{"api_version":"1","generated_at":"2026-09-17T07:49:38+00:00","cve":"CVE-2026-20331","urls":{"html":"https://cve.report/CVE-2026-20331","api":"https://cve.report/api/cve/CVE-2026-20331.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-20331","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-20331"},"summary":{"title":"Cisco Secure Adaptive Security Appliance Software, Secure Firewall Threat Defense Software and Secure Firewall Management Center Software Hardening Release - Protection Mechanism Failure Vulnerabilities","description":"As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco Secure Adaptive Security Appliance Software, Cisco Secure Firewall Threat Defense Software and Cisco Secure Firewall Management Center Software engineering team has conducted a comprehensive internal security review. This review resulted in a software hardening release that addresses multiple internally discovered vulnerabilities.  \r\n\r\nThe vulnerabilities tracked by CVE-2026-20331 are related to the failure of protection mechanisms issues that are grouped under the Common Weakness Enumeration (CWE) Pillar CWE-693.","state":"PUBLISHED","assigner":"cisco","published_at":"2026-09-16 17:17:17","updated_at":"2026-09-17 04:17:41"},"problem_types":["CWE-693","CWE-693 Protection Mechanism 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Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-20331","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Cisco","product":"Cisco Secure Firewall Adaptive Security Appliance (ASA) Software","version":"affected 9.16.1","platforms":[]},{"source":"CNA","vendor":"Cisco","product":"Cisco Secure Firewall Adaptive Security Appliance (ASA) Software","version":"affected 9.16.1.28","platforms":[]},{"source":"CNA","vendor":"Cisco","product":"Cisco Secure Firewall Adaptive Security Appliance (ASA) Software","version":"affected 9.16.2","platforms":[]},{"source":"CNA","vendor":"Cisco","product":"Cisco Secure Firewall Adaptive Security Appliance (ASA) Software","version":"affected 9.16.2.3","platforms":[]},{"source":"CNA","vendor":"Cisco","product":"Cisco Secure Firewall Adaptive Security Appliance (ASA) Software","version":"affected 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part of Cisco's ongoing commitment to proactive security and product quality, the Cisco Secure Adaptive Security Appliance Software, Cisco Secure Firewall Threat Defense Software and Cisco Secure Firewall Management Center Software engineering team has conducted a comprehensive internal security review. This review resulted in a software hardening release that addresses multiple internally discovered vulnerabilities.  \r\n\r\nThe vulnerabilities tracked by CVE-2026-20331 are related to the failure of protection mechanisms issues that are grouped under the Common Weakness Enumeration (CWE) Pillar CWE-693."}],"exploits":[{"lang":"en","value":"Except as otherwise noted previously, the Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerabilities that are described in this advisory."}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"ADJACENT_NETWORK","availabilityImpact":"LOW","baseScore":9.6,"baseSeverity":"CRITICAL","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"CHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:L","version":"3.1"},"format":"cvssV3_1"}],"problemTypes":[{"descriptions":[{"cweId":"CWE-693","description":"Protection Mechanism Failure","lang":"en","type":"cwe"}]}],"providerMetadata":{"dateUpdated":"2026-09-16T20:05:55.134Z","orgId":"d1c1063e-7a18-46af-9102-31f8928bc633","shortName":"cisco"},"references":[{"name":"cisco-sa-hardening-asaftdfmc-uvpPROhN","url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-hardening-asaftdfmc-uvpPROhN"}],"source":{"advisory":"cisco-sa-hardening-asaftdfmc-uvpPROhN","defects":["CSCwu12555"],"discovery":"INTERNAL"},"title":"Cisco Secure Adaptive Security Appliance Software, Secure Firewall Threat Defense Software and Secure Firewall Management Center Software Hardening Release - Protection Mechanism Failure Vulnerabilities"}},"cveMetadata":{"assignerOrgId":"d1c1063e-7a18-46af-9102-31f8928bc633","assignerShortName":"cisco","cveId":"CVE-2026-20331","datePublished":"2026-09-16T16:56:18.183Z","dateReserved":"2025-10-08T11:59:15.412Z","dateUpdated":"2026-09-17T03:57:25.687Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-09-16 17:17:17","lastModifiedDate":"2026-09-17 04:17:41","problem_types":["CWE-693","CWE-693 Protection Mechanism Failure"],"metrics":{"cvssMetricV31":[{"source":"psirt@cisco.com","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:L","baseScore":9.6,"baseSeverity":"CRITICAL","attackVector":"ADJACENT_NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"CHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"LOW"},"exploitabilityScore":2.8,"impactScore":6}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2026-09-16T00:00:00+00:00","id":"CVE-2026-20331","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"20331","Ordinal":"1","Title":"Cisco Secure Adaptive Security Appliance Software, Secure Firewa","CVE":"CVE-2026-20331","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"20331","Ordinal":"1","NoteData":"As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco Secure Adaptive Security Appliance Software, Cisco Secure Firewall Threat Defense Software and Cisco Secure Firewall Management Center Software engineering team has conducted a comprehensive internal security review. This review resulted in a software hardening release that addresses multiple internally discovered vulnerabilities.  \r\n\r\nThe vulnerabilities tracked by CVE-2026-20331 are related to the failure of protection mechanisms issues that are grouped under the Common Weakness Enumeration (CWE) Pillar CWE-693.","Type":"Description","Title":"Cisco Secure Adaptive Security Appliance Software, Secure Firewa"}]}}}