CVE-2026-76418: Cisco Secure Firewall ASA Software and Cisco Secure FTD Software Unchecked Return Value to NULL Pointer Dereference Vulnerability
Summary
Cisco Secure Firewall ASA and FTD software have an unchecked return value to NULL pointer dereference vulnerability. This could allow an unauthenticated, remote attacker to cause a denial of service (DoS) by reloading the device. Cisco advises applying mitigations as per vendor instructions and adhering to CISA's guidance on prioritizing security updates.
IFF Assessment
This vulnerability allows an unauthenticated, remote attacker to cause a denial of service, which is detrimental to defenders by disrupting critical security infrastructure.
Severity
CISA KEV: Listed as actively exploited. Federal patch due: November 01, 2026. Known ransomware use: Unknown.
Defender Context
This vulnerability impacts Cisco Secure Firewall products, which are critical for network security. Defenders need to be aware of this DoS flaw and prioritize applying any available vendor mitigations or patches. Failure to do so could lead to network disruptions, leaving systems vulnerable to further attacks.