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CVE-2026-20079

Cisco Secure Firewall Management Center Authentication Bypass Remote Code Execution Vulnerability

  • Critical 10.0
  • Exploited: added to CISA KEV 9 Sep 2026

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. 

Key facts

Published
4 Mar 2026
Last changed
16 Sep 2026
Assigned by
cisco
KEV added
9 Sep 2026
KEV fix due
12 Sep 2026
EPSS
88.658% likely to be exploited in the next 30 days, higher than 99.778% of CVEs (scores for 15 Nov 2026)
SSVC (CISA)
Exploitation: active; Automatable: yes; Technical impact: total

Severity scores

Each score is shown as its source gave it. They are not averaged or merged.

  • 10.0CVSS 3.1, Criticalfrom the CNA (cisco)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

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 KEV required action

Historical context and remediation

This reference retains the original CVE publication date. A recent record update does not mean a new attack occurred.

No separately sourced impact summary is available on this page yet. Consult the description, version data and dated exploitation evidence.

Version statuses below come from the CNA. An “unaffected” version is not necessarily a currently supported release or proof of a patch date. EPSS is a dated risk estimate, not a count of historical attacks.

Read the original CVE record.

Affected products

VendorProductVersions
CiscoCisco Secure Firewall Management Center (FMC)
  • Default status: unknown
  • 7.0.0 (affected)
  • 7.0.0.1 (affected)
  • 7.0.1 (affected)
  • 7.1.0 (affected)
  • 7.0.1.1 (affected)
  • 7.1.0.1 (affected)
  • 7.0.2 (affected)
  • 7.2.0 (affected)
  • 7.0.2.1 (affected)
  • 7.0.3 (affected)
  • 7.1.0.2 (affected)
  • 7.2.0.1 (affected)
  • 7.0.4 (affected)
  • 7.2.1 (affected)
  • 7.0.5 (affected)
  • 7.3.0 (affected)
  • 7.2.2 (affected)
  • 7.3.1 (affected)
  • 7.2.3 (affected)
  • 7.1.0.3 (affected)
  • 7.2.3.1 (affected)
  • 7.2.4 (affected)
  • 7.0.6 (affected)
  • 7.2.4.1 (affected)
  • 7.2.5 (affected)
  • 7.3.1.1 (affected)
  • 7.4.0 (affected)
  • 7.0.6.1 (affected)
  • 7.2.5.1 (affected)
  • 7.4.1 (affected)
  • 7.2.6 (affected)
  • 7.4.1.1 (affected)
  • 7.0.6.2 (affected)
  • 7.2.7 (affected)
  • 7.2.5.2 (affected)
  • 7.3.1.2 (affected)
  • 7.2.8 (affected)
  • 7.6.0 (affected)
  • 7.4.2 (affected)
  • 7.2.8.1 (affected)
  • 7.0.6.3 (affected)
  • 7.4.2.1 (affected)
  • 7.2.9 (affected)
  • 7.0.7 (affected)
  • 7.7.0 (affected)
  • 7.4.2.2 (affected)
  • 7.2.10 (affected)
  • 7.6.1 (affected)
  • 7.4.2.3 (affected)
  • 7.0.8 (affected)
  • 7.6.2 (affected)
  • 7.7.10 (affected)
  • 7.2.10.1 (affected)
  • 7.0.8.1 (affected)
  • 7.6.2.1 (affected)
  • 7.2.10.2 (affected)
  • 7.7.10.1 (affected)
  • 7.4.2.4 (affected)
  • 7.4.3 (affected)
  • 7.6.3 (affected)
  • 7.7.11 (affected)
  • 7.6.4 (affected)
  • 10.0.0 (affected)
  • 7.4.4 (affected)
  • 7.4.5 (affected)
  • 7.0.9 (affected)
  • 7.2.11 (affected)
  • 7.7.12 (affected)
  • 7.6.5 (affected)
  • 7.4.6 (affected)
  • 10.0.1 (affected)
  • 7.4.7 (affected)

Timeline

  1. 4 Mar 2026 Published
  2. 9 Sep 2026 Added to the CISA KEV catalogue

Weakness

References