# Cisco Firepower Threat Defense Software vulnerabilities Source: https://junglewise.ai/threats/technologies/firepower-threat-defense-software Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats Updated: 11 November 2026, 03:07 UTC. Rebuilt every hour. Data: https://junglewise.ai/threats/technologies/firepower-threat-defense-software.json License: CC BY 4.0 with a link back Junglewise Threat Intelligence has tracked 33 vulnerabilities in Cisco Firepower Threat Defense Software: 0 in the last 7 days and 11 in the last 90 days, 8 of them critical and 3 exploited in the wild. The most recent, CVE-2026-20179, was published on 21 October 2026. 1 vulnerability in the last four weeks, down 90% on the four before (10). 0 critical against 4. ## Counts - Last 7 days: 0 - Last 30 days: 1 - Last 90 days: 11 - All time: 33 (8 critical, 3 exploited in the wild) ## About Cisco Firepower Threat Defense Software Cisco firewall and intrusion prevention system software for threat detection and defense. ## Latest Cisco Firepower Threat Defense Software vulnerabilities - [CVE-2026-20179: Cisco Snort 3 GRE detection engine denial of service](https://junglewise.ai/threats/cve-2026-20179-multiple-cisco-products-are-affected-by-a-vulnerability-in-the) (medium, CVSS 5.8, published 21 Oct 2026) - [CVE-2026-20334: Cisco Secure Firewall improper adherence to coding standards](https://junglewise.ai/threats/cve-2026-20334-cisco-secure-firewall-improper-adherence-to-coding-standards) (high, CVSS 8.4, published 16 Sep 2026) - [CVE-2026-20333: Cisco Secure Firewall ASA/FTD/FMC incorrect comparison in security context](https://junglewise.ai/threats/cve-2026-20333-cisco-secure-firewall-asa-ftd-fmc-incorrect-comparison-in) (high, CVSS 8.8, published 16 Sep 2026) - [CVE-2026-20332: Cisco Secure Firewall ASA/FTD/FMC access control vulnerability](https://junglewise.ai/threats/cve-2026-20332-cisco-secure-firewall-asa-ftd-fmc-access-control-vulnerability) (critical, CVSS 9.9, published 16 Sep 2026) - [CVE-2026-20250: Cisco Secure Firewall ASA and FTD DTLS denial of service](https://junglewise.ai/threats/cve-2026-20250-cisco-secure-firewall-asa-and-ftd-dtls-denial-of-service) (high, CVSS 8.6, published 16 Sep 2026) - [CVE-2026-20249: Cisco Secure Firewall IKEv2 certificate authentication denial of service](https://junglewise.ai/threats/cve-2026-20249-cisco-secure-firewall-ikev2-certificate-authentication-denial-of) (high, CVSS 8.6, published 16 Sep 2026) - [CVE-2026-20222: Cisco Secure Firewall ASA and FTD EIGRP denial of service](https://junglewise.ai/threats/cve-2026-20222-cisco-secure-firewall-asa-and-ftd-eigrp-denial-of-service) (high, CVSS 7.4, published 16 Sep 2026) - [CVE-2026-20135: Cisco Secure Firewall Threat Defense TLS 1.3 denial of service](https://junglewise.ai/threats/cve-2026-20135-cisco-secure-firewall-threat-defense-tls-1-3-denial-of-service) (high, CVSS 8.6, published 16 Sep 2026) - [CVE-2026-20330: Cisco Secure Firewall improper input validation in ASA, FTD, and FMC](https://junglewise.ai/threats/cve-2026-20330-cisco-secure-firewall-improper-input-validation-in-asa-ftd-and) (critical, CVSS 9.9, published 16 Sep 2026) - [CVE-2026-20329: Cisco Secure Firewall improper exception handling and input validation](https://junglewise.ai/threats/cve-2026-20329-cisco-secure-firewall-improper-exception-handling-and-input) (critical, CVSS 9.9, published 16 Sep 2026) - [CVE-2026-20331: Cisco Secure Firewall protection mechanism failure](https://junglewise.ai/threats/cve-2026-20331-cisco-secure-firewall-protection-mechanism-failure) (critical, CVSS 9.6, published 16 Sep 2026) - [CVE-2026-20349: Cisco Secure Firewall ASA and FTD denial of service in SSL VPN](https://junglewise.ai/threats/cve-2026-20349-cisco-secure-firewall-asa-and-ftd-denial-of-service-in-ssl-vpn) (critical, exploited in the wild, CVSS 8.6, published 11 Aug 2026) - [CVE-2026-20025: Cisco ASA and FTD Software heap corruption in OSPF protocol](https://junglewise.ai/threats/cve-2026-20025-cisco-asa-and-ftd-software-heap-corruption-in-ospf-protocol) (medium, CVSS 6.8, published 4 Mar 2026) - [CVE-2026-20024: Cisco ASA and FTD Software heap corruption in OSPF protocol](https://junglewise.ai/threats/cve-2026-20024-cisco-asa-and-ftd-software-heap-corruption-in-ospf-protocol) (medium, CVSS 6.8, published 4 Mar 2026) - [CVE-2026-20022: Cisco Secure Firewall ASA and FTD OSPF DoS via insufficient input validation](https://junglewise.ai/threats/cve-2026-20022-cisco-secure-firewall-asa-and-ftd-ospf-dos-via-insufficient-input) (medium, CVSS 6.1, published 4 Mar 2026) - [CVE-2026-20021: Cisco Secure Firewall ASA and FTD OSPF protocol denial of service](https://junglewise.ai/threats/cve-2026-20021-cisco-secure-firewall-asa-and-ftd-ospf-protocol-denial-of-service) (medium, CVSS 4.3, published 4 Mar 2026) - [CVE-2026-20020: Cisco Secure Firewall ASA and FTD OSPF buffer overflow](https://junglewise.ai/threats/cve-2026-20020-cisco-secure-firewall-asa-and-ftd-ospf-buffer-overflow) (medium, CVSS 6.8, published 4 Mar 2026) - [CVE-2026-20102: Cisco Secure Firewall ASA SAML reflected XSS](https://junglewise.ai/threats/cve-2026-20102-cisco-secure-firewall-asa-saml-reflected-xss) (medium, CVSS 6.1, published 4 Mar 2026) - [CVE-2026-20101: Cisco Secure Firewall ASA and FTD SAML 2.0 SSO denial of service](https://junglewise.ai/threats/cve-2026-20101-cisco-secure-firewall-asa-and-ftd-saml-2-0-sso-denial-of-service) (high, CVSS 8.6, published 4 Mar 2026) - [CVE-2026-20100: Cisco Secure Firewall ASA and FTD Remote Access SSL VPN denial of service](https://junglewise.ai/threats/cve-2026-20100-cisco-secure-firewall-asa-and-ftd-remote-access-ssl-vpn-denial-of) (high, CVSS 7.7, published 4 Mar 2026) - [CVE-2026-20073: Cisco Secure Firewall ASA and FTD access control bypass](https://junglewise.ai/threats/cve-2026-20073-cisco-secure-firewall-asa-and-ftd-access-control-bypass) (medium, CVSS 5.8, published 4 Mar 2026) - [CVE-2026-20070: Cisco Secure Firewall ASA and FTD cross-site scripting in VPN web services](https://junglewise.ai/threats/cve-2026-20070-cisco-secure-firewall-asa-and-ftd-cross-site-scripting-in-vpn-web) (medium, CVSS 6.1, published 4 Mar 2026) - [CVE-2026-20069: Cisco ASA and FTD Request Smuggling in VPN Web Services](https://junglewise.ai/threats/cve-2026-20069-cisco-asa-and-ftd-request-smuggling-in-vpn-web-services) (medium, CVSS 4.3, published 4 Mar 2026) - [CVE-2026-20067: Cisco Snort 3 detection engine denial of service](https://junglewise.ai/threats/cve-2026-20067-cisco-snort-3-detection-engine-denial-of-service) (medium, CVSS 5.8, published 4 Mar 2026) - [CVE-2026-20058: Cisco Snort 3 VBA decompression denial of service](https://junglewise.ai/threats/cve-2026-20058-cisco-snort-3-vba-decompression-denial-of-service) (medium, CVSS 5.8, published 4 Mar 2026) ## Most severe Cisco Firepower Threat Defense Software vulnerabilities - [CVE-2025-20333: Cisco ASA and FTD buffer overflow in VPN web server](https://junglewise.ai/threats/cve-2025-20333-cisco-asa-and-ftd-buffer-overflow-in-vpn-web-server) (critical, exploited in the wild, CVSS 9.9, published 25 Sep 2025) - [CVE-2026-20349: Cisco Secure Firewall ASA and FTD denial of service in SSL VPN](https://junglewise.ai/threats/cve-2026-20349-cisco-secure-firewall-asa-and-ftd-denial-of-service-in-ssl-vpn) (critical, exploited in the wild, CVSS 8.6, published 11 Aug 2026) - [CVE-2025-20362: Cisco Secure Firewall ASA and FTD missing authorization in VPN web server](https://junglewise.ai/threats/cve-2025-20362-cisco-secure-firewall-asa-and-ftd-missing-authorization-in-vpn) (critical, exploited in the wild, CVSS 6.5, published 25 Sep 2025) - [CVE-2026-20329: Cisco Secure Firewall improper exception handling and input validation](https://junglewise.ai/threats/cve-2026-20329-cisco-secure-firewall-improper-exception-handling-and-input) (critical, CVSS 9.9, published 16 Sep 2026) - [CVE-2026-20330: Cisco Secure Firewall improper input validation in ASA, FTD, and FMC](https://junglewise.ai/threats/cve-2026-20330-cisco-secure-firewall-improper-input-validation-in-asa-ftd-and) (critical, CVSS 9.9, published 16 Sep 2026) - [CVE-2026-20332: Cisco Secure Firewall ASA/FTD/FMC access control vulnerability](https://junglewise.ai/threats/cve-2026-20332-cisco-secure-firewall-asa-ftd-fmc-access-control-vulnerability) (critical, CVSS 9.9, published 16 Sep 2026) - [CVE-2026-20331: Cisco Secure Firewall protection mechanism failure](https://junglewise.ai/threats/cve-2026-20331-cisco-secure-firewall-protection-mechanism-failure) (critical, CVSS 9.6, published 16 Sep 2026) - [CVE-2025-20363: Cisco multiple platforms code execution in web services](https://junglewise.ai/threats/cve-2025-20363-cisco-multiple-platforms-code-execution-in-web-services) (critical, CVSS 9, published 25 Sep 2025) - [CVE-2026-20333: Cisco Secure Firewall ASA/FTD/FMC incorrect comparison in security context](https://junglewise.ai/threats/cve-2026-20333-cisco-secure-firewall-asa-ftd-fmc-incorrect-comparison-in) (high, CVSS 8.8, published 16 Sep 2026) - [CVE-2026-20250: Cisco Secure Firewall ASA and FTD DTLS denial of service](https://junglewise.ai/threats/cve-2026-20250-cisco-secure-firewall-asa-and-ftd-dtls-denial-of-service) (high, CVSS 8.6, published 16 Sep 2026) ## Vulnerabilities per week 1 vulnerability in the last four weeks, down 90% on the four before (10). 0 critical against 4. | Week of | Vulns | Critical | Exploited | | --- | --- | --- | --- | | 17 Aug 2026 | 0 | 0 | 0 | | 24 Aug 2026 | 0 | 0 | 0 | | 31 Aug 2026 | 0 | 0 | 0 | | 7 Sep 2026 | 0 | 0 | 0 | | 14 Sep 2026 | 10 | 4 | 0 | | 21 Sep 2026 | 0 | 0 | 0 | | 28 Sep 2026 | 0 | 0 | 0 | | 5 Oct 2026 | 0 | 0 | 0 | | 12 Oct 2026 | 0 | 0 | 0 | | 19 Oct 2026 | 1 | 0 | 0 | | 26 Oct 2026 | 0 | 0 | 0 | | 2 Nov 2026 | 0 | 0 | 0 | | 9 Nov 2026 | 0 | 0 | 0 | ## Other Cisco technologies - [Cisco IOS](https://junglewise.ai/threats/technologies/ios): 70 vulnerabilities - [Cisco Identity Services Engine](https://junglewise.ai/threats/technologies/identity-services-engine): 58 vulnerabilities - [Cisco IOS XE](https://junglewise.ai/threats/technologies/ios-xe): 57 vulnerabilities - [Cisco Firepower Threat Defense](https://junglewise.ai/threats/technologies/firepower-threat-defense): 33 vulnerabilities - [Cisco IOS XR](https://junglewise.ai/threats/technologies/ios-xr): 31 vulnerabilities - [Cisco IOS XE Software](https://junglewise.ai/threats/technologies/ios-xe-software): 28 vulnerabilities - [Cisco Adaptive Security Appliance Software](https://junglewise.ai/threats/technologies/secure-firewall-asa-software): 23 vulnerabilities - [Cisco Snort 3](https://junglewise.ai/threats/technologies/snort-3): 20 vulnerabilities - [Cisco Ios Software](https://junglewise.ai/threats/technologies/ios-software): 19 vulnerabilities - [Cisco ISE Passive Identity Connector](https://junglewise.ai/threats/technologies/ise-passive-identity-connector): 19 vulnerabilities - [Cisco Secure Firewall Management Center](https://junglewise.ai/threats/technologies/secure-firewall-management-center): 16 vulnerabilities - [Cisco Unity Connection](https://junglewise.ai/threats/technologies/unity-connection): 16 vulnerabilities ## Sources NVD, GitHub Security Advisories, OSV, the CISA Known Exploited Vulnerabilities catalog, FIRST EPSS and vendor advisories. Rebuilt every hour. Cite as: Junglewise Threat Intelligence, "Cisco Firepower Threat Defense Software vulnerabilities", https://junglewise.ai/threats/technologies/firepower-threat-defense-software, 11 November 2026.