{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-20349","assignerOrgId":"d1c1063e-7a18-46af-9102-31f8928bc633","state":"PUBLISHED","assignerShortName":"cisco","dateReserved":"2025-10-08T11:59:15.413Z","datePublished":"2026-08-11T17:06:03.091Z","dateUpdated":"2026-08-12T04:00:28.075Z"},"containers":{"cna":{"title":"Cisco Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense Software Remote Access SSL VPN Denial of Service Vulnerability","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"}}],"descriptions":[{"lang":"en","value":"A vulnerability in the Remote Access SSL VPN service 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 the device to reload unexpectedly, resulting in a denial of service (DoS) condition. \r\n\r\nThis vulnerability is due to insufficient error checking when processing HTTP requests. An attacker could exploit this vulnerability by sending a crafted HTTP request to the Remote Access SSL VPN service on an affected device. A successful exploit could allow the attacker to cause the affected device to reload, resulting in a DoS condition."}],"references":[{"url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-vpn-dos-dzv4mQFF","name":"cisco-sa-asaftd-vpn-dos-dzv4mQFF"}],"exploits":[{"lang":"en","value":"In August 2026, the Cisco Product Security Incident Response Team (PSIRT) became aware of active exploitation of this vulnerability. Cisco strongly recommends that customers upgrade to a fixed software release to remediate this vulnerability."}],"source":{"advisory":"cisco-sa-asaftd-vpn-dos-dzv4mQFF","discovery":"EXTERNAL","defects":["CSCwv96220"]},"problemTypes":[{"descriptions":[{"lang":"en","description":"Improper Clearing of Heap Memory Before Release ('Heap Inspection')","type":"cwe","cweId":"CWE-244"}]}],"affected":[{"vendor":"Cisco","product":"Cisco Secure Firewall Adaptive Security Appliance (ASA) Software","versions":[{"version":"9.16.1","status":"affected"},{"version":"9.16.1.28","status":"affected"},{"version":"9.16.2","status":"affected"},{"version":"9.16.2.3","status":"affected"},{"version":"9.16.2.7","status":"affected"},{"version":"9.16.2.11","status":"affected"},{"version":"9.16.2.13","status":"affected"},{"version":"9.16.2.14","status":"affected"},{"version":"9.16.3.3","status":"affected"},{"version":"9.16.3","status":"affected"},{"version":"9.16.3.14","status":"affected"},{"version":"9.18.1","status":"affected"},{"version":"9.16.3.15","status":"affected"},{"version":"9.18.1.3","status":"affected"},{"version":"9.18.2","status":"affected"},{"version":"9.16.3.19","status":"affected"},{"version":"9.16.3.23","status":"affected"},{"version":"9.18.2.5","status":"affected"},{"version":"9.16.4","status":"affected"},{"version":"9.18.2.7","status":"affected"},{"version":"9.19.1","status":"affected"},{"version":"9.16.4.9","status":"affected"},{"version":"9.18.2.8","status":"affected"},{"version":"9.16.4.14","status":"affected"},{"version":"9.18.3","status":"affected"},{"version":"9.19.1.5","status":"affected"},{"version":"9.19.1.9","status":"affected"},{"version":"9.18.3.39","status":"affected"},{"version":"9.16.4.19","status":"affected"},{"version":"9.19.1.12","status":"affected"},{"version":"9.18.3.46","status":"affected"},{"version":"9.16.4.27","status":"affected"},{"version":"9.19.1.18","status":"affected"},{"version":"9.18.3.53","status":"affected"},{"version":"9.18.3.55","status":"affected"},{"version":"9.16.4.38","status":"affected"},{"version":"9.16.4.39","status":"affected"},{"version":"9.18.3.56","status":"affected"},{"version":"9.20.1","status":"affected"},{"version":"9.16.4.42","status":"affected"},{"version":"9.19.1.22","status":"affected"},{"version":"9.18.4","status":"affected"},{"version":"9.20.1.5","status":"affected"},{"version":"9.18.4.5","status":"affected"},{"version":"9.19.1.24","status":"affected"},{"version":"9.16.4.48","status":"affected"},{"version":"9.18.4.8","status":"affected"},{"version":"9.20.2","status":"affected"},{"version":"9.19.1.27","status":"affected"},{"version":"9.16.4.55","status":"affected"},{"version":"9.18.4.22","status":"affected"},{"version":"9.20.2.10","status":"affected"},{"version":"9.16.4.57","status":"affected"},{"version":"9.19.1.28","status":"affected"},{"version":"9.18.4.24","status":"affected"},{"version":"9.20.2.21","status":"affected"},{"version":"9.16.4.61","status":"affected"},{"version":"9.19.1.31","status":"affected"},{"version":"9.18.4.29","status":"affected"},{"version":"9.20.2.22","status":"affected"},{"version":"9.16.4.62","status":"affected"},{"version":"9.18.4.34","status":"affected"},{"version":"9.20.3","status":"affected"},{"version":"9.16.4.67","status":"affected"},{"version":"9.16.4.70","status":"affected"},{"version":"9.18.4.40","status":"affected"},{"version":"9.23.1","status":"affected"},{"version":"9.22.1.1","status":"affected"},{"version":"9.16.4.71","status":"affected"},{"version":"9.20.3.4","status":"affected"},{"version":"9.18.4.47","status":"affected"},{"version":"9.20.3.7","status":"affected"},{"version":"9.19.1.37","status":"affected"},{"version":"9.16.4.76","status":"affected"},{"version":"9.20.3.9","status":"affected"},{"version":"9.19.1.38","status":"affected"},{"version":"9.18.4.50","status":"affected"},{"version":"9.22.1.3","status":"affected"},{"version":"9.20.3.10","status":"affected"},{"version":"9.22.1.2","status":"affected"},{"version":"9.18.4.52","status":"affected"},{"version":"9.20.3.13","status":"affected"},{"version":"9.22.1.6","status":"affected"},{"version":"9.18.4.53","status":"affected"},{"version":"9.16.4.82","status":"affected"},{"version":"9.22.2","status":"affected"},{"version":"9.20.3.16","status":"affected"},{"version":"9.19.1.42","status":"affected"},{"version":"9.18.4.57","status":"affected"},{"version":"9.16.4.84","status":"affected"},{"version":"9.23.1.3","status":"affected"},{"version":"9.20.3.20","status":"affected"},{"version":"9.22.2.4","status":"affected"},{"version":"9.23.1.7","status":"affected"},{"version":"9.20.4","status":"affected"},{"version":"9.22.2.9","status":"affected"},{"version":"9.23.1.13","status":"affected"},{"version":"9.20.4.7","status":"affected"},{"version":"9.22.2.13","status":"affected"},{"version":"9.18.4.66","status":"affected"},{"version":"9.20.4.10","status":"affected"},{"version":"9.23.1.19","status":"affected"},{"version":"9.16.4.85","status":"affected"},{"version":"9.22.2.14","status":"affected"},{"version":"9.18.4.67","status":"affected"},{"version":"9.24.1","status":"affected"},{"version":"9.18.4.68","status":"affected"},{"version":"9.23.1.22","status":"affected"},{"version":"9.20.4.14","status":"affected"},{"version":"9.22.2.20","status":"affected"},{"version":"9.18.4.71","status":"affected"},{"version":"9.20.4.19","status":"affected"},{"version":"9.23.1.26","status":"affected"},{"version":"9.16.4.89","status":"affected"},{"version":"9.22.2.32","status":"af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Secure Firewall Threat Defense (FTD) 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Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3","id":"CVE-2026-20349"}}},{"other":{"type":"kev","content":{"dateAdded":"2026-08-11","reference":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-20349"}}}],"references":[{"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-20349","tags":["government-resource"]}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-08-12T04:00:28.075Z"},"timeline":[{"time":"2026-08-11T00:00:00.000Z","lang":"en","value":"CVE-2026-20349 added to CISA KEV"}]}]}}