CVE-2026-20349: Cisco Secure Firewall Adaptive Security Appliance (ASA) and Secure Firewall Threat Defense (FTD)
Cisco Secure Firewall Adaptive Security Appliance (ASA) and Secure Firewall Threat Defense (FTD) contain a heap inspection vulnerability that could allow an unauthenticated, remote attacker to cause the device to reload unexpectedly, resulting in a denial of service (DoS) condition.
- Vendor
- Cisco
- Product
- Secure Firewall Adaptive Security Appliance (ASA) and Secure Firewall Threat Defense (FTD)
- Vulnerability
- Cisco Secure Firewall Adaptive Security Appliance (ASA) and Secure Firewall Threat Defense (FTD) Heap Inspection Vulnerability
- Date added
- Aug 11, 2026
- CISA due date (U.S. federal agencies)
- Aug 14, 2026
- Known ransomware campaign use
- Unknown
- Weakness (CWE)
- CWE-244
References
This site summarizes CISA's catalog for information only. It is not security advice — follow your vendor's guidance and official advisories.
Last updated: · Catalog version 2026.10.02