Cisco ASA and FTD Firewalls Affected by DoS Vulnerability in SSL VPN Already Exploited in the Wild

Vulnerabilities & ExploitsCisco ASA and FTD Firewalls Affected by DoS Vulnerability in SSL VPN Already Exploited in the Wild

Cisco Systems has disclosed a denial-of-service vulnerability affecting its Cisco Secure Firewall ASA and Cisco Secure Firewall FTD products. The flaw, tracked as CVE-2026-76418, resides in the SSL VPN feature and carries a CVSS v3.1 base score of 8.6, rated High severity. When secondary authentication is configured for tunnel groups in the SSL remote access VPN login service, an attacker can send a specially crafted request during the connection process to reboot the device without any authentication. This triggers a service denial state on the affected appliance. Cisco confirmed active exploitation of the issue in October 2026 and has released patches for both products. Organizations are strongly advised to apply the updates immediately to prevent further abuse.

Security NEXTOct 29, 2026Translated from Japanese

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