CVE-2025-20333 (GCVE-0-2025-20333)

Vulnerability from cvelistv5 – Published: 2025-09-25 16:12 – Updated: 2025-11-05 21:03
VLAI? CISA KEV
Summary
A vulnerability in the VPN web server of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an authenticated, remote attacker to execute arbitrary code on an affected device. This vulnerability is due to improper validation of user-supplied input in HTTP(S) requests. An attacker with valid VPN user credentials could exploit this vulnerability by sending crafted HTTP requests to an affected device. A successful exploit could allow the attacker to execute arbitrary code as root, possibly resulting in the complete compromise of the affected device.
CWE
  • CWE-120 - Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
Assigner
Impacted products
Vendor Product Version
Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software Affected: 9.8.1
Affected: 9.8.1.5
Affected: 9.8.1.7
Affected: 9.8.2
Affected: 9.8.2.8
Affected: 9.8.2.14
Affected: 9.8.2.15
Affected: 9.8.2.17
Affected: 9.8.2.20
Affected: 9.8.2.24
Affected: 9.8.2.26
Affected: 9.8.2.28
Affected: 9.8.2.33
Affected: 9.8.2.35
Affected: 9.8.2.38
Affected: 9.8.3.8
Affected: 9.8.3.11
Affected: 9.8.3.14
Affected: 9.8.3.16
Affected: 9.8.3.18
Affected: 9.8.3.21
Affected: 9.8.3
Affected: 9.8.3.26
Affected: 9.8.3.29
Affected: 9.8.4
Affected: 9.8.4.3
Affected: 9.8.4.7
Affected: 9.8.4.8
Affected: 9.8.4.10
Affected: 9.8.4.12
Affected: 9.8.4.15
Affected: 9.8.4.17
Affected: 9.8.2.45
Affected: 9.8.4.25
Affected: 9.8.4.20
Affected: 9.8.4.22
Affected: 9.8.4.26
Affected: 9.8.4.29
Affected: 9.8.4.32
Affected: 9.8.4.33
Affected: 9.8.4.34
Affected: 9.8.4.35
Affected: 9.8.4.39
Affected: 9.8.4.40
Affected: 9.8.4.41
Affected: 9.8.4.43
Affected: 9.8.4.44
Affected: 9.8.4.45
Affected: 9.8.4.46
Affected: 9.8.4.48
Affected: 9.12.1
Affected: 9.12.1.2
Affected: 9.12.1.3
Affected: 9.12.2
Affected: 9.12.2.4
Affected: 9.12.2.5
Affected: 9.12.2.9
Affected: 9.12.3
Affected: 9.12.3.2
Affected: 9.12.3.7
Affected: 9.12.4
Affected: 9.12.3.12
Affected: 9.12.3.9
Affected: 9.12.2.1
Affected: 9.12.4.2
Affected: 9.12.4.4
Affected: 9.12.4.7
Affected: 9.12.4.10
Affected: 9.12.4.13
Affected: 9.12.4.8
Affected: 9.12.4.18
Affected: 9.12.4.24
Affected: 9.12.4.26
Affected: 9.12.4.29
Affected: 9.12.4.30
Affected: 9.12.4.35
Affected: 9.12.4.37
Affected: 9.12.4.38
Affected: 9.12.4.39
Affected: 9.12.4.40
Affected: 9.12.4.41
Affected: 9.12.4.47
Affected: 9.12.4.48
Affected: 9.12.4.50
Affected: 9.12.4.52
Affected: 9.12.4.54
Affected: 9.12.4.55
Affected: 9.12.4.56
Affected: 9.12.4.58
Affected: 9.12.4.62
Affected: 9.12.4.65
Affected: 9.12.4.67
Affected: 9.14.1
Affected: 9.14.1.10
Affected: 9.14.1.6
Affected: 9.14.1.15
Affected: 9.14.1.19
Affected: 9.14.1.30
Affected: 9.14.2
Affected: 9.14.2.4
Affected: 9.14.2.8
Affected: 9.14.2.13
Affected: 9.14.2.15
Affected: 9.14.3
Affected: 9.14.3.1
Affected: 9.14.3.9
Affected: 9.14.3.11
Affected: 9.14.3.13
Affected: 9.14.3.18
Affected: 9.14.3.15
Affected: 9.14.4
Affected: 9.14.4.6
Affected: 9.14.4.7
Affected: 9.14.4.12
Affected: 9.14.4.13
Affected: 9.14.4.14
Affected: 9.14.4.15
Affected: 9.14.4.17
Affected: 9.14.4.22
Affected: 9.14.4.23
Affected: 9.14.4.24
Affected: 9.16.1
Affected: 9.16.1.28
Affected: 9.16.2
Affected: 9.16.2.3
Affected: 9.16.2.7
Affected: 9.16.2.11
Affected: 9.16.2.13
Affected: 9.16.2.14
Affected: 9.16.3
Affected: 9.16.3.3
Affected: 9.16.3.14
Affected: 9.16.3.15
Affected: 9.16.3.19
Affected: 9.16.3.23
Affected: 9.16.4
Affected: 9.16.4.9
Affected: 9.16.4.14
Affected: 9.16.4.18
Affected: 9.16.4.19
Affected: 9.16.4.27
Affected: 9.16.4.38
Affected: 9.16.4.39
Affected: 9.16.4.42
Affected: 9.16.4.48
Affected: 9.16.4.55
Affected: 9.16.4.57
Affected: 9.16.4.61
Affected: 9.16.4.62
Affected: 9.16.4.67
Affected: 9.16.4.70
Affected: 9.16.4.71
Affected: 9.16.4.76
Affected: 9.16.4.82
Affected: 9.16.4.84
Affected: 9.17.1
Affected: 9.17.1.7
Affected: 9.17.1.9
Affected: 9.17.1.10
Affected: 9.17.1.11
Affected: 9.17.1.13
Affected: 9.17.1.15
Affected: 9.17.1.20
Affected: 9.17.1.30
Affected: 9.17.1.33
Affected: 9.17.1.39
Affected: 9.18.1
Affected: 9.18.1.3
Affected: 9.18.2
Affected: 9.18.2.5
Affected: 9.18.2.7
Affected: 9.18.2.8
Affected: 9.18.3
Affected: 9.18.3.39
Affected: 9.18.3.46
Affected: 9.18.3.53
Affected: 9.18.3.55
Affected: 9.18.3.56
Affected: 9.18.4
Affected: 9.18.4.5
Affected: 9.18.4.8
Affected: 9.18.4.22
Affected: 9.18.4.24
Affected: 9.18.4.29
Affected: 9.18.4.34
Affected: 9.18.4.40
Affected: 9.19.1
Affected: 9.19.1.5
Affected: 9.19.1.9
Affected: 9.19.1.12
Affected: 9.19.1.18
Affected: 9.19.1.22
Affected: 9.19.1.24
Affected: 9.19.1.27
Affected: 9.19.1.28
Affected: 9.19.1.31
Affected: 9.20.1
Affected: 9.20.1.5
Affected: 9.20.2
Affected: 9.20.2.10
Affected: 9.20.2.21
Affected: 9.20.2.22
Affected: 9.20.3
Affected: 9.20.3.4
Affected: 9.22.1.1
Affected: 9.22.1.2
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    Cisco Cisco Secure Firewall Threat Defense (FTD) Software Affected: 6.2.3
Affected: 6.2.3.1
Affected: 6.2.3.2
Affected: 6.2.3.3
Affected: 6.2.3.4
Affected: 6.2.3.5
Affected: 6.2.3.6
Affected: 6.2.3.7
Affected: 6.2.3.8
Affected: 6.2.3.10
Affected: 6.2.3.11
Affected: 6.2.3.9
Affected: 6.2.3.12
Affected: 6.2.3.13
Affected: 6.2.3.14
Affected: 6.2.3.15
Affected: 6.2.3.16
Affected: 6.2.3.17
Affected: 6.2.3.18
Affected: 6.6.0
Affected: 6.6.0.1
Affected: 6.6.1
Affected: 6.6.3
Affected: 6.6.4
Affected: 6.6.5
Affected: 6.6.5.1
Affected: 6.6.5.2
Affected: 6.6.7
Affected: 6.6.7.1
Affected: 6.6.7.2
Affected: 6.4.0
Affected: 6.4.0.1
Affected: 6.4.0.3
Affected: 6.4.0.2
Affected: 6.4.0.4
Affected: 6.4.0.5
Affected: 6.4.0.6
Affected: 6.4.0.7
Affected: 6.4.0.8
Affected: 6.4.0.9
Affected: 6.4.0.10
Affected: 6.4.0.11
Affected: 6.4.0.12
Affected: 6.4.0.13
Affected: 6.4.0.14
Affected: 6.4.0.15
Affected: 6.4.0.16
Affected: 6.4.0.17
Affected: 6.4.0.18
Affected: 7.0.0
Affected: 7.0.0.1
Affected: 7.0.1
Affected: 7.0.1.1
Affected: 7.0.2
Affected: 7.0.2.1
Affected: 7.0.3
Affected: 7.0.4
Affected: 7.0.5
Affected: 7.0.6
Affected: 7.0.6.1
Affected: 7.0.6.2
Affected: 7.0.6.3
Affected: 7.0.7
Affected: 7.0.8
Affected: 7.1.0
Affected: 7.1.0.1
Affected: 7.1.0.2
Affected: 7.1.0.3
Affected: 7.2.0
Affected: 7.2.0.1
Affected: 7.2.1
Affected: 7.2.2
Affected: 7.2.3
Affected: 7.2.4
Affected: 7.2.4.1
Affected: 7.2.5
Affected: 7.2.5.1
Affected: 7.2.6
Affected: 7.2.7
Affected: 7.2.5.2
Affected: 7.2.8
Affected: 7.2.8.1
Affected: 7.3.0
Affected: 7.3.1
Affected: 7.3.1.1
Affected: 7.3.1.2
Affected: 7.4.0
Affected: 7.4.1
Affected: 7.4.1.1
Affected: 7.4.2
Affected: 7.4.2.1
Affected: 7.4.2.2
Affected: 7.4.2.3
Affected: 7.6.0
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CISA KEV
Known Exploited Vulnerability - GCVE BCP-07 Compliant

Vulnerability ID: CVE-2025-20333

Status: Confirmed

Status Updated: 2025-09-25 00:00 UTC

Exploited: Yes


Timestamps
First Seen: 2025-09-25
Asserted: 2025-09-25

Scope
Notes: KEV entry: Cisco Secure Firewall Adaptive Security Appliance (ASA) and Secure Firewall Threat Defense (FTD) Buffer Overflow Vulnerability | Affected: Cisco / Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense | Description: Cisco Secure Firewall Adaptive Security (ASA) Appliance and Secure Firewall Threat Defense (FTD) Software VPN Web Server contain a buffer overflow vulnerability that allows for remote code execution. This vulnerability could be chained with CVE-2025-20362. | Required action: The KEV due date refers to the deadline by which FCEB agencies are expected to review and begin implementing the guidance outlined in Emergency Directive (ED) 25-03 (URL listed below in Notes). Agencies must follow the mitigation steps provided by CISA (URL listed below in Notes) and vendor’s instructions (URL listed below in Notes). Adhere to the applicable BOD 22-01 guidance for cloud services or discontinue use of the product if mitigations are not available. | Due date: 2025-09-26 | Known ransomware campaign use (KEV): Unknown | Notes (KEV): CISA Mitigation Instructions: https://www.cisa.gov/news-events/directives/ed-25-03-identify-and-mitigate-potential-compromise-cisco-devices ; https://www.cisa.gov/news-events/directives/supplemental-direction-ed-25-03-core-dump-and-hunt-instructions ; https://www.cisa.gov/eviction-strategies-tool/create-from-template ; https://sec.cloudapps.cisco.com/security/center/resources/asa_ftd_continued_attacks ; https://sec.cloudapps.cisco.com/security/center/private/resources/asa_ftd_continued_attacks#Details ; https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-webvpn-z5xP8EUB ; https://nvd.nist.gov/vuln/detail/CVE-2025-20333

Evidence

Type: Vendor Report

Signal: Successful Exploitation

Confidence: 80%

Source: cisa-kev


Details
Cwes CWE-120
Feed CISA Known Exploited Vulnerabilities Catalog
Product Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense
Due Date 2025-09-26
Date Added 2025-09-25
Vendorproject Cisco
Vulnerabilityname Cisco Secure Firewall Adaptive Security Appliance (ASA) and Secure Firewall Threat Defense (FTD) Buffer Overflow Vulnerability
Knownransomwarecampaignuse Unknown

References

Created: 2026-02-02 12:25 UTC | Updated: 2026-02-06 07:17 UTC
Show details on NVD website

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2025-20333",
                "options": [
                  {
                    "Exploitation": "active"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2025-09-26T03:55:14.003793Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          },
          {
            "other": {
              "content": {
                "dateAdded": "2025-09-25",
                "reference": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-20333"
              },
              "type": "kev"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2025-10-21T22:45:17.165Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "references": [
          {
            "tags": [
              "vendor-advisory"
            ],
            "url": "https://sec.cloudapps.cisco.com/security/center/resources/asa_ftd_continued_attacks"
          },
          {
            "tags": [
              "government-resource"
            ],
            "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-20333"
          }
        ],
        "timeline": [
          {
            "lang": "en",
            "time": "2025-09-25T00:00:00+00:00",
            "value": "CVE-2025-20333 added to CISA KEV"
          }
        ],
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "Cisco Secure Firewall Adaptive Security Appliance (ASA) Software",
          "vendor": "Cisco",
          "versions": [
            {
              "status": "affected",
              "version": "9.8.1"
            },
            {
              "status": "affected",
              "version": "9.8.1.5"
            },
            {
              "status": "affected",
              "version": "9.8.1.7"
            },
            {
              "status": "affected",
              "version": "9.8.2"
            },
            {
              "status": "affected",
              "version": "9.8.2.8"
            },
            {
              "status": "affected",
              "version": "9.8.2.14"
            },
            {
              "status": "affected",
              "version": "9.8.2.15"
            },
            {
              "status": "affected",
              "version": "9.8.2.17"
            },
            {
              "status": "affected",
              "version": "9.8.2.20"
            },
            {
              "status": "affected",
              "version": "9.8.2.24"
            },
            {
              "status": "affected",
              "version": "9.8.2.26"
            },
            {
              "status": "affected",
              "version": "9.8.2.28"
            },
            {
              "status": "affected",
              "version": "9.8.2.33"
            },
            {
              "status": "affected",
              "version": "9.8.2.35"
            },
            {
              "status": "affected",
              "version": "9.8.2.38"
            },
            {
              "status": "affected",
              "version": "9.8.3.8"
            },
            {
              "status": "affected",
              "version": "9.8.3.11"
            },
            {
              "status": "affected",
              "version": "9.8.3.14"
            },
            {
              "status": "affected",
              "version": "9.8.3.16"
            },
            {
              "status": "affected",
              "version": "9.8.3.18"
            },
            {
              "status": "affected",
              "version": "9.8.3.21"
            },
            {
              "status": "affected",
              "version": "9.8.3"
            },
            {
              "status": "affected",
              "version": "9.8.3.26"
            },
            {
              "status": "affected",
              "version": "9.8.3.29"
            },
            {
              "status": "affected",
              "version": "9.8.4"
            },
            {
              "status": "affected",
              "version": "9.8.4.3"
            },
            {
              "status": "affected",
              "version": "9.8.4.7"
            },
            {
              "status": "affected",
              "version": "9.8.4.8"
            },
            {
              "status": "affected",
              "version": "9.8.4.10"
            },
            {
              "status": "affected",
              "version": "9.8.4.12"
            },
            {
              "status": "affected",
              "version": "9.8.4.15"
            },
            {
              "status": "affected",
              "version": "9.8.4.17"
            },
            {
              "status": "affected",
              "version": "9.8.2.45"
            },
            {
              "status": "affected",
              "version": "9.8.4.25"
            },
            {
              "status": "affected",
              "version": "9.8.4.20"
            },
            {
              "status": "affected",
              "version": "9.8.4.22"
            },
            {
              "status": "affected",
              "version": "9.8.4.26"
            },
            {
              "status": "affected",
              "version": "9.8.4.29"
            },
            {
              "status": "affected",
              "version": "9.8.4.32"
            },
            {
              "status": "affected",
              "version": "9.8.4.33"
            },
            {
              "status": "affected",
              "version": "9.8.4.34"
            },
            {
              "status": "affected",
              "version": "9.8.4.35"
            },
            {
              "status": "affected",
              "version": "9.8.4.39"
            },
            {
              "status": "affected",
              "version": "9.8.4.40"
            },
            {
              "status": "affected",
              "version": "9.8.4.41"
            },
            {
              "status": "affected",
              "version": "9.8.4.43"
            },
            {
              "status": "affected",
              "version": "9.8.4.44"
            },
            {
              "status": "affected",
              "version": "9.8.4.45"
            },
            {
              "status": "affected",
              "version": "9.8.4.46"
            },
            {
              "status": "affected",
              "version": "9.8.4.48"
            },
            {
              "status": "affected",
              "version": "9.12.1"
            },
            {
              "status": "affected",
              "version": "9.12.1.2"
            },
            {
              "status": "affected",
              "version": "9.12.1.3"
            },
            {
              "status": "affected",
              "version": "9.12.2"
            },
            {
              "status": "affected",
              "version": "9.12.2.4"
            },
            {
              "status": "affected",
              "version": "9.12.2.5"
            },
            {
              "status": "affected",
              "version": "9.12.2.9"
            },
            {
              "status": "affected",
              "version": "9.12.3"
            },
            {
              "status": "affected",
              "version": "9.12.3.2"
            },
            {
              "status": "affected",
              "version": "9.12.3.7"
            },
            {
              "status": "affected",
              "version": "9.12.4"
            },
            {
              "status": "affected",
              "version": "9.12.3.12"
            },
            {
              "status": "affected",
              "version": "9.12.3.9"
            },
            {
              "status": "affected",
              "version": "9.12.2.1"
            },
            {
              "status": "affected",
              "version": "9.12.4.2"
            },
            {
              "status": "affected",
              "version": "9.12.4.4"
            },
            {
              "status": "affected",
              "version": "9.12.4.7"
            },
            {
              "status": "affected",
              "version": "9.12.4.10"
            },
            {
              "status": "affected",
              "version": "9.12.4.13"
            },
            {
              "status": "affected",
              "version": "9.12.4.8"
            },
            {
              "status": "affected",
              "version": "9.12.4.18"
            },
            {
              "status": "affected",
              "version": "9.12.4.24"
            },
            {
              "status": "affected",
              "version": "9.12.4.26"
            },
            {
              "status": "affected",
              "version": "9.12.4.29"
            },
            {
              "status": "affected",
              "version": "9.12.4.30"
            },
            {
              "status": "affected",
              "version": "9.12.4.35"
            },
            {
              "status": "affected",
              "version": "9.12.4.37"
            },
            {
              "status": "affected",
              "version": "9.12.4.38"
            },
            {
              "status": "affected",
              "version": "9.12.4.39"
            },
            {
              "status": "affected",
              "version": "9.12.4.40"
            },
            {
              "status": "affected",
              "version": "9.12.4.41"
            },
            {
              "status": "affected",
              "version": "9.12.4.47"
            },
            {
              "status": "affected",
              "version": "9.12.4.48"
            },
            {
              "status": "affected",
              "version": "9.12.4.50"
            },
            {
              "status": "affected",
              "version": "9.12.4.52"
            },
            {
              "status": "affected",
              "version": "9.12.4.54"
            },
            {
              "status": "affected",
              "version": "9.12.4.55"
            },
            {
              "status": "affected",
              "version": "9.12.4.56"
            },
            {
              "status": "affected",
              "version": "9.12.4.58"
            },
            {
              "status": "affected",
              "version": "9.12.4.62"
            },
            {
              "status": "affected",
              "version": "9.12.4.65"
            },
            {
              "status": "affected",
              "version": "9.12.4.67"
            },
            {
              "status": "affected",
              "version": "9.14.1"
            },
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              "status": "affected",
              "version": "7.3.1.2"
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              "status": "affected",
              "version": "7.4.0"
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              "status": "affected",
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "A vulnerability in the VPN web server of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an authenticated, remote attacker to execute arbitrary code on an affected device.\r\n\r This vulnerability is due to improper validation of user-supplied input in HTTP(S) requests. An attacker with valid VPN user credentials could exploit this vulnerability by sending crafted HTTP requests to an affected device. A successful exploit could allow the attacker to execute arbitrary code as root, possibly resulting in the complete compromise of the affected device."
        }
      ],
      "exploits": [
        {
          "lang": "en",
          "value": "The Cisco Product Security Incident Response Team (PSIRT) is aware of attempted exploitation of this vulnerability. Cisco continues to strongly recommend that customers upgrade to a fixed software release to remediate this vulnerability."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 9.9,
            "baseSeverity": "CRITICAL",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "CHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
            "version": "3.1"
          },
          "format": "cvssV3_1"
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-120",
              "description": "Buffer Copy without Checking Size of Input (\u0027Classic Buffer Overflow\u0027)",
              "lang": "en",
              "type": "cwe"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-11-05T21:03:29.299Z",
        "orgId": "d1c1063e-7a18-46af-9102-31f8928bc633",
        "shortName": "cisco"
      },
      "references": [
        {
          "name": "cisco-sa-asaftd-webvpn-z5xP8EUB",
          "url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-webvpn-z5xP8EUB"
        }
      ],
      "source": {
        "advisory": "cisco-sa-asaftd-webvpn-z5xP8EUB",
        "defects": [
          "CSCwq79831"
        ],
        "discovery": "EXTERNAL"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "d1c1063e-7a18-46af-9102-31f8928bc633",
    "assignerShortName": "cisco",
    "cveId": "CVE-2025-20333",
    "datePublished": "2025-09-25T16:12:14.308Z",
    "dateReserved": "2024-10-10T19:15:13.255Z",
    "dateUpdated": "2025-11-05T21:03:29.299Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "cisa_known_exploited": {
      "cveID": "CVE-2025-20333",
      "cwes": "[\"CWE-120\"]",
      "dateAdded": "2025-09-25",
      "dueDate": "2025-09-26",
      "knownRansomwareCampaignUse": "Unknown",
      "notes": "CISA Mitigation Instructions: https://www.cisa.gov/news-events/directives/ed-25-03-identify-and-mitigate-potential-compromise-cisco-devices ; https://www.cisa.gov/news-events/directives/supplemental-direction-ed-25-03-core-dump-and-hunt-instructions ; https://www.cisa.gov/eviction-strategies-tool/create-from-template ; https://sec.cloudapps.cisco.com/security/center/resources/asa_ftd_continued_attacks ;    https://sec.cloudapps.cisco.com/security/center/private/resources/asa_ftd_continued_attacks#Details ; https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-webvpn-z5xP8EUB ; https://nvd.nist.gov/vuln/detail/CVE-2025-20333",
      "product": "Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense",
      "requiredAction": "The KEV due date refers to the deadline by which FCEB agencies are expected to review and begin implementing the guidance outlined in Emergency Directive (ED) 25-03 (URL listed below in Notes). Agencies must follow the mitigation steps provided by CISA (URL listed below in Notes) and vendor\u2019s instructions (URL listed below in Notes). Adhere to the applicable BOD 22-01 guidance for cloud services or discontinue use of the product if mitigations are not available.",
      "shortDescription": "Cisco Secure Firewall Adaptive Security (ASA) Appliance and Secure Firewall Threat Defense (FTD) Software VPN Web Server contain a buffer overflow vulnerability that allows for remote code execution. This vulnerability could be chained with CVE-2025-20362.",
      "vendorProject": "Cisco",
      "vulnerabilityName": "Cisco Secure Firewall Adaptive Security Appliance (ASA) and Secure Firewall Threat Defense (FTD) Buffer Overflow Vulnerability"
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\"6.4.0.17\"}, {\"status\": \"affected\", \"version\": \"6.4.0.18\"}, {\"status\": \"affected\", \"version\": \"7.0.0\"}, {\"status\": \"affected\", \"version\": \"7.0.0.1\"}, {\"status\": \"affected\", \"version\": \"7.0.1\"}, {\"status\": \"affected\", \"version\": \"7.0.1.1\"}, {\"status\": \"affected\", \"version\": \"7.0.2\"}, {\"status\": \"affected\", \"version\": \"7.0.2.1\"}, {\"status\": \"affected\", \"version\": \"7.0.3\"}, {\"status\": \"affected\", \"version\": \"7.0.4\"}, {\"status\": \"affected\", \"version\": \"7.0.5\"}, {\"status\": \"affected\", \"version\": \"7.0.6\"}, {\"status\": \"affected\", \"version\": \"7.0.6.1\"}, {\"status\": \"affected\", \"version\": \"7.0.6.2\"}, {\"status\": \"affected\", \"version\": \"7.0.6.3\"}, {\"status\": \"affected\", \"version\": \"7.0.7\"}, {\"status\": \"affected\", \"version\": \"7.0.8\"}, {\"status\": \"affected\", \"version\": \"7.1.0\"}, {\"status\": \"affected\", \"version\": \"7.1.0.1\"}, {\"status\": \"affected\", \"version\": \"7.1.0.2\"}, {\"status\": \"affected\", \"version\": \"7.1.0.3\"}, {\"status\": \"affected\", \"version\": \"7.2.0\"}, {\"status\": \"affected\", \"version\": \"7.2.0.1\"}, {\"status\": \"affected\", \"version\": \"7.2.1\"}, {\"status\": \"affected\", \"version\": \"7.2.2\"}, {\"status\": \"affected\", \"version\": \"7.2.3\"}, {\"status\": \"affected\", \"version\": \"7.2.4\"}, {\"status\": \"affected\", \"version\": \"7.2.4.1\"}, {\"status\": \"affected\", \"version\": \"7.2.5\"}, {\"status\": \"affected\", \"version\": \"7.2.5.1\"}, {\"status\": \"affected\", \"version\": \"7.2.6\"}, {\"status\": \"affected\", \"version\": \"7.2.7\"}, {\"status\": \"affected\", \"version\": \"7.2.5.2\"}, {\"status\": \"affected\", \"version\": \"7.2.8\"}, {\"status\": \"affected\", \"version\": \"7.2.8.1\"}, {\"status\": \"affected\", \"version\": \"7.3.0\"}, {\"status\": \"affected\", \"version\": \"7.3.1\"}, {\"status\": \"affected\", \"version\": \"7.3.1.1\"}, {\"status\": \"affected\", \"version\": \"7.3.1.2\"}, {\"status\": \"affected\", \"version\": \"7.4.0\"}, {\"status\": \"affected\", \"version\": \"7.4.1\"}, {\"status\": \"affected\", \"version\": \"7.4.1.1\"}, {\"status\": \"affected\", \"version\": \"7.4.2\"}, {\"status\": \"affected\", \"version\": \"7.4.2.1\"}, {\"status\": \"affected\", \"version\": \"7.4.2.2\"}, {\"status\": \"affected\", \"version\": \"7.4.2.3\"}, {\"status\": \"affected\", \"version\": \"7.6.0\"}]}], \"exploits\": [{\"lang\": \"en\", \"value\": \"The Cisco Product Security Incident Response Team (PSIRT) is aware of attempted exploitation of this vulnerability. Cisco continues to strongly recommend that customers upgrade to a fixed software release to remediate this vulnerability.\"}], \"references\": [{\"url\": \"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-webvpn-z5xP8EUB\", \"name\": \"cisco-sa-asaftd-webvpn-z5xP8EUB\"}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"A vulnerability in the VPN web server of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an authenticated, remote attacker to execute arbitrary code on an affected device.\\r\\n\\r This vulnerability is due to improper validation of user-supplied input in HTTP(S) requests. An attacker with valid VPN user credentials could exploit this vulnerability by sending crafted HTTP requests to an affected device. A successful exploit could allow the attacker to execute arbitrary code as root, possibly resulting in the complete compromise of the affected device.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"cwe\", \"cweId\": \"CWE-120\", \"description\": \"Buffer Copy without Checking Size of Input (\u0027Classic Buffer Overflow\u0027)\"}]}], \"providerMetadata\": {\"orgId\": \"d1c1063e-7a18-46af-9102-31f8928bc633\", \"shortName\": \"cisco\", \"dateUpdated\": \"2025-11-05T21:03:29.299Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2025-20333\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-11-05T21:03:29.299Z\", \"dateReserved\": \"2024-10-10T19:15:13.255Z\", \"assignerOrgId\": \"d1c1063e-7a18-46af-9102-31f8928bc633\", \"datePublished\": \"2025-09-25T16:12:14.308Z\", \"assignerShortName\": \"cisco\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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Sightings

Author Source Type Date

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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Detection rules are retrieved from Rulezet.

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