--- id: CVE-2026-76418 title: >- Cisco Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense Software Remote Access SSL VPN Tunnel Denial of Service Vulnerability summary: >- A vulnerability in the Remote Access SSL VPN service 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… severity: high cvss: 8.6 cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H' cvssSource: cna cwe: - CWE-690 vendor: Cisco product: Cisco Secure Firewall Adaptive Security Appliance (ASA) Software affected: - secure_firewall_adaptive_security_appliance_asa_software 9.16.1 - secure_firewall_adaptive_security_appliance_asa_software 9.16.1.28 - secure_firewall_adaptive_security_appliance_asa_software 9.16.2 - secure_firewall_adaptive_security_appliance_asa_software 9.16.2.3 - secure_firewall_adaptive_security_appliance_asa_software 9.16.2.7 - secure_firewall_adaptive_security_appliance_asa_software 9.16.2.11 - secure_firewall_adaptive_security_appliance_asa_software 9.16.2.13 - secure_firewall_adaptive_security_appliance_asa_software 9.16.2.14 - secure_firewall_adaptive_security_appliance_asa_software 9.16.3.3 - secure_firewall_adaptive_security_appliance_asa_software 9.16.3 - secure_firewall_adaptive_security_appliance_asa_software 9.16.3.14 - secure_firewall_adaptive_security_appliance_asa_software 9.18.1 - secure_firewall_adaptive_security_appliance_asa_software 9.16.3.15 - secure_firewall_adaptive_security_appliance_asa_software 9.18.1.3 - secure_firewall_adaptive_security_appliance_asa_software 9.18.2 - secure_firewall_adaptive_security_appliance_asa_software 9.16.3.19 - secure_firewall_adaptive_security_appliance_asa_software 9.16.3.23 - secure_firewall_adaptive_security_appliance_asa_software 9.18.2.5 - secure_firewall_adaptive_security_appliance_asa_software 9.16.4 - secure_firewall_adaptive_security_appliance_asa_software 9.18.2.7 - secure_firewall_adaptive_security_appliance_asa_software 9.19.1 - secure_firewall_adaptive_security_appliance_asa_software 9.16.4.9 - secure_firewall_adaptive_security_appliance_asa_software 9.18.2.8 - secure_firewall_adaptive_security_appliance_asa_software 9.16.4.14 - secure_firewall_adaptive_security_appliance_asa_software 9.18.3 - secure_firewall_adaptive_security_appliance_asa_software 9.19.1.5 - secure_firewall_adaptive_security_appliance_asa_software 9.16.4.18 - secure_firewall_adaptive_security_appliance_asa_software 9.19.1.9 - secure_firewall_adaptive_security_appliance_asa_software 9.18.3.39 - secure_firewall_adaptive_security_appliance_asa_software 9.16.4.19 - secure_firewall_adaptive_security_appliance_asa_software 9.19.1.12 - secure_firewall_adaptive_security_appliance_asa_software 9.18.3.46 - secure_firewall_adaptive_security_appliance_asa_software 9.16.4.27 - secure_firewall_adaptive_security_appliance_asa_software 9.19.1.18 - secure_firewall_adaptive_security_appliance_asa_software 9.18.3.53 - secure_firewall_adaptive_security_appliance_asa_software 9.18.3.55 - secure_firewall_adaptive_security_appliance_asa_software 9.16.4.38 - secure_firewall_adaptive_security_appliance_asa_software 9.16.4.39 - secure_firewall_adaptive_security_appliance_asa_software 9.18.3.56 - secure_firewall_adaptive_security_appliance_asa_software 9.20.1 - secure_firewall_adaptive_security_appliance_asa_software 9.16.4.42 - secure_firewall_adaptive_security_appliance_asa_software 9.19.1.22 - secure_firewall_adaptive_security_appliance_asa_software 9.18.4 - secure_firewall_adaptive_security_appliance_asa_software 9.20.1.5 - secure_firewall_adaptive_security_appliance_asa_software 9.18.4.5 - secure_firewall_adaptive_security_appliance_asa_software 9.19.1.24 - secure_firewall_adaptive_security_appliance_asa_software 9.16.4.48 - secure_firewall_adaptive_security_appliance_asa_software 9.18.4.8 - secure_firewall_adaptive_security_appliance_asa_software 9.20.2 - secure_firewall_adaptive_security_appliance_asa_software 9.19.1.27 ssvc: exploitation: active automatable: 'yes' technicalImpact: partial timestamp: '2026-10-28T00:00:00+00:00' exploited: true exploitAvailable: true published: '2026-10-28' updated: '2026-10-30' sourceUpdated: '2026-10-30T03:55:57.976Z' source: CVEORG sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-76418' references: - url: >- https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-tunnel-dos-s6mgkb75 label: cisco-sa-asaftd-tunnel-dos-s6mgkb75 tags: - cve.org - in-the-wild - exploit-available - kev epss: 0.00821 epssPercentile: 0.57407 kev: true kevDateAdded: '2026-10-29' kevDueDate: '2026-11-01' kevRansomware: false zeroDay: true ingestedAt: '2026-11-03T10:42:03.623Z' --- ## Overview A vulnerability in the Remote Access SSL VPN service 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. This vulnerability is due to logic errors when secondary authentication is configured on a tunnel group. An attacker could exploit this vulnerability by sending a crafted request when connecting to the SSL remote access VPN. A successful exploit could allow the attacker to cause the affected device to reload, resulting in a DoS condition. ## Affected - `secure_firewall_adaptive_security_appliance_asa_software 9.16.1` - `secure_firewall_adaptive_security_appliance_asa_software 9.16.1.28` - `secure_firewall_adaptive_security_appliance_asa_software 9.16.2` - `secure_firewall_adaptive_security_appliance_asa_software 9.16.2.3` - `secure_firewall_adaptive_security_appliance_asa_software 9.16.2.7` - `secure_firewall_adaptive_security_appliance_asa_software 9.16.2.11` - `secure_firewall_adaptive_security_appliance_asa_software 9.16.2.13` - `secure_firewall_adaptive_security_appliance_asa_software 9.16.2.14` - `secure_firewall_adaptive_security_appliance_asa_software 9.16.3.3` - `secure_firewall_adaptive_security_appliance_asa_software 9.16.3` - `secure_firewall_adaptive_security_appliance_asa_software 9.16.3.14` - `secure_firewall_adaptive_security_appliance_asa_software 9.18.1` - `secure_firewall_adaptive_security_appliance_asa_software 9.16.3.15` - `secure_firewall_adaptive_security_appliance_asa_software 9.18.1.3` - `secure_firewall_adaptive_security_appliance_asa_software 9.18.2` - `secure_firewall_adaptive_security_appliance_asa_software 9.16.3.19` - `secure_firewall_adaptive_security_appliance_asa_software 9.16.3.23` - `secure_firewall_adaptive_security_appliance_asa_software 9.18.2.5` - `secure_firewall_adaptive_security_appliance_asa_software 9.16.4` - `secure_firewall_adaptive_security_appliance_asa_software 9.18.2.7` - `secure_firewall_adaptive_security_appliance_asa_software 9.19.1` - `secure_firewall_adaptive_security_appliance_asa_software 9.16.4.9` - `secure_firewall_adaptive_security_appliance_asa_software 9.18.2.8` - `secure_firewall_adaptive_security_appliance_asa_software 9.16.4.14` - `secure_firewall_adaptive_security_appliance_asa_software 9.18.3` - `secure_firewall_adaptive_security_appliance_asa_software 9.19.1.5` - `secure_firewall_adaptive_security_appliance_asa_software 9.16.4.18` - `secure_firewall_adaptive_security_appliance_asa_software 9.19.1.9` - `secure_firewall_adaptive_security_appliance_asa_software 9.18.3.39` - `secure_firewall_adaptive_security_appliance_asa_software 9.16.4.19` - `secure_firewall_adaptive_security_appliance_asa_software 9.19.1.12` - `secure_firewall_adaptive_security_appliance_asa_software 9.18.3.46` - `secure_firewall_adaptive_security_appliance_asa_software 9.16.4.27` - `secure_firewall_adaptive_security_appliance_asa_software 9.19.1.18` - `secure_firewall_adaptive_security_appliance_asa_software 9.18.3.53` - `secure_firewall_adaptive_security_appliance_asa_software 9.18.3.55` - `secure_firewall_adaptive_security_appliance_asa_software 9.16.4.38` - `secure_firewall_adaptive_security_appliance_asa_software 9.16.4.39` - `secure_firewall_adaptive_security_appliance_asa_software 9.18.3.56` - `secure_firewall_adaptive_security_appliance_asa_software 9.20.1` - `secure_firewall_adaptive_security_appliance_asa_software 9.16.4.42` - `secure_firewall_adaptive_security_appliance_asa_software 9.19.1.22` - `secure_firewall_adaptive_security_appliance_asa_software 9.18.4` - `secure_firewall_adaptive_security_appliance_asa_software 9.20.1.5` - `secure_firewall_adaptive_security_appliance_asa_software 9.18.4.5` - `secure_firewall_adaptive_security_appliance_asa_software 9.19.1.24` - `secure_firewall_adaptive_security_appliance_asa_software 9.16.4.48` - `secure_firewall_adaptive_security_appliance_asa_software 9.18.4.8` - `secure_firewall_adaptive_security_appliance_asa_software 9.20.2` - `secure_firewall_adaptive_security_appliance_asa_software 9.19.1.27` ## Remediation Refer to the linked advisories for vendor-supplied fixes and affected version ranges.