{"api_version":"1","generated_at":"2026-09-17T07:21:22+00:00","cve":"CVE-2026-20249","urls":{"html":"https://cve.report/CVE-2026-20249","api":"https://cve.report/api/cve/CVE-2026-20249.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-20249","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-20249"},"summary":{"title":"Cisco Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense Software IKEv2 Certificate Authentication Denial of Service Vulnerability","description":"A vulnerability in the certification authentication feature of Internet Key Exchange version 2 (IKEv2) for Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause an affected device to reload unexpectedly.\r\n\r\nThis vulnerability is due to a logic error during the certificate authentication phase of the IKEv2 connection setup. An attacker could exploit this vulnerability by attempting to establish an IKEv2 VPN connection with a crafted certificate. A successful exploit could allow the attacker to cause the IKEv2 process to crash, causing a denial of service (DoS) condition.","state":"PUBLISHED","assigner":"cisco","published_at":"2026-09-16 21:17:08","updated_at":"2026-09-16 21:17:08"},"problem_types":["CWE-704","CWE-704 Incorrect Type Conversion or Cast"],"metrics":[{"version":"3.1","source":"psirt@cisco.com","type":"Primary","score":"8.6","severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H","baseScore":8.6,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"CHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH"}},{"version":"3.1","source":"CNA","type":"CVSSV3_1","score":"8.6","severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H","data":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":8.6,"baseSeverity":"HIGH","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"CHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H","version":"3.1"}}],"references":[{"url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-ikev2cert-dos-uWyc2xtv","name":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-ikev2cert-dos-uWyc2xtv","refsource":"psirt@cisco.com","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-20249","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-20249","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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An attacker could exploit this vulnerability by attempting to establish an IKEv2 VPN connection with a crafted certificate. 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