Occurred Aug 11, 2026, 12:00:00 AM UTC

First published Oct 27, 2026, 8:14:15 PM UTC · Last updated Oct 27, 2026, 8:14:15 PM UTC

CVE-2026-20349: Cisco Secure Firewall Adaptive Security Appliance (ASA) and Secure Firewall Threat Defense (FTD) Heap Inspection Vulnerability

Reported by CISA Known Exploited Vulnerabilities

The source describes a heap inspection vulnerability in Cisco firewall products that could let an unauthenticated remote attacker cause an unexpected device reload and denial of service. It calls for mitigations in line with vendor instructions and cited CISA guidance.

Illustrative image: A Cisco ASA 5510 firewall — ShakataGaNai/Wikimedia Commons, CC BY-SA 3.0

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Why it matters

The described vulnerability could disrupt affected devices, and the source 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: 6/10How certain the assessment is based on the clarity and evidence in the cited reporting.
Geographic reach: 2/10How 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: 5/10How time-sensitive the event is, from low urgency (1) to immediate attention needed (10).

Primary official sources

CISA Known Exploited Vulnerabilities CVE-2026-20349: Cisco Secure Firewall Adaptive Security Appliance (ASA) and Secure Firewall Threat Defense (FTD) Heap Inspection Vulnerability

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