Cisco Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense: 2 exploited vulnerabilities (CVE-2025-20333, CVE-2025-20362)
Cisco Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense
CVE-2025-20333: Cisco Secure Firewall Adaptive Security (ASA) Appliance and Secure Firewall Threat Defense (FTD) Software VPN Web Server contain a buffer overflow vulnerability that allows for remote code execution. This vulnerability could be chained with CVE-2025-20362. CVE-2025-20362: Cisco Secure Firewall Adaptive Security (ASA) Appliance and Secure Firewall Threat Defense (FTD) Software VPN Web Server contain a missing authorization vulnerability. This vulnerability could be chained with CVE-2025-20333. Added to CISA KEV on 2025-09-25.
Why this severity: CVSS 9.9 (CNA, v3.1); actively exploited (CISA KEV)
- Started
- Sep 25, 2025
- Closed
- Sep 25, 2025
Affected
- See vendor advisory / CISA notes (versions not always listed in KEV feed)
Fixed in
- See vendor advisory linked in sources
Timeline2
CISA added CVE-2025-20333 to the KEV catalog (due 2025-09-26).
CISA added CVE-2025-20362 to the KEV catalog (due 2025-09-26).
Advisories8
- CISA guidance: Cisco Secure Firewall Adaptive Security Appliance and Secure Firewall Threat DefenseCISA · Sep 25, 2025
- CISA guidance: Cisco Secure Firewall Adaptive Security Appliance and Secure Firewall Threat DefenseCISA · Sep 25, 2025
- CISA guidance: Cisco Secure Firewall Adaptive Security Appliance and Secure Firewall Threat DefenseCISA · Sep 25, 2025
- Cisco advisory: Cisco Secure Firewall Adaptive Security Appliance and Secure Firewall Threat DefenseCisco · Sep 25, 2025
- Cisco advisory: Cisco Secure Firewall Adaptive Security Appliance and Secure Firewall Threat DefenseCisco · Sep 25, 2025
- NVD: CVE-2025-20333NVD · Sep 25, 2025
- NVD: CVE-2025-20362NVD · Sep 25, 2025
- CISA Known Exploited Vulnerabilities CatalogCISA · Sep 25, 2025
Notes & caveats
Derived from CISA KEV JSON feed catalogVersion 2026.10.21. CVSS from the CVE record (cvelistV5). Exact affected/fixed version strings are not always in the KEV record; verify against the vendor advisory URL. startedAt uses dateAdded (exploitation may have begun earlier; many entries are older CVEs newly confirmed as exploited in 2025).
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