Cisco Firewall DoS Flaw Exploited in ASA and FTD

Cisco firewall DoS flaw CVE-2026-76418: a crafted SSL VPN request reloads Cisco ASA and Secure FTD firewalls, exploited, CISA KEV, October 2026

A Cisco firewall DoS flaw is being exploited: one crafted request to the SSL VPN login can make a Cisco ASA or Secure FTD firewall reload unexpectedly. Cisco tracks it as CVE-2026-76418 (CVSS 8.6), and CISA added it to the Known Exploited Vulnerabilities catalog on October 29. Only firewalls with secondary authentication set on a…

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