Public preview. Built from real public data on November 9, 2026, 5:41 AM UTC.
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VulnerabilityKnown exploitedExploit likelihood 89%

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

CVE-2026-20079 · CISA KEV · September 9, 2026

Summary

Cisco Secure Firewall Management Center (FMC) Software and Cisco Security Cloud Control (SCC) Firewall Management contain an authentication Bypass using an alternate path or channel vulnerability that 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.

From CISA, quoted as published. Check the source before acting.

What to do

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.

CISA required action, quoted.

Affected products

VendorProductAffected versionsFixed
CiscoSecure Firewall Management Center (FMC) and Security Cloud Control (SCC) Firewall Management——

Why it's on these mode pages

  • Maritime: Vendor table: Cisco (network and remote-access gear used in every mode, all modes) (matched by rule)
  • Pipeline: Vendor table: Cisco (network and remote-access gear used in every mode, all modes) (matched by rule)
  • Freight rail: Vendor table: Cisco (network and remote-access gear used in every mode, all modes) (matched by rule)
  • Passenger rail and transit: Vendor table: Cisco (network and remote-access gear used in every mode, all modes) (matched by rule)
  • Highway and motor carrier: Vendor table: Cisco (network and remote-access gear used in every mode, all modes) (matched by rule)
  • Postal and parcel: Vendor table: Cisco (network and remote-access gear used in every mode, all modes) (matched by rule)

Change history

  1. November 9, 2026: First collected by Watch

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