ASA / Firepower Threat Defense 9.20 vulnerabilities

14 advisories affect Cisco ASA / Firepower Threat Defense 9.20, 8 already exploited by attackers. Latest: October 29, 2026.

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Vulnerability	Severity	Affected versions
Cisco Secure Firewall ASA Software and Cisco Secure FTD Software Unchecked Return Value to NULL Pointer Dereference Vulnerability CVE-2026-76418 · October 29, 2026	High 8.6 Exploited	26 versions, from 9.20.1 to 9.20.4.235
Cisco Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense Software Remote Access SSL VPN Tunnel Denial of Service Vulnerability CVE-2026-76418 · October 28, 2026	High 8.6 Exploited	26 versions, from 9.20.1 to 9.20.4.235
Cisco Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense Software SSL VPN Denial of Service Vulnerability CVE-2024-20260 · September 23, 2026	High 8.6	19 versions, from 9.20.1 to 9.20.4.19
Cisco Secure Firewall Adaptive Security Appliance, Secure Firewall Threat Defense, and Secure Firewall Management Center Software Hardening Release: September 2026 CVE-2026-20329 +7 · September 18, 2026	Critical 9.9	24 versions, from 9.20.1 to 9.20.4.235
Cisco Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense Software Logging Denial of Service Vulnerability CVE-2026-20154 · September 18, 2026	High 8.6	18 versions, from 9.20.1 to 9.20.4.14
Cisco Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense Software IKEv2 Certificate Authentication Denial of Service Vulnerability CVE-2026-20249 · September 18, 2026	High 8.6	22 versions, from 9.20.1 to 9.20.4.30
Cisco Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense Software EIGRP Denial of Service Vulnerability CVE-2026-20222 · September 18, 2026	High 7.4	24 versions, from 9.20.1 to 9.20.4.235
Cisco Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense Software TCP DNS Denial of Service Vulnerability CVE-2026-20248 · September 18, 2026	Medium 6.8	24 versions, from 9.20.1 to 9.20.4.235
Cisco Secure Firewall Adaptive Security Appliance (ASA) and Secure Firewall Threat Defense (FTD) Heap Inspection Vulnerability CVE-2026-20349 · August 11, 2026	High 8.6 Exploited	23 versions, from 9.20.1 to 9.20.4.34
Cisco Secure Firewall Adaptive Security Appliance (ASA) and Secure Firewall Threat Defense (FTD) Buffer Overflow Vulnerability CVE-2025-20333 · September 25, 2025	Critical 9.9 Exploited	8 versions, from 9.20.1 to 9.20.3.4
Cisco Secure Firewall Adaptive Security (ASA) Appliance and Secure Firewall Threat Defense (FTD) Missing Authorization Vulnerability CVE-2025-20362 · September 25, 2025	Medium 6.5 Exploited	16 versions, from 9.20.1 to 9.20.4.7
Cisco ASA and FTD Denial-of-Service Vulnerability CVE-2024-20481 · October 24, 2024	Medium 5.8 Exploited	5 versions, from 9.20.1 to 9.20.2.21
Cisco ASA and FTD Denial of Service Vulnerability CVE-2024-20353 · April 24, 2024	High 8.6 Exploited	9.20.1; 9.20.1.5; 9.20.2
Cisco ASA and FTD Privilege Escalation Vulnerability CVE-2024-20359 · April 24, 2024	Medium 6 Exploited	9.20.1; 9.20.1.5; 9.20.2

Affected versions are compiled automatically from vendor advisories and NVD and may contain errors. Where no fixed version is shown, you will find it in the official advisory linked from every page: check it there before updating.

Other ASA / Firepower Threat Defense versions: 10.1 · 10.0 · 9.24 · 9.23 · 9.22 · 9.19 · 9.18 · 9.17 · 9.16 · 9.15 · 9.14 · 9.12 · 9.8 · 7.7 · 7.6 · 7.4 · 7.3 · 7.2 · 7.1 · 7.0 · 6.7 · 6.6 · 6.4 · 6.2