{"api_version":"1","generated_at":"2026-04-17T09:18:07+00:00","cve":"CVE-2026-20039","urls":{"html":"https://cve.report/CVE-2026-20039","api":"https://cve.report/api/cve/CVE-2026-20039.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-20039","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-20039"},"summary":{"title":"Cisco Adaptive Security Appliance and Firepower Threat Defense Software SSL VPN Authentication Denial of Service Vulnerability","description":"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 unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device.\r\n\r\nThis vulnerability is due to ineffective memory management of the VPN web server. An attacker could exploit this vulnerability by sending a large number of crafted HTTP requests to an affected device. A successful exploit could allow the attacker to cause the device to reload, resulting in a DoS condition.","state":"PUBLISHED","assigner":"cisco","published_at":"2026-03-04 18:16:17","updated_at":"2026-04-16 20:01:23"},"problem_types":["CWE-244","CWE-244 Improper Clearing of Heap Memory Before Release ('Heap Inspection')"],"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-vpn-dos-SpOFF2Re","name":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-vpn-dos-SpOFF2Re","refsource":"psirt@cisco.com","tags":["Vendor Advisory"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-20039","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-20039","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 9.12.3","platforms":[]},{"source":"CNA","vendor":"Cisco","product":"Cisco Secure Firewall Adaptive Security Appliance (ASA) Software","version":"affected 9.12.1","platforms":[]},{"source":"CNA","vendor":"Cisco","product":"Cisco Secure Firewall Adaptive Security Appliance (ASA) Software","version":"affected 9.12.2","platforms":[]},{"source":"CNA","vendor":"Cisco","product":"Cisco Secure Firewall Adaptive Security Appliance (ASA) Software","version":"affected 9.12.4","platforms":[]},{"source":"CNA","vendor":"Cisco","product":"Cisco Secure Firewall Adaptive Security Appliance (ASA) Software","version":"affected 9.12.3.2","platforms":[]},{"source":"CNA","vendor":"Cisco","product":"Cisco Secure Firewall Adaptive Security Appliance (ASA) Software","version":"affected 9.12.3.7","platforms":[]},{"source":"CNA","vendor":"Cisco","product":"Cisco Secure Firewall Adaptive Security Appliance (ASA) Software","version":"affected 9.12.2.5","platforms":[]},{"source":"CNA","vendor":"Cisco","product":"Cisco Secure Firewall Adaptive Security Appliance (ASA) Software","version":"affected 9.12.3.12","platforms":[]},{"source":"CNA","vendor":"Cisco","product":"Cisco Secure Firewall Adaptive Security Appliance (ASA) Software","version":"affected 9.12.1.3","platforms":[]},{"source":"CNA","vendor":"Cisco","product":"Cisco Secure Firewall Adaptive Security Appliance (ASA) Software","version":"affected 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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 unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device.\r\n\r\nThis vulnerability is due to ineffective memory management of the VPN web server. An attacker could exploit this vulnerability by sending a large number of crafted HTTP requests to an affected device. A successful exploit could allow the attacker to cause the device to reload, resulting in a DoS condition."}],"exploits":[{"lang":"en","value":"The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory."}],"metrics":[{"cvssV3_1":{"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"},"format":"cvssV3_1"}],"problemTypes":[{"descriptions":[{"cweId":"CWE-244","description":"Improper Clearing of Heap Memory Before Release ('Heap 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Adaptive Security Appliance and Firepower Threat Defense S","CVE":"CVE-2026-20039","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"20039","Ordinal":"1","NoteData":"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 unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device.\r\n\r\nThis vulnerability is due to ineffective memory management of the VPN web server. An attacker could exploit this vulnerability by sending a large number of crafted HTTP requests to an affected device. A successful exploit could allow the attacker to cause the device to reload, resulting in a DoS condition.","Type":"Description","Title":"Cisco Adaptive Security Appliance and Firepower Threat Defense S"}]}}}