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CISA Known Exploited Vulnerability

This CVE is actively exploited in the wild. CISA mandates federal agencies to patch immediately.

CVE

CVE-2026-20079

10.0

CVSScritical

Exploitable remotely over the internet · no authentication required.

Description

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. 

Attack Vector

Network

Privileges Req.

None

User Interaction

None

cisco secure firewall management center (fmc)

Updated Nov 10, 2026View on NVD →

S4E scanner

criticalProduct Based Web Vulnerabilities~10 seconds

Cisco Secure Firewall Management Center - Authentication Bypass

Cisco Secure Firewall Management Center Software contains an authentication bypass caused by improper system process creation at boot, letting unauthenticated remote attackers execute scripts and gain root access, exploit requires crafted HTTP requests. References: https://www.vulncheck.com/blog/cisco-fmc-auth-bypass-cve-2026-20079 https://nvd.nist.gov/vuln/detail/CVE-2026-20079 Remediation: Update to the latest available version.

Used 20 times · 10 assets checked · domain, subdomain, ipv4

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CVE history: cisco secure firewall management center (fmc)

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