{"id":"CVE-2025-20134","state":"PUBLISHED","title":"Cisco Adaptive Security Appliance and Firepower Threat Defense Software SSL/TLS Certificate Denial of Service Vulnerability","description":"A vulnerability in the certificate processing of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause the device to reload unexpectedly, resulting in a denial of service (DoS) condition.\r\n\r\nThis vulnerability is due to improper parsing of SSL/TLS certificates. An attacker could exploit this vulnerability by sending crafted DNS packets that match a static Network Address Translation (NAT) rule with DNS inspection enabled through an affected device. A successful exploit could allow the attacker to cause the device to reload, resulting in a DoS condition.","publishedAt":"2025-08-14T16:28:07.782Z","updatedAt":"2025-08-19T21:41:44.731Z","severity":{"score":8.6,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H","source":"cisco"},"assigner":"cisco","products":["Cisco Cisco Adaptive Security Appliance (ASA) Software","Cisco Cisco Firepower Threat Defense Software"],"affected":[{"vendor":"Cisco","product":"Cisco Adaptive Security Appliance (ASA) Software","defaultStatus":"unknown","versions":[{"version":"9.12.4.39","status":"affected"},{"version":"9.12.4.40","status":"affected"},{"version":"9.14.4.6","status":"affected"},{"version":"9.14.4.7","status":"affected"},{"version":"9.12.4.41","status":"affected"},{"version":"9.12.4.47","status":"affected"},{"version":"9.14.4.12","status":"affected"},{"version":"9.12.4.48","status":"affected"},{"version":"9.14.4.13","status":"affected"},{"version":"9.12.4.50","status":"affected"},{"version":"9.14.4.14","status":"affected"},{"version":"9.12.4.52","status":"affected"},{"version":"9.14.4.15","status":"affected"},{"version":"9.12.4.54","status":"affected"},{"version":"9.14.4.17","status":"affected"},{"version":"9.12.4.55","status":"affected"},{"version":"9.14.4.22","status":"affected"},{"version":"9.14.4.23","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":"9.14.4.24","status":"affected"}]},{"vendor":"Cisco","product":"Cisco Firepower Threat Defense Software","defaultStatus":"unknown","versions":[{"version":"6.6.5.2","status":"affected"},{"version":"6.4.0.15","status":"affected"},{"version":"6.6.7","status":"affected"},{"version":"6.4.0.16","status":"affected"},{"version":"6.6.7.1","status":"affected"},{"version":"6.4.0.17","status":"affected"},{"version":"6.6.7.2","status":"affected"},{"version":"6.4.0.18","status":"affected"}]}],"references":["https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-ssltls-dos-eHw76vZe"],"weaknesses":["CWE-415"],"ingestedAt":"2026-10-29T20:08:39.238Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2025/20xxx/CVE-2025-20134.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.1","cveMetadata":{"cveId":"CVE-2025-20134","state":"PUBLISHED","datePublished":"2025-08-14T16:28:07.782Z","dateUpdated":"2025-08-19T21:41:44.731Z","assignerShortName":"cisco","assignerOrgId":"d1c1063e-7a18-46af-9102-31f8928bc633","dateReserved":"2024-10-10T19:15:13.212Z"},"containers":{"cna":{"title":"Cisco Adaptive Security Appliance and Firepower Threat Defense Software SSL/TLS Certificate Denial of Service Vulnerability","descriptions":[{"lang":"en","value":"A vulnerability in the certificate processing of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause the device to reload unexpectedly, resulting in a denial of service (DoS) condition.\r\n\r\nThis vulnerability is due to improper parsing of SSL/TLS certificates. An attacker could exploit this vulnerability by sending crafted DNS packets that match a static Network Address Translation (NAT) rule with DNS inspection enabled through an affected device. A successful exploit could allow the attacker to cause the device to reload, resulting in a DoS condition."}],"affected":[{"vendor":"Cisco","product":"Cisco Adaptive Security Appliance (ASA) Software","defaultStatus":"unknown","versions":[{"version":"9.12.4.39","status":"affected"},{"version":"9.12.4.40","status":"affected"},{"version":"9.14.4.6","status":"affected"},{"version":"9.14.4.7","status":"affected"},{"version":"9.12.4.41","status":"affected"},{"version":"9.12.4.47","status":"affected"},{"version":"9.14.4.12","status":"affected"},{"version":"9.12.4.48","status":"affected"},{"version":"9.14.4.13","status":"affected"},{"version":"9.12.4.50","status":"affected"},{"version":"9.14.4.14","status":"affected"},{"version":"9.12.4.52","status":"affected"},{"version":"9.14.4.15","status":"affected"},{"version":"9.12.4.54","status":"affected"},{"version":"9.14.4.17","status":"affected"},{"version":"9.12.4.55","status":"affected"},{"version":"9.14.4.22","status":"affected"},{"version":"9.14.4.23","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":"9.14.4.24","status":"affected"}]},{"vendor":"Cisco","product":"Cisco Firepower Threat Defense Software","defaultStatus":"unknown","versions":[{"version":"6.6.5.2","status":"affected"},{"version":"6.4.0.15","status":"affected"},{"version":"6.6.7","status":"affected"},{"version":"6.4.0.16","status":"affected"},{"version":"6.6.7.1","status":"affected"},{"version":"6.4.0.17","status":"affected"},{"version":"6.6.7.2","status":"affected"},{"version":"6.4.0.18","status":"affected"}]}],"references":[{"url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-ssltls-dos-eHw76vZe","name":"cisco-sa-asaftd-ssltls-dos-eHw76vZe"}],"metrics":[{"format":"cvssV3_1","cvssV3_1":{"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"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-415","lang":"en","description":"Double Free","type":"cwe"}]}],"providerMetadata":{"shortName":"cisco","orgId":"d1c1063e-7a18-46af-9102-31f8928bc633","dateUpdated":"2025-08-19T21:41:44.731Z"},"exploits":[{"lang":"en","value":"The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory."}],"source":{"advisory":"cisco-sa-asaftd-ssltls-dos-eHw76vZe","discovery":"INTERNAL","defects":["CSCwk44159"]}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2025-08-14T18:42:13.832362Z","id":"CVE-2025-20134","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2025-08-14T19:21:52.387Z"}}]}}}