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Cisco Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense Software Logging Denial of Service Vulnerability

Source: cisco / cisco-sa-asa-ftd-logging-dos-ZXXNesfN — original advisory

Published: 2026-09-16 · Last updated: 2026-09-16 · Vendor severity: High

CVEs

CVECVSSCWEExploitation
CVE-2026-20154 8.6 CWE-835: Infinite Loop (Loop with Unreachable Exit Condition) Not observed in the wild

Affected Products

ProductAffected versionsFixed version
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.16.1 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.16.1.28 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.16.2 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.16.2.11 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.16.2.13 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.16.2.14 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.16.2.3 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.16.2.7 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.16.3 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.16.3.14 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.16.3.15 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.16.3.19 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.16.3.23 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.16.3.3 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.16.4 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.16.4.14 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.16.4.18 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.16.4.19 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.16.4.27 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.16.4.38 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.16.4.39 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.16.4.42 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.16.4.48 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.16.4.55 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.16.4.57 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.16.4.61 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.16.4.62 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.16.4.67 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.16.4.70 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.16.4.71 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.16.4.76 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.16.4.82 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.16.4.84 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.16.4.85 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.16.4.9 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.18.1 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.18.1.3 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.18.2 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.18.2.5 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.18.2.7 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.18.2.8 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.18.3 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.18.3.39 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.18.3.46 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.18.3.53 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.18.3.55 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.18.3.56 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.18.4 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.18.4.22 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.18.4.24 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.18.4.29 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.18.4.34 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.18.4.40 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.18.4.47 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.18.4.5 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.18.4.50 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.18.4.52 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.18.4.53 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.18.4.57 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.18.4.66 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.18.4.67 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.18.4.68 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.18.4.8 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.19.1 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.19.1.12 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.19.1.18 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.19.1.22 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.19.1.24 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.19.1.27 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.19.1.28 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.19.1.31 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.19.1.37 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.19.1.38 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.19.1.42 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.19.1.5 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.19.1.9 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.20.1 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.20.1.5 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.20.2 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.20.2.10 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.20.2.21 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.20.2.22 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.20.3 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.20.3.10 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.20.3.13 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.20.3.16 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.20.3.20 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.20.3.4 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.20.3.7 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.20.3.9 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.20.4 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.20.4.10 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.20.4.14 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.20.4.7 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.22.1.1 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.22.1.2 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.22.1.3 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.22.1.6 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.22.2 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.22.2.13 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.22.2.14 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.22.2.20 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.22.2.4 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.22.2.9 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.23.1 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.23.1.13 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.23.1.19 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.23.1.22 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.23.1.3 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.23.1.7 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Threat Defense (FTD) Software 7.0.0 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Threat Defense (FTD) Software 7.0.0.1 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Threat Defense (FTD) Software 7.0.1 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Threat Defense (FTD) Software 7.0.1.1 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Threat Defense (FTD) Software 7.0.2 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Threat Defense (FTD) Software 7.0.2.1 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Threat Defense (FTD) Software 7.0.3 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Threat Defense (FTD) Software 7.0.4 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Threat Defense (FTD) Software 7.0.5 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Threat Defense (FTD) Software 7.0.6 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Threat Defense (FTD) Software 7.0.6.1 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Threat Defense (FTD) Software 7.0.6.2 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Threat Defense (FTD) Software 7.0.6.3 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Threat Defense (FTD) Software 7.0.7 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Threat Defense (FTD) Software 7.0.8 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Threat Defense (FTD) Software 7.0.8.1 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Threat Defense (FTD) Software 7.2.0 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Threat Defense (FTD) Software 7.2.0.1 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Threat Defense (FTD) Software 7.2.1 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Threat Defense (FTD) Software 7.2.10 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Threat Defense (FTD) Software 7.2.10.2 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Threat Defense (FTD) Software 7.2.2 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Threat Defense (FTD) Software 7.2.3 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Threat Defense (FTD) Software 7.2.4 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Threat Defense (FTD) Software 7.2.4.1 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Threat Defense (FTD) Software 7.2.5 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Threat Defense (FTD) Software 7.2.5.1 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Threat Defense (FTD) Software 7.2.5.2 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Threat Defense (FTD) Software 7.2.6 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Threat Defense (FTD) Software 7.2.7 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Threat Defense (FTD) Software 7.2.8 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Threat Defense (FTD) Software 7.2.8.1 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Threat Defense (FTD) Software 7.2.9 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Threat Defense (FTD) Software 7.3.0 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Threat Defense (FTD) Software 7.3.1 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Threat Defense (FTD) Software 7.3.1.1 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Threat Defense (FTD) Software 7.3.1.2 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Threat Defense (FTD) Software 7.4.0 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Threat Defense (FTD) Software 7.4.1 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Threat Defense (FTD) Software 7.4.1.1 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Threat Defense (FTD) Software 7.4.2 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Threat Defense (FTD) Software 7.4.2.1 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Threat Defense (FTD) Software 7.4.2.2 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Threat Defense (FTD) Software 7.4.2.3 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Threat Defense (FTD) Software 7.4.2.4 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Threat Defense (FTD) Software 7.4.3 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Threat Defense (FTD) Software 7.4.4 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Threat Defense (FTD) Software 7.6.0 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Threat Defense (FTD) Software 7.6.1 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Threat Defense (FTD) Software 7.6.2 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Threat Defense (FTD) Software 7.6.2.1 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Threat Defense (FTD) Software 7.6.4 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Threat Defense (FTD) Software 7.7.0 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Threat Defense (FTD) Software 7.7.10 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Threat Defense (FTD) Software 7.7.10.1 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Threat Defense (FTD) Software 7.7.11 Not specified by vendor Not specified by vendor