CVE-2026-76418: cisco adaptive_security_appliance_software, cisco secure_firewall_threat_defense

CVSS 8.6 (high) · listed as exploited by CISA since 2026-10-29 · published 2026-10-28

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 products (NVD): cisco adaptive_security_appliance_software, cisco secure_firewall_threat_defense

Fixed in (NVD): 9.16.4.104, 9.18.4.96, 9.20.4.50, 9.22.3.200, 9.23.1.48, 9.24.1.27, 7.0.11, 7.2.13, 7.4.9, 7.7.14, 10.0.3

Weakness: CWE-690

Source: NVD CVE-2026-76418

References

• https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-tunnel-dos-s6mgkb75
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-76418

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