Cisco Secure Firewall ASA and FTD Software Vulnerability CVE-2026-76418 Added to CISA KEV List

## Overview CISA has added CVE-2026-76418 to its Known Exploited Vulnerabilities (KEV) list. This vulnerability affects the Remote Access SSL VPN service in Cisco Secure Firewall ASA and FTD Software. The addition to the KEV list indicates a federal deadline for remediation. Exploitation evidence suggests that attackers can leverage this flaw to cause devices to reload unexpectedly. ## Technical Details The vulnerability stems from unchecked return values leading to NULL pointer dereference. This occurs specifically when secondary authentication is configured on a tunnel group. An unauthenticated remote attacker can exploit the flaw by sending a specially crafted request to the SSL remote access VPN. A successful attack can trigger a device reload, leading to a denial of service (DoS). ## Impact Exploitation of CVE-2026-76418 can result in significant disruptions. Affected devices may experience unexpected reloads, impacting availability and service continuity. Organizations using Cisco Secure Firewall ASA and FTD Software should prioritize addressing this vulnerability to prevent potential service outages. ## Mitigation Cisco has released patches to address CVE-2026-76418. Administrators should apply these updates immediately. Additionally, review configurations for secondary authentication on tunnel groups. Regularly monitor network traffic for unusual patterns that may indicate exploitation attempts.