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CVE-2026-20079

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

Cisco · CWE-288 · in CISA KEV since 2026-09-09

CISA federal deadline · Overdue by 44 daysCISA KEVActively Exploited
89

EVRS 89 of 100 Immediate

Patch Immediately

Rank 164 of 2,963 tracked

Download PDF

Why it scores 89

Evidence available: 6 of 7 signals

Listed in the CISA KEV catalog, and an EPSS probability of 0.885.

  • CISA KEVApplied
  • RansomwareDid not apply
  • Vendor exploitationDid not apply
  • EPSSApplied
  • Microsoft Exploitability IndexNot applicable
  • Pre-patch disclosureNo data
  • KEV recencyApplied
  • CVSSApplied

The band answers “how soon”, not “how bad”. No data for: Pre-patch disclosure. Why some signals show no data

Fix

Patch or fixed version identified

CISA required action

Fixed in

Cisco Secure Firewall Management Center (FMC) Appliances -> 7.0

Affected versions

  • secure firewall management center7.0.07.0.0.17.0.17.0.1.17.0.27.0.2.17.0.37.0.47.0.57.0.67.0.6.17.0.6.27.0.6.37.0.77.0.87.0.8.17.0.97.1.07.1.0.17.1.0.27.1.0.37.2.07.2.0.17.2.17.2.27.2.37.2.3.17.2.47.2.4.17.2.57.2.5.17.2.5.27.2.67.2.77.2.87.2.8.17.2.97.2.107.2.10.17.2.10.27.2.117.3.07.3.17.3.1.17.3.1.27.4.07.4.17.4.1.17.4.27.4.2.17.4.2.27.4.2.37.4.2.47.4.37.4.47.4.57.4.67.4.77.6.07.6.17.6.27.6.2.17.6.37.6.47.6.57.7.07.7.107.7.10.17.7.117.7.1210.0.010.0.1

Remediation

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.

Fixed versions from NVD.

Evidence

Each value with its source
MeasureValueSource
CVSS base scoreHow severe the flaw is in itself. It does not say how likely an attack is. 10.0 NVD
FIRST EPSSFIRST's estimate of the chance this is exploited in the next 30 days, and how that ranks against all CVEs. 0.885 (99.77th pctl) FIRST EPSS
Actively exploitedWhether a source of record has confirmed attacks using it in the wild. Confirmed CISA KEV
Ransomware campaign useWhether CISA has seen ransomware operators use it. Unknown or none CISA KEV
CISA remediation deadlineThe date US federal agencies must have fixed or mitigated it. 2026-09-12 · CISA federal deadline · Overdue by 44 days CISA KEV
Public exploit moduleA module existing is not the same as active exploitation. Public module exists Metasploit
EUVD cross-referenceENISA's record: CVSS 10.0 (v3.1), assigned by cisco. Listed ENISA EUVD

Description

NVD

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. 

What CISA says to do

Public module

Metasploit lists a public normal-rank module for this CVE: Cisco Secure Firewall Management Center Authentication Bypass RCE (linux/http/cisco_fmc_auth_bypass_rce). A module existing is not the same as active exploitation; see metasploit.com.