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Cisco Secure Firewall Threat Defense Software TLS 1.3 Denial of Service Vulnerability

Source: cisco / cisco-sa-ftd-tls1.3-dos-dLxwFWgF — original advisory

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

CVEs

CVECVSSCWEExploitation
CVE-2026-20135 8.6 CWE-415: Double Free Not observed in the wild

Affected Products

ProductAffected versionsFixed version
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 7.6.0 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