First published Oct 29, 2026, 7:36:15 PM UTC · Last updated Oct 29, 2026, 7:36:15 PM UTC

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

Reported by CISA Known Exploited Vulnerabilities

The vulnerability could let an unauthenticated remote attacker cause affected devices to reload and create a denial-of-service condition. The source recommends applying mitigations in line with vendor and CISA guidance.

Illustrative image: This image shows a list of firewall rules. — Matthew Franzyshen/Wikimedia Commons, CC BY-SA 4.0

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Why it matters

The source identifies a remote denial-of-service risk and calls for mitigation or discontinuing use if mitigations are unavailable.

Generated scores

Scores are based on the cited reporting and use a 1–10 scale. Read the methodology.

Confidence: 5/10How certain the assessment is based on the clarity and evidence in the cited reporting.
Geographic reach: 1/10How widely the event reaches, from a local area (1) to worldwide impact (10).
Global importance: 2/10The event's broader significance, from limited importance (1) to major global importance (10).
Impact magnitude: 3/10The scale or severity of the real-world impact, from minor (1) to extreme (10).
Urgency: 6/10How time-sensitive the event is, from low urgency (1) to immediate attention needed (10).

Primary official sources

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

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