No official fix confirmed yet
Until a fix ships, follow the vendor's mitigations, limit exposure of affected systems, and watch this record for a patch.
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.
Source: NIST National Vulnerability Database. Official vulnerability data, reproduced as published.
Developments from the last 30 days, newest first.
CVE-2026-76418 scored CVSS 8.6
Basis: NIST National Vulnerability Database
Attackers Exploit Second Cisco Firewall VPN Zero-Day Since August
Source reporting says attackers are already exploiting this, so exposed Cisco networking & security systems are at immediate risk.
Basis: Reporting by SecurityWeek
Source reporting says attackers are already exploiting this, so exposed Cisco networking & security systems are at immediate risk.
Treat this as an emergency.
