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Cisco Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense Software IKEv2 Certificate Authentication Denial of Service Vulnerability

Source: cisco / cisco-sa-asaftd-ikev2cert-dos-uWyc2xtv — original advisory

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

CVEs

CVECVSSCWEExploitation
CVE-2026-20249 8.6 CWE-704 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 9.16.4.89 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 9.16.4.92 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 9.18.4.135 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 9.18.4.71 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.18.4.76 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 9.18.4.82 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 9.20.4.19 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.20.4.22 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.20.4.28 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.20.4.30 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 9.22.2.32 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 9.22.3 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 9.23.1.195 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 9.23.1.26 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 9.23.1.32 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 Adaptive Security Appliance (ASA) Software 9.24.1 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.24.1.155 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.24.1.5 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.24.1.9 Not specified by vendor Not specified by vendor
Cisco Secure Firewall Threat Defense (FTD) Software 10.0.0 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 7.0.9 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 7.2.11 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 7.4.7 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