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CVE-2025-20333

CISA KEV

Published September 25, 2025 · Updated April 3, 2026

high
Official Description+

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.

Affected Products

VendorProduct
CiscoSecure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense

Patch Status

Patch by 2025-09-26

Recommended Actions

  1. Check if your systems use any of the affected products listed above.
  2. Apply vendor patches immediately if available.
  3. This vulnerability is in CISA's Known Exploited Vulnerabilities catalog — prioritize remediation.
  4. Monitor vendor advisories for updates and additional mitigations.
  5. Review logs for indicators of compromise related to CVE-2025-20333.