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CVE-2025-20333
CRITICAL · CVSS 9.9 ⚠ KEV — EXPLOITED
EPSS exploitation probability: 99%
⚠ Listed in the CISA Known Exploited Vulnerabilities catalog — actively exploited.
Published 2025-09-25 · Last modified 2026-08-11T19:33:44.513

Summary

A vulnerability in the VPN web server of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an authenticated, remote attacker to execute arbitrary code on an affected device. This vulnerability is due to improper validation of user-supplied input in HTTP(S) requests. An attacker with valid VPN user credentials could exploit this vulnerability by sending crafted HTTP requests to an affected device. A successful exploit could allow the attacker to execute arbitrary code as root, possibly resulting in the complete compromise of the affected device.

Affected products

Cisco — Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense

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References

This product uses data from the NVD API but is not endorsed or certified by the NVD. Informational only; not professional security advice.