HIGHVulnerability
Verified
Global

CISA KEV: Cisco Secure Firewall ASA Software and Cisco Secure FTD Software — Cisco Secure Firewall ASA Software and Cisco Secure FTD Software Unchecked Return Value to NULL Pointer Dereference Vulnerability

·Source: CISA KEV

Updated:

Executive Summary

Cisco Secure Firewall ASA Software and Cisco Secure FTD Software contains an unchecked return value to NULL pointer dereference vulnerability that could allow an unauthenticated, remote attacker to cause the device to reload unexpectedly, resulting in a denial of service (DoS) condition.

Analysis

Cisco Secure Firewall ASA Software and Cisco Secure FTD Software contains an unchecked return value to NULL pointer dereference vulnerability that could allow an unauthenticated, remote attacker to cause the device to reload unexpectedly, resulting in a denial of service (DoS) condition. Added to CISA Known Exploited Vulnerabilities catalog on 2026-10-29. Remediation due: 2026-11-01.

Indicators of Compromise (1)

CVE (1)
CVE-2026-76418
NVDMITRE CVE
Source Attribution

Originally published by CISA KEV on Oct 29, 2026. Verified by: CISA.

Related Threats

CRITICALZero DayNEW

New Cisco firewall zero-day being actively exploited

A high-severity flaw in the Remote Access SSL VPN service of Cisco Secure Firewall Adaptive Security Appliance (ASA) and Cisco Secure Firewall Threat Defense (FTD) is under active exploitation to crash vulnerable devices. The vulnerability, tracked as CVE-2026-76418 and rated 8.6 in severity, is due to logic errors when secondary authentication is configured on a tunnel group, Cisco said in its ad

CVE-2026-76418
CSO Online
CRITICALApt

Cisco Patches Actively Exploited ASA and FTD VPN Flaw That Can Crash Firewalls

Cisco has released patches to address a high-severity security flaw in Secure Firewall Adaptive Security Appliance (ASA) Software and Secure Firewall Threat Defense (FTD) Software that it said has been exploited in the wild. The vulnerability, tracked as CVE-2026-76418, is rated 8.6 on the CVSS scoring system. Successful exploitation could allow an unauthenticated, remote attacker to cause the

CVE-2026-76418
The Hacker News
CRITICALZero Day

Attackers Exploit Second Cisco Firewall VPN Zero-Day Since August

Cisco on Wednesday released fixes for an exploited vulnerability affecting its Secure Firewall Adaptive Security Appliance (ASA) and Secure Firewall Threat Defense (FTD) software. Tracked as CVE-2026-76418 and assigned a CVSS score of 8.6, the bug resides in the Remote Access SSL VPN service. Attackers can exploit it remotely, without authenticating, to force the device […] The post Attacker

CVE-2026-76418
SecurityWeek