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CVE-2026-20079

Cisco Secure Firewall Management Center Authentication Bypass Remote Code Execution Vulnerability

CVSS 10 critical · Cisco Cisco Secure Firewall Management Center (FMC) · published 2026-03-04

A vulnerability in the web interface of Cisco Secure Firewall Management Center (FMC) Software could allow an unauthenticated, remote attacker to bypass authentication and execute script files on an affected device to obtain root access to the underlying operating system.  This vulnerability is due to an improper system process that is created at boot time. An attacker could exploit this vulnerability by sending crafted HTTP requests to an affected device. A successful exploit could allow the attacker to execute a variety of scripts and commands that allow root access to the device. 

NVD · CVE.org

Coverage 2 sources

  1. 2026-09-09 CISA Cybersecurity Advisories high CISA Adds Four Known Exploited Vulnerabilities to Catalog

    CISA added four new vulnerabilities to its Known Exploited Vulnerabilities Catalog.

  2. 2026-09-10 Help Net Security critical Cisco FMC bugs exploited by nation-state and ransomware actors (CVE-2026-20079, CVE-2026-20316)

    Cisco FMC vulnerabilities CVE-2026-20079 and CVE-2026-20316 are under active exploitation by nation-state and ransomware actors.

Mentioned with

CVE-2025-25249 CVE-2026-19490 CVE-2026-20316 CVE-2026-87491

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