CVE-2026-67277 (GCVE-0-2026-67277)

Vulnerability from cvelistv5 – Published: 2026-09-05 20:00 – Updated: 2026-09-11 03:55
VLAI CISA ENISA Previdian
Title
Kernel memory disclosure and denial of service in MikroTik RouterOS btest service
Summary
RouterOS accepts a "related" btest connection before the corresponding primary session has completed authentication. An unauthenticated client can use this state to start an IPv4 UDP test. With "random-data=false", the sender transmits an uninitialized tail from a kernel packet buffer. A separate unchecked, inverted packet-size interval causes unsigned integer underflow, anomalously large fragmented output, and can restart the RouterOS kernel. This issue was fixed in versions: 6.49.21 (Long-term), 7.23.4 (Long-term) and 7.24.2 (Stable)
Severity
8.8 (High)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N
SSVC
Exploitation: active Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-08 00:00 UTC
CWE
  • CWE-306 - Missing authentication for critical function
Assigner
CERT-PL CNA under the ENISA root
CNA scorecard B 81/100 over 257 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Mikrotik RouterOS Affected: 7.24 , < 7.24.2 (custom)
Affected: 7.0.0 , < 7.23.4 (custom)
Affected: 6.0.0 , < 6.49.21 (custom)
    cpe:2.3:a:mikrotik:routeros:*:*:*:*:*:*:*:*
Create a notification for this product.
Credits
Sławomir Rozbicki (CERT.PL)
CISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: bb0ee1ae-defa-495f-8b5a-7242b86d5ccb

Vulnerability ID: CVE-2026-67277

Status: Confirmed

Status Updated: 2026-09-10 00:00 UTC

Exploited: Yes

Timestamps
First Seen: 2026-09-10
Asserted: 2026-09-10
Scope
Notes: MikroTik RouterOS Missing Authentication for Critical Function Vulnerability | Affected: MikroTik / RouterOS | Description: MikroTik RouterOS contains a missing authentication for critical function vulnerability which allows kernel memory disclosure and denial of service in the btest service. | Required action: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines. | Due date: 2026-09-13 | Known ransomware campaign use (KEV): Unknown | Notes (KEV): https://mikrotik.com/supportsec/september-2026-vulnerability/ ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-67277
Evidence

Type: Vendor Report

Signal: Successful Exploitation

Confidence: 80%

Source: cisa-kev

Details
Cwes CWE-306
Feed CISA Known Exploited Vulnerabilities Catalog
Product RouterOS
Due Date 2026-09-13
Date Added 2026-09-10
Vendorproject MikroTik
Vulnerabilityname MikroTik RouterOS Missing Authentication for Critical Function Vulnerability
Knownransomwarecampaignuse Unknown
References
Created: 2026-09-10 20:00 UTC | Updated: 2026-11-04 13:01 UTC
ENISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 1d9ea784-c941-41ec-aa5f-c1cb172bcb68

Vulnerability ID: CVE-2026-67277

Status: Confirmed

Status Updated: 2026-09-05 00:00 UTC

Exploited: Yes

Timestamps
First Seen: 2026-09-05
Asserted: 2026-09-05
Scope
Notes: MikroTrick | Affected: MikroTik / RouterOS | Description: RouterOS accepts a 'related' btest connection before the corresponding primary session has completed authentication. An unauthenticated client can use this state to start an IPv4 UDP test. With 'random-data=false', the sender transmits an uninitialized tail from a kernel packet buffer. A separate unchecked, inverted packet-size interval causes unsigned integer underflow, anomalously large fragmented output, and can restart the RouterOS kernel. This issue was fixed in versions: 6.49.21 (Long-term), 7.23.4 (Long-term) and 7.24.2 (Stable) | Patched since: 2026/09/03 | Exploitation type: unknown | CWEs: CWE-306 | Origin source: CERT.PL | Notes: https://cert.pl/en/posts/2026/09/vulnerabilities-in-mikrotik-routeros-actively-exploited/
Evidence

Type: Csirt Report

Signal: Successful Exploitation

Confidence: 75%

Source: enisa-cnw-kev

Details
Cwes CWE-306
Euvd EUVD-2026-72025
Notes https://cert.pl/en/posts/2026/09/vulnerabilities-in-mikrotik-routeros-actively-exploited/
Catalog ENISA / EU CSIRTs Network (CNW) KEV JSON
Product RouterOS
Datereported 2026/09/05
Originsource CERT.PL
Patchedsince 2026/09/03
Vendorproject MikroTik
Exploitationtype unknown
Vulnerabilityname MikroTrick
Threatactorsexploiting
References
Created: 2026-09-05 22:00 UTC | Updated: 2026-09-05 22:00 UTC
Previdian
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: cca02293-7749-4ac4-9ec4-adceddd4aa0d

Vulnerability ID: CVE-2026-67277

Status: Confirmed

Status Updated: 2026-09-10 19:50 UTC

Exploited: Yes

Timestamps
First Seen: 2026-09-10
Asserted: 2026-09-10
Scope
Notes: Kernel memory disclosure and denial of service in MikroTik RouterOS btest service | Affected: Mikrotik / RouterOS | CVSS: 8.8 (HIGH) | EPSS: 0.00435 | Used in malware: unknown | Not yet in CISA KEV: False
Evidence

Type: Public Report

Signal: Successful Exploitation

Confidence: 70%

Source: previdian

Details
Feed Previdian (previdian.com)
Title Kernel memory disclosure and denial of service in MikroTik RouterOS btest service
Cve Id CVE-2026-67277
Vendor Mikrotik
Ghsa Id GHSA-6Q2X-6FHJ-R3W8
Product RouterOS
Added Date 2026-09-10T19:50:56.536Z
Cvss Score 8.8
Epss Score 0.00435
Previous Ids
Cvss Severity HIGH
Virtual Patch False
Cvss Estimated False
Epss Percentile 0.36743
Used In Malware unknown
Vulnerability Id CVE-2026-67277
Ahead Of Cisa Kev None
Not Yet In Cisa Kev False
References
Created: 2026-09-11 20:01 UTC | Updated: 2026-09-11 20:01 UTC
Show details on NVD website
To clipboard 

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}



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Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
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Vulnerability timeline

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