CVE-2026-76418: Cisco Secure Firewall ASA Software and Cisco Secure FTD Software Unchecked Return Value to NULL Pointer Dereference Vulnerability

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.

Details

Frequently asked questions

Is CVE-2026-76418 being actively exploited?

Yes — CISA lists CVE-2026-76418 in its Known Exploited Vulnerabilities (KEV) catalog, so it is confirmed exploited in the wild. Patch it as a priority.

What does CVE-2026-76418 affect?

CVE-2026-76418 affects Cisco · Secure Firewall ASA Software and Cisco Secure FTD Software.

How do I fix CVE-2026-76418?

Apply the vendor’s patch for the affected software. The federal patch deadline was Nov 1, 2026. Then check whether your personal data was exposed in any related breach.

References

• sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-a
• www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-76418

Official records: NVD · CISA KEV

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