
|
— |
Vendor Fix
fix
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14.4(1)SR1
Cisco / Cisco Session Initiation Protocol (SIP) Software
|
— |
Vendor Fix
fix
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14.4(1)SR2
Cisco / Cisco Session Initiation Protocol (SIP) Software
|
— |
Vendor Fix
fix
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3.5(1)SR1
Cisco / Cisco Session Initiation Protocol (SIP) Software
|
— |
Vendor Fix
fix
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3.6(1)
Cisco / Cisco Session Initiation Protocol (SIP) Software
|
— |
Vendor Fix
fix
|
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4.0(1)
Cisco / Cisco Session Initiation Protocol (SIP) Software
|
— |
Vendor Fix
fix
|
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4.1(1)
Cisco / Cisco Session Initiation Protocol (SIP) Software
|
— |
Vendor Fix
fix
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4.1(1)SR1
Cisco / Cisco Session Initiation Protocol (SIP) Software
|
— |
Vendor Fix
fix
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11.0(6)SR7
Cisco / Cisco Session Initiation Protocol (SIP) Software
|
— |
Vendor Fix
fix
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References
8 references
Acknowledgments
{
"document": {
"acknowledgments": [
{
"summary": "Cisco would like to thank Bertie Hallows for reporting this vulnerability."
}
],
"category": "csaf_security_advisory",
"csaf_version": "2.0",
"notes": [
{
"category": "summary",
"text": "A vulnerability in Cisco Desk Phone 9800 Series, Cisco IP Phone 7800 and 8800 Series, and Cisco Video Phone 8875 that are running Cisco Session Initiation Protocol (SIP) Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device.\r\n\r\nThis vulnerability is due to improper memory management when an affected device processes HTTP packets. An attacker could exploit this vulnerability by sending a continuous stream of crafted HTTP packets to the device. A successful exploit could allow the attacker to cause the affected device to continuously consume memory, resulting in a DoS condition. A manual reboot of the device is required to recover from this condition.\r\n\r\nNote: For this vulnerability to be exploitable, the phone must be registered to Cisco Unified Communications Manager (Unified CM) and have Web Access enabled. Web Access is disabled by default.\r\n\r\nCisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.\r\n\r\n",
"title": "Summary"
},
{
"category": "general",
"text": "This vulnerability affects the following Cisco products if they are running a vulnerable release of Cisco SIP Software, are registered to Cisco Unified CM, and have Web Access enabled:\r\n\r\nDesk Phone 9800 Series\r\nIP Phone 7800 Series\r\nIP Phone 8800 Series\r\nVideo Phone 8875\r\n\r\nThe Web Access feature is disabled by default.\r\n\r\nFor information about which Cisco software releases are vulnerable, see the Fixed Software [\"#fs\"] section of this advisory.\r\n\r\nDetermine Whether Web Access Is Enabled\r\n\r\nTo determine whether Web Access is enabled, use the following steps:\r\n\r\nPress the gear icon on the front of the phone to access the Settings menu.\r\nChoose Admin settings \u003e Network Setup \u003e Ethernet setup or Wi-Fi client setup \u003e IPv4 setup. See the IP address for the phone.\r\nOn a device that has access to the internet, open a web browser and enter the IP address in the address bar. Press Enter.\r\n\r\nIf the Device Information screen appears in the web browser, then Web Access is enabled on the phone.",
"title": "Vulnerable Products"
},
{
"category": "general",
"text": "Only products listed in the Vulnerable Products [\"#vp\"] section of this advisory are known to be affected by this vulnerability.\r\n\r\nCisco has confirmed that these vulnerabilities do not affect Cisco IP Phone 7800 Series or 8800 Series that are running Cisco Multiplatform Firmware.",
"title": "Products Confirmed Not Vulnerable"
},
{
"category": "general",
"text": "There are no workarounds that address this vulnerability. However, disabling Web Access mitigates this vulnerability.\r\n\r\nTo disable Web Access on a specific device, follow these steps:\r\n\r\nLog in to the Unified CM to which the phone is registered using administrative privileges, which allow modification of devices.\r\nChoose Device \u003e Phone.\r\nEnter the search criteria in the search box and click Find.\r\nChoose the appropriate device from the Device Name list.\r\nUnder Web Access, use the toggle button to choose Disabled.\r\nClick Save.\r\n\r\nTo verify that Web Access has been disabled, enter the IP address of the phone into a browser window on a device that has internet access, and click Enter. If the IP address is unreachable, Web Access has been disabled.\r\n\r\nTo disable Web Access on multiple devices, use the Bulk Admin Tool (BAT) as detailed in the Bulk Administration Guide for Cisco Unified Communications Manager [\"https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/bat/14SU1/cucm_b_bulk-administration-guide-14SU1/cucm_b_bulk-administration-guide-1251su2_chapter_01.html\"].\r\n\r\nWhile this mitigation has been deployed and was proven successful in a test environment, customers should determine the applicability and effectiveness in their own environment and under their own use conditions. Customers should be aware that any workaround or mitigation that is implemented may negatively impact the functionality or performance of their network based on intrinsic customer deployment scenarios and limitations. Customers should not deploy any workarounds or mitigations before first evaluating the applicability to their own environment and any impact to such environment.",
"title": "Workarounds"
},
{
"category": "general",
"text": "Cisco considers any workarounds and mitigations (if applicable) to be temporary solutions until an upgrade to a fixed software release is available. To fully remediate this vulnerability and avoid future exposure as described in this advisory, Cisco strongly recommends that customers upgrade to the fixed software indicated in this advisory.\r\n Fixed Releases\r\nIn the following tables, the left column lists Cisco software releases. The right column indicates whether a release is affected by the vulnerability that is described in this advisory and the first release that includes the fix for this vulnerability. Customers are advised to upgrade to an appropriate fixed software release [\"https://sec.cloudapps.cisco.com/security/center/resources/security_vulnerability_policy.html#fixes\"] as indicated in this section.\r\n\r\nDesk Phone 9800 Series and Video Phone 8875\r\n Cisco SIP Software Release First Fixed Release 4.1(1)SR1 and earlier Migrate to a fixed release. 5 5.0(1)\r\nIP Phone 7800 and 8800 Series\r\n Cisco SIP Software Release First Fixed Release Earlier than 14.4 Migrate to a fixed release. 14.4 14.4(1)SR3\r\nIP Phone 8845 and 8865\r\n Cisco SIP Software Release First Fixed Release Earlier than 14.4 Migrate to a fixed release. 14.4 14.4(1)SR4\r\nWireless IP Phone 8821\r\n Cisco SIP Software Release First Fixed Release Earlier than 11.0 Migrate to a fixed release. 11.0 11.0(6)SR8\r\nThe Cisco Product Security Incident Response Team (PSIRT) validates only the affected and fixed release information that is documented in this advisory.",
"title": "Fixed Software"
},
{
"category": "general",
"text": "To learn about Cisco security vulnerability disclosure policies and publications, see the Security Vulnerability Policy [\"http://www.cisco.com/web/about/security/psirt/security_vulnerability_policy.html\"]. This document also contains instructions for obtaining fixed software and receiving security vulnerability information from Cisco.",
"title": "Vulnerability Policy"
},
{
"category": "general",
"text": "The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory.",
"title": "Exploitation and Public Announcements"
},
{
"category": "general",
"text": "Cisco would like to thank Bertie Hallows for reporting this vulnerability.",
"title": "Source"
},
{
"category": "legal_disclaimer",
"text": "SOFTWARE DOWNLOADS AND TECHNICAL SUPPORT\r\n\r\nThe Cisco Support and Downloads [\"https://www.cisco.com/c/en/us/support/index.html\"] page on Cisco.com provides information about licensing and downloads. This page can also display customer device support coverage for customers who use the My Devices tool. Please note that customers may download only software that was procured from Cisco directly or through a Cisco authorized reseller or partner and for which the license is still valid.\r\n\r\nCustomers who purchase directly from Cisco but do not hold a Cisco service contract and customers who make purchases through third-party vendors but are unsuccessful in obtaining fixed software through their point of sale should obtain upgrades by contacting the Cisco Technical Assistance Center (TAC) [\"https://www.cisco.com/c/en/us/support/web/tsd-cisco-worldwide-contacts.html\"]. Customers should have the product serial number available and be prepared to provide the URL of this advisory as evidence of entitlement to a free upgrade.\r\n\r\nWhen considering software upgrades [\"https://sec.cloudapps.cisco.com/security/center/resources/security_vulnerability_policy.html#fixes\"], customers are advised to regularly consult the advisories [\"https://www.cisco.com/go/psirt\"] for the relevant Cisco products to determine exposure and a complete upgrade solution. In all cases, customers should ensure that the devices to be upgraded contain sufficient memory and confirm that current hardware and software configurations will continue to be supported properly by the new release. If the information is not clear, customers are advised to contact the Cisco Technical Assistance Center (TAC) [\"https://www.cisco.com/c/en/us/support/web/tsd-cisco-worldwide-contacts.html\"] or their contracted maintenance providers.\r\nLEGAL DISCLAIMER DETAILS\r\n\r\nCISCO DOES NOT MAKE ANY EXPRESS OR IMPLIED GUARANTEES OR WARRANTIES OF ANY KIND, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. WITHOUT LIMITING THE GENERALITY OF THE FOREGOING, CISCO DOES NOT GUARANTEE THE ACCURACY OR COMPLETENESS OF THIS INFORMATION. THIS DOCUMENT IS PROVIDED ON AN \"AS IS\" BASIS. YOUR USE OF THE INFORMATION ON THE DOCUMENT OR MATERIALS LINKED FROM THE DOCUMENT IS AT YOUR OWN RISK. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE THIS DOCUMENT AT ANY TIME.\r\n\r\nCopies or summaries of the information contained in this Security Advisory may lack important information or contain factual errors. Customers are advised to visit the Cisco Security Advisories [\"https://www.cisco.com/go/psirt\"] page for the most recent version of this Security Advisory. The Cisco Product Security Incident Response Team (PSIRT) assesses only the affected and fixed release information that is documented in this advisory. See the Cisco Security Vulnerability Policy [\"https://sec.cloudapps.cisco.com/security/center/resources/security_vulnerability_policy.html#fixes\"] for more information.",
"title": "Legal Disclaimer"
}
],
"publisher": {
"category": "vendor",
"contact_details": "psirt@cisco.com",
"issuing_authority": "Cisco PSIRT",
"name": "Cisco",
"namespace": "https://wwww.cisco.com"
},
"references": [
{
"category": "self",
"summary": "Cisco Desk Phone 9800 Series, IP Phone 7800 and 8800 Series, and Video Phone 8875 with SIP Software Denial of Service Vulnerability",
"url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-phone-dos-txMYNRzv"
},
{
"category": "external",
"summary": "Cisco Security Vulnerability Policy",
"url": "https://sec.cloudapps.cisco.com/security/center/resources/security_vulnerability_policy.html"
},
{
"category": "external",
"summary": "Bulk Administration Guide for Cisco Unified Communications Manager",
"url": "https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/bat/14SU1/cucm_b_bulk-administration-guide-14SU1/cucm_b_bulk-administration-guide-1251su2_chapter_01.html"
},
{
"category": "external",
"summary": "fixed software release",
"url": "https://sec.cloudapps.cisco.com/security/center/resources/security_vulnerability_policy.html#fixes"
},
{
"category": "external",
"summary": "Security Vulnerability Policy",
"url": "http://www.cisco.com/web/about/security/psirt/security_vulnerability_policy.html"
},
{
"category": "external",
"summary": "Cisco Support and Downloads",
"url": "https://www.cisco.com/c/en/us/support/index.html"
},
{
"category": "external",
"summary": "Cisco Technical Assistance Center (TAC)",
"url": "https://www.cisco.com/c/en/us/support/web/tsd-cisco-worldwide-contacts.html"
},
{
"category": "external",
"summary": "the advisories",
"url": "https://www.cisco.com/go/psirt"
}
],
"title": "Cisco Desk Phone 9800 Series, IP Phone 7800 and 8800 Series, and Video Phone 8875 with SIP Software Denial of Service Vulnerability",
"tracking": {
"current_release_date": "2026-09-02T16:00:00+00:00",
"generator": {
"date": "2026-09-02T15:54:17+00:00",
"engine": {
"name": "TVCE"
}
},
"id": "cisco-sa-phone-dos-txMYNRzv",
"initial_release_date": "2026-09-02T16:00:00+00:00",
"revision_history": [
{
"date": "2026-09-02T15:54:03+00:00",
"number": "1.0.0",
"summary": "Initial public release."
}
],
"status": "final",
"version": "1.0.0"
}
},
"product_tree": {
"branches": [
{
"branches": [
{
"branches": [
{
"branches": [
{
"category": "service_pack",
"name": "12.8(1)",
"product": {
"name": "12.8(1)",
"product_id": "CSAFPID-279887"
}
},
{
"category": "service_pack",
"name": "12.8(1)SR1",
"product": {
"name": "12.8(1)SR1",
"product_id": "CSAFPID-281401"
}
},
{
"category": "service_pack",
"name": "12.8(1)SR2",
"product": {
"name": "12.8(1)SR2",
"product_id": "CSAFPID-283851"
}
}
],
"category": "product_version",
"name": "12.8"
},
{
"branches": [
{
"category": "service_pack",
"name": "11.0(5)SR3",
"product": {
"name": "11.0(5)SR3",
"product_id": "CSAFPID-279893"
}
},
{
"category": "service_pack",
"name": "11.0(6)",
"product": {
"name": "11.0(6)",
"product_id": "CSAFPID-281404"
}
},
{
"category": "service_pack",
"name": "11.0(6)SR1",
"product": {
"name": "11.0(6)SR1",
"product_id": "CSAFPID-282071"
}
},
{
"category": "service_pack",
"name": "11.0(6)SR2",
"product": {
"name": "11.0(6)SR2",
"product_id": "CSAFPID-286549"
}
},
{
"category": "service_pack",
"name": "11.0(6)SR4",
"product": {
"name": "11.0(6)SR4",
"product_id": "CSAFPID-292625"
}
},
{
"category": "service_pack",
"name": "11.0(6)SR5",
"product": {
"name": "11.0(6)SR5",
"product_id": "CSAFPID-301554"
}
},
{
"category": "service_pack",
"name": "11.0(3)SR5",
"product": {
"name": "11.0(3)SR5",
"product_id": "CSAFPID-304878"
}
},
{
"category": "service_pack",
"name": "11.0(3)SR2",
"product": {
"name": "11.0(3)SR2",
"product_id": "CSAFPID-305000"
}
},
{
"category": "service_pack",
"name": "11.0(2)",
"product": {
"name": "11.0(2)",
"product_id": "CSAFPID-305004"
}
},
{
"category": "service_pack",
"name": "11-0-1MSR1-1",
"product": {
"name": "11-0-1MSR1-1",
"product_id": "CSAFPID-305007"
}
},
{
"category": "service_pack",
"name": "11.0(3)",
"product": {
"name": "11.0(3)",
"product_id": "CSAFPID-305014"
}
},
{
"category": "service_pack",
"name": "11.0(2)SR2",
"product": {
"name": "11.0(2)SR2",
"product_id": "CSAFPID-305016"
}
},
{
"category": "service_pack",
"name": "11.0(3)SR6",
"product": {
"name": "11.0(3)SR6",
"product_id": "CSAFPID-305029"
}
},
{
"category": "service_pack",
"name": "11.0(4)",
"product": {
"name": "11.0(4)",
"product_id": "CSAFPID-305069"
}
},
{
"category": "service_pack",
"name": "11.0(5)SR1",
"product": {
"name": "11.0(5)SR1",
"product_id": "CSAFPID-305116"
}
},
{
"category": "service_pack",
"name": "11.0(3)SR4",
"product": {
"name": "11.0(3)SR4",
"product_id": "CSAFPID-305120"
}
},
{
"category": "service_pack",
"name": "11.0(1)",
"product": {
"name": "11.0(1)",
"product_id": "CSAFPID-305123"
}
},
{
"category": "service_pack",
"name": "11.0(5)",
"product": {
"name": "11.0(5)",
"product_id": "CSAFPID-305125"
}
},
{
"category": "service_pack",
"name": "11.0(0.7) MPP",
"product": {
"name": "11.0(0.7) MPP",
"product_id": "CSAFPID-305132"
}
},
{
"category": "service_pack",
"name": "11.0(2)SR1",
"product": {
"name": "11.0(2)SR1",
"product_id": "CSAFPID-305134"
}
},
{
"category": "service_pack",
"name": "11.0(3)SR3",
"product": {
"name": "11.0(3)SR3",
"product_id": "CSAFPID-305138"
}
},
{
"category": "service_pack",
"name": "11.0(4)SR3",
"product": {
"name": "11.0(4)SR3",
"product_id": "CSAFPID-305139"
}
},
{
"category": "service_pack",
"name": "11.0(5)SR2",
"product": {
"name": "11.0(5)SR2",
"product_id": "CSAFPID-305180"
}
},
{
"category": "service_pack",
"name": "11.0(3)SR1",
"product": {
"name": "11.0(3)SR1",
"product_id": "CSAFPID-305187"
}
},
{
"category": "service_pack",
"name": "11.0(4)SR1",
"product": {
"name": "11.0(4)SR1",
"product_id": "CSAFPID-305188"
}
},
{
"category": "service_pack",
"name": "11.0(4)SR2",
"product": {
"name": "11.0(4)SR2",
"product_id": "CSAFPID-305189"
}
},
{
"category": "service_pack",
"name": "11.0(6)SR6",
"product": {
"name": "11.0(6)SR6",
"product_id": "CSAFPID-306413"
}
},
{
"category": "service_pack",
"name": "11.0(6)SR7",
"product": {
"name": "11.0(6)SR7",
"product_id": "CSAFPID-308886"
}
}
],
"category": "product_version",
"name": "11.0"
},
{
"branches": [
{
"category": "service_pack",
"name": "10.3(1)SR6",
"product": {
"name": "10.3(1)SR6",
"product_id": "CSAFPID-281459"
}
},
{
"category": "service_pack",
"name": "10.3(1)SR7",
"product": {
"name": "10.3(1)SR7",
"product_id": "CSAFPID-283853"
}
},
{
"category": "service_pack",
"name": "10.3(1)SR2",
"product": {
"name": "10.3(1)SR2",
"product_id": "CSAFPID-304873"
}
},
{
"category": "service_pack",
"name": "10.3(1.9) 3rd Party",
"product": {
"name": "10.3(1.9) 3rd Party",
"product_id": "CSAFPID-304999"
}
},
{
"category": "service_pack",
"name": "10.3(1.11) 3rd Party",
"product": {
"name": "10.3(1.11) 3rd Party",
"product_id": "CSAFPID-305001"
}
},
{
"category": "service_pack",
"name": "10.3(1)SR3",
"product": {
"name": "10.3(1)SR3",
"product_id": "CSAFPID-305006"
}
},
{
"category": "service_pack",
"name": "10.3(1)SR4b",
"product": {
"name": "10.3(1)SR4b",
"product_id": "CSAFPID-305012"
}
},
{
"category": "service_pack",
"name": "10.3(1)SR1",
"product": {
"name": "10.3(1)SR1",
"product_id": "CSAFPID-305017"
}
},
{
"category": "service_pack",
"name": "10.3(1)SR5",
"product": {
"name": "10.3(1)SR5",
"product_id": "CSAFPID-305119"
}
},
{
"category": "service_pack",
"name": "10.3(1)",
"product": {
"name": "10.3(1)",
"product_id": "CSAFPID-305136"
}
},
{
"category": "service_pack",
"name": "10.3(2)",
"product": {
"name": "10.3(2)",
"product_id": "CSAFPID-305176"
}
},
{
"category": "service_pack",
"name": "10.3(1)SR4",
"product": {
"name": "10.3(1)SR4",
"product_id": "CSAFPID-305202"
}
}
],
"category": "product_version",
"name": "10.3"
},
{
"branches": [
{
"category": "service_pack",
"name": "12.7(1)SR1",
"product": {
"name": "12.7(1)SR1",
"product_id": "CSAFPID-281458"
}
},
{
"category": "service_pack",
"name": "12.7(1)",
"product": {
"name": "12.7(1)",
"product_id": "CSAFPID-304881"
}
}
],
"category": "product_version",
"name": "12.7"
},
{
"branches": [
{
"category": "service_pack",
"name": "14.0(1)SR1",
"product": {
"name": "14.0(1)SR1",
"product_id": "CSAFPID-283850"
}
},
{
"category": "service_pack",
"name": "14.0(1)",
"product": {
"name": "14.0(1)",
"product_id": "CSAFPID-283852"
}
},
{
"category": "service_pack",
"name": "14.0(1)SR2",
"product": {
"name": "14.0(1)SR2",
"product_id": "CSAFPID-284257"
}
},
{
"category": "service_pack",
"name": "14.0(1)SR3",
"product": {
"name": "14.0(1)SR3",
"product_id": "CSAFPID-285927"
}
}
],
"category": "product_version",
"name": "14.0"
},
{
"branches": [
{
"category": "service_pack",
"name": "14.1(1)",
"product": {
"name": "14.1(1)",
"product_id": "CSAFPID-285922"
}
},
{
"category": "service_pack",
"name": "14.1(1)SR1",
"product": {
"name": "14.1(1)SR1",
"product_id": "CSAFPID-290621"
}
},
{
"category": "service_pack",
"name": "14.1(1)SR2",
"product": {
"name": "14.1(1)SR2",
"product_id": "CSAFPID-290622"
}
},
{
"category": "service_pack",
"name": "14.1(1)SR3",
"product": {
"name": "14.1(1)SR3",
"product_id": "CSAFPID-301555"
}
}
],
"category": "product_version",
"name": "14.1"
},
{
"branches": [
{
"category": "service_pack",
"name": "14.2(1)",
"product": {
"name": "14.2(1)",
"product_id": "CSAFPID-292674"
}
},
{
"category": "service_pack",
"name": "14.2(1)SR1",
"product": {
"name": "14.2(1)SR1",
"product_id": "CSAFPID-299970"
}
},
{
"category": "service_pack",
"name": "14.2(1)SR2",
"product": {
"name": "14.2(1)SR2",
"product_id": "CSAFPID-301556"
}
},
{
"category": "service_pack",
"name": "14.2(1)SR3",
"product": {
"name": "14.2(1)SR3",
"product_id": "CSAFPID-302750"
}
},
{
"category": "service_pack",
"name": "14.2(1)SR4",
"product": {
"name": "14.2(1)SR4",
"product_id": "CSAFPID-306405"
}
}
],
"category": "product_version",
"name": "14.2"
},
{
"branches": [
{
"category": "service_pack",
"name": "2.3(1)",
"product": {
"name": "2.3(1)",
"product_id": "CSAFPID-302742"
}
},
{
"category": "service_pack",
"name": "2.3(1)SR1",
"product": {
"name": "2.3(1)SR1",
"product_id": "CSAFPID-302743"
}
}
],
"category": "product_version",
"name": "2.3"
},
{
"branches": [
{
"category": "service_pack",
"name": "9.3(4)SR3 3rd Party",
"product": {
"name": "9.3(4)SR3 3rd Party",
"product_id": "CSAFPID-304988"
}
},
{
"category": "service_pack",
"name": "9.3(3)",
"product": {
"name": "9.3(3)",
"product_id": "CSAFPID-304993"
}
},
{
"category": "service_pack",
"name": "9.3(4)SR1 3rd Party",
"product": {
"name": "9.3(4)SR1 3rd Party",
"product_id": "CSAFPID-305018"
}
},
{
"category": "service_pack",
"name": "9.3(4)SR2 3rd Party",
"product": {
"name": "9.3(4)SR2 3rd Party",
"product_id": "CSAFPID-305137"
}
},
{
"category": "service_pack",
"name": "9.3(4) 3rd Party",
"product": {
"name": "9.3(4) 3rd Party",
"product_id": "CSAFPID-305179"
}
}
],
"category": "product_version",
"name": "9.3"
},
{
"branches": [
{
"category": "service_pack",
"name": "3.1(1)",
"product": {
"name": "3.1(1)",
"product_id": "CSAFPID-302739"
}
},
{
"category": "service_pack",
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{
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{
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{
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{
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},
{
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{
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{
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},
{
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{
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{
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{
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{
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},
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{
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},
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},
{
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},
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},
{
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},
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},
{
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},
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},
{
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},
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},
{
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},
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},
{
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},
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},
{
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},
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},
{
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},
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},
{
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},
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},
{
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},
"product_reference": "CSAFPID-308767",
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},
{
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},
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{
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{
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},
{
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},
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{
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{
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},
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},
{
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},
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},
{
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},
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},
{
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},
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},
{
"category": "installed_on",
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"name": "Cisco Session Initiation Protocol (SIP) Software 4.1(1)SR1 when installed on Cisco Video Phone 8875",
"product_id": "CSAFPID-308776:300248"
},
"product_reference": "CSAFPID-308776",
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},
{
"category": "installed_on",
"full_product_name": {
"name": "Cisco Session Initiation Protocol (SIP) Software 4.1(1)SR1 when installed on Cisco Desk Phone 9800 Series",
"product_id": "CSAFPID-308776:302642"
},
"product_reference": "CSAFPID-308776",
"relates_to_product_reference": "CSAFPID-302642"
}
]
},
"vulnerabilities": [
{
"cve": "CVE-2026-20281",
"ids": [
{
"system_name": "Cisco Bug ID",
"text": "CSCwu46389"
},
{
"system_name": "Cisco Bug ID",
"text": "CSCwu46406"
},
{
"system_name": "Cisco Bug ID",
"text": "CSCwu46404"
},
{
"system_name": "Cisco Bug ID",
"text": "CSCwu46407"
},
{
"system_name": "Cisco Bug ID",
"text": "CSCwu56541"
},
{
"system_name": "Cisco Bug ID",
"text": "CSCwu46391"
},
{
"system_name": "Cisco Bug ID",
"text": "CSCwu46394"
},
{
"system_name": "Cisco Bug ID",
"text": "CSCwu46395"
},
{
"system_name": "Cisco Bug ID",
"text": "CSCwu46397"
},
{
"system_name": "Cisco Bug ID",
"text": "CSCwu69663"
}
],
"notes": [
{
"category": "other",
"text": "Complete.",
"title": "Affected Product Comprehensiveness"
}
],
"product_status": {
"known_affected": [
"CSAFPID-277608",
"CSAFPID-279887",
"CSAFPID-279893",
"CSAFPID-281401",
"CSAFPID-281404",
"CSAFPID-281458",
"CSAFPID-281459",
"CSAFPID-282071",
"CSAFPID-283850",
"CSAFPID-283851",
"CSAFPID-283852",
"CSAFPID-283853",
"CSAFPID-284257",
"CSAFPID-285922",
"CSAFPID-285927",
"CSAFPID-286549",
"CSAFPID-290621",
"CSAFPID-290622",
"CSAFPID-292625",
"CSAFPID-292674",
"CSAFPID-299970",
"CSAFPID-301554",
"CSAFPID-301555",
"CSAFPID-301556",
"CSAFPID-302739",
"CSAFPID-302741",
"CSAFPID-302742",
"CSAFPID-302743",
"CSAFPID-302745",
"CSAFPID-302747",
"CSAFPID-302749",
"CSAFPID-302750",
"CSAFPID-302971",
"CSAFPID-303027",
"CSAFPID-303029",
"CSAFPID-304873",
"CSAFPID-304878",
"CSAFPID-304880",
"CSAFPID-304881",
"CSAFPID-304897",
"CSAFPID-304968",
"CSAFPID-304988",
"CSAFPID-304993",
"CSAFPID-304998",
"CSAFPID-304999",
"CSAFPID-305000",
"CSAFPID-305001",
"CSAFPID-305003",
"CSAFPID-305004",
"CSAFPID-305005",
"CSAFPID-305006",
"CSAFPID-305007",
"CSAFPID-305012",
"CSAFPID-305014",
"CSAFPID-305016",
"CSAFPID-305017",
"CSAFPID-305018",
"CSAFPID-305022",
"CSAFPID-305029",
"CSAFPID-305048",
"CSAFPID-305068",
"CSAFPID-305069",
"CSAFPID-305114",
"CSAFPID-305116",
"CSAFPID-305118",
"CSAFPID-305119",
"CSAFPID-305120",
"CSAFPID-305121",
"CSAFPID-305123",
"CSAFPID-305125",
"CSAFPID-305126",
"CSAFPID-305128",
"CSAFPID-305132",
"CSAFPID-305134",
"CSAFPID-305136",
"CSAFPID-305137",
"CSAFPID-305138",
"CSAFPID-305139",
"CSAFPID-305141",
"CSAFPID-305142",
"CSAFPID-305143",
"CSAFPID-305154",
"CSAFPID-305159",
"CSAFPID-305174",
"CSAFPID-305176",
"CSAFPID-305179",
"CSAFPID-305180",
"CSAFPID-305183",
"CSAFPID-305187",
"CSAFPID-305188",
"CSAFPID-305189",
"CSAFPID-305198",
"CSAFPID-305199",
"CSAFPID-305202",
"CSAFPID-306405",
"CSAFPID-306406",
"CSAFPID-306407",
"CSAFPID-306408",
"CSAFPID-306410",
"CSAFPID-306412",
"CSAFPID-306413",
"CSAFPID-306498",
"CSAFPID-308766",
"CSAFPID-308767",
"CSAFPID-308768",
"CSAFPID-308769",
"CSAFPID-308771",
"CSAFPID-308773",
"CSAFPID-308775",
"CSAFPID-308776",
"CSAFPID-308886"
]
},
"release_date": "2026-09-02T16:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"details": "Cisco has released software updates that address this vulnerability.",
"product_ids": [
"CSAFPID-277608",
"CSAFPID-279887",
"CSAFPID-279893",
"CSAFPID-281401",
"CSAFPID-281404",
"CSAFPID-281458",
"CSAFPID-281459",
"CSAFPID-282071",
"CSAFPID-283850",
"CSAFPID-283851",
"CSAFPID-283852",
"CSAFPID-283853",
"CSAFPID-284257",
"CSAFPID-285922",
"CSAFPID-285927",
"CSAFPID-286549",
"CSAFPID-290621",
"CSAFPID-290622",
"CSAFPID-292625",
"CSAFPID-292674",
"CSAFPID-299970",
"CSAFPID-301554",
"CSAFPID-301555",
"CSAFPID-301556",
"CSAFPID-302739",
"CSAFPID-302741",
"CSAFPID-302742",
"CSAFPID-302743",
"CSAFPID-302745",
"CSAFPID-302747",
"CSAFPID-302749",
"CSAFPID-302750",
"CSAFPID-302971",
"CSAFPID-303027",
"CSAFPID-303029",
"CSAFPID-304873",
"CSAFPID-304878",
"CSAFPID-304880",
"CSAFPID-304881",
"CSAFPID-304897",
"CSAFPID-304968",
"CSAFPID-304988",
"CSAFPID-304993",
"CSAFPID-304998",
"CSAFPID-304999",
"CSAFPID-305000",
"CSAFPID-305001",
"CSAFPID-305003",
"CSAFPID-305004",
"CSAFPID-305005",
"CSAFPID-305006",
"CSAFPID-305007",
"CSAFPID-305012",
"CSAFPID-305014",
"CSAFPID-305016",
"CSAFPID-305017",
"CSAFPID-305018",
"CSAFPID-305022",
"CSAFPID-305029",
"CSAFPID-305048",
"CSAFPID-305068",
"CSAFPID-305069",
"CSAFPID-305114",
"CSAFPID-305116",
"CSAFPID-305118",
"CSAFPID-305119",
"CSAFPID-305120",
"CSAFPID-305121",
"CSAFPID-305123",
"CSAFPID-305125",
"CSAFPID-305126",
"CSAFPID-305128",
"CSAFPID-305132",
"CSAFPID-305134",
"CSAFPID-305136",
"CSAFPID-305137",
"CSAFPID-305138",
"CSAFPID-305139",
"CSAFPID-305141",
"CSAFPID-305142",
"CSAFPID-305143",
"CSAFPID-305154",
"CSAFPID-305159",
"CSAFPID-305174",
"CSAFPID-305176",
"CSAFPID-305179",
"CSAFPID-305180",
"CSAFPID-305183",
"CSAFPID-305187",
"CSAFPID-305188",
"CSAFPID-305189",
"CSAFPID-305198",
"CSAFPID-305199",
"CSAFPID-305202",
"CSAFPID-306405",
"CSAFPID-306406",
"CSAFPID-306407",
"CSAFPID-306408",
"CSAFPID-306410",
"CSAFPID-306412",
"CSAFPID-306413",
"CSAFPID-306498",
"CSAFPID-308766",
"CSAFPID-308767",
"CSAFPID-308768",
"CSAFPID-308769",
"CSAFPID-308771",
"CSAFPID-308773",
"CSAFPID-308775",
"CSAFPID-308776",
"CSAFPID-308886"
],
"url": "https://software.cisco.com"
}
],
"scores": [
{
"cvss_v3": {
"baseScore": 7.5,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
"products": [
"CSAFPID-277608",
"CSAFPID-279887",
"CSAFPID-279893",
"CSAFPID-281401",
"CSAFPID-281404",
"CSAFPID-281458",
"CSAFPID-281459",
"CSAFPID-282071",
"CSAFPID-283850",
"CSAFPID-283851",
"CSAFPID-283852",
"CSAFPID-283853",
"CSAFPID-284257",
"CSAFPID-285922",
"CSAFPID-285927",
"CSAFPID-286549",
"CSAFPID-290621",
"CSAFPID-290622",
"CSAFPID-292625",
"CSAFPID-292674",
"CSAFPID-299970",
"CSAFPID-301554",
"CSAFPID-301555",
"CSAFPID-301556",
"CSAFPID-302739",
"CSAFPID-302741",
"CSAFPID-302742",
"CSAFPID-302743",
"CSAFPID-302745",
"CSAFPID-302747",
"CSAFPID-302749",
"CSAFPID-302750",
"CSAFPID-302971",
"CSAFPID-303027",
"CSAFPID-303029",
"CSAFPID-304873",
"CSAFPID-304878",
"CSAFPID-304880",
"CSAFPID-304881",
"CSAFPID-304897",
"CSAFPID-304968",
"CSAFPID-304988",
"CSAFPID-304993",
"CSAFPID-304998",
"CSAFPID-304999",
"CSAFPID-305000",
"CSAFPID-305001",
"CSAFPID-305003",
"CSAFPID-305004",
"CSAFPID-305005",
"CSAFPID-305006",
"CSAFPID-305007",
"CSAFPID-305012",
"CSAFPID-305014",
"CSAFPID-305016",
"CSAFPID-305017",
"CSAFPID-305018",
"CSAFPID-305022",
"CSAFPID-305029",
"CSAFPID-305048",
"CSAFPID-305068",
"CSAFPID-305069",
"CSAFPID-305114",
"CSAFPID-305116",
"CSAFPID-305118",
"CSAFPID-305119",
"CSAFPID-305120",
"CSAFPID-305121",
"CSAFPID-305123",
"CSAFPID-305125",
"CSAFPID-305126",
"CSAFPID-305128",
"CSAFPID-305132",
"CSAFPID-305134",
"CSAFPID-305136",
"CSAFPID-305137",
"CSAFPID-305138",
"CSAFPID-305139",
"CSAFPID-305141",
"CSAFPID-305142",
"CSAFPID-305143",
"CSAFPID-305154",
"CSAFPID-305159",
"CSAFPID-305174",
"CSAFPID-305176",
"CSAFPID-305179",
"CSAFPID-305180",
"CSAFPID-305183",
"CSAFPID-305187",
"CSAFPID-305188",
"CSAFPID-305189",
"CSAFPID-305198",
"CSAFPID-305199",
"CSAFPID-305202",
"CSAFPID-306405",
"CSAFPID-306406",
"CSAFPID-306407",
"CSAFPID-306408",
"CSAFPID-306410",
"CSAFPID-306412",
"CSAFPID-306413",
"CSAFPID-306498",
"CSAFPID-308766",
"CSAFPID-308767",
"CSAFPID-308768",
"CSAFPID-308769",
"CSAFPID-308771",
"CSAFPID-308773",
"CSAFPID-308775",
"CSAFPID-308776",
"CSAFPID-308886"
]
}
],
"title": "Cisco Desk Phone 9800 Series, IP Phone 7800 and 8800 Series, and Video Phone 8875 with SIP Software Denial of Service Vulnerability"
}
]
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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