CVE-2026-20079KEV · OVERDUECWE-288

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

Critical · published March 4, 2026

Patch now

Confirmed exploited, and the score agrees

CVSS calls it critical at 10.0. It is confirmed in active exploitation. It sits in the 99.8th percentile for exploit probability.

42
days past CISA
deadline
CVSS v3.1
10.0
EPSS
88%
Percentile
99.8
In the wild
Confirmed
What it is

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. 

The record
Technical detail
CVSS v3.1
10.0 · CRITICAL
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.88472 · 99.8th percentile
Weakness
CWE-288 · Authentication Bypass Using an Alternate Path or Channel
Published
2026-03-04T23:16Z
KEV added
2026-09-09 · due 2026-09-12
Affected products (72)
ProductVersionsFixed in
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References (4)
EPSS history
Timeline
  • 25 SEP 03:24Z
    EPSS moved 76% → 88%
    epss
  • 11 SEP 03:17Z
    EPSS moved 36% → 75%
    epss
  • 04 MAR 17:17Z
    Cisco Secure Firewall Management Center Authentication Bypass Remote Code Execution Vulnerability
    cvelistv5