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CVE-2026-20079

Cisco Firewall Management Center Authentication Bypass Using an Alternate Path or Channel Vulnerability

Cisco Cisco Secure Firewall Management Center (FMC) CWE-288

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.

CVSS Score
10
Critical
EPSS — Exploit Probability
76%
Riskier than 99% of all CVEs · checked 2026-09-19
Exploitation
Confirmed in the wild
KEV since 2026-09-09
Remediation
unknown
Federal deadline 2026-09-12
CISA required action

Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines. Deadline for federal agencies: 2026-09-12.

NVD entry PoC / advisory CISA KEV

14 articles across 7 outlets · first covered Aug 6, 2026 · latest Sep 17, 2026

Associated threat actors

UAT-12197 Qilin Sandworm

Coverage timeline

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