CVE-2026-20079

Cisco Secure Firewall Management Center Authentication Bypass Remote Code Execution Vulnerability

State: Published
Severity: 10.0 Critical
Published: Mar 4, 2026
Updated: Sep 16, 2026
Reserved: Oct 8, 2025

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. 

Scores

CVSS	Score	Vector	Source
3.1	10.0 Critical	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H	cisco

Weaknesses

CWE-288 Authentication Bypass Using an Alternate Path or Channel

Affected Products

Product	Versions
Cisco Secure Firewall Management Center (FMC)Cisco	7.0.0Affected 7.0.0.1Affected 7.0.1Affected 7.1.0Affected 7.0.1.1Affected 7.1.0.1Affected 7.0.2Affected 7.2.0Affected 7.0.2.1Affected 7.0.3Affected 7.1.0.2Affected 7.2.0.1Affected 7.0.4Affected 7.2.1Affected 7.0.5Affected 7.3.0Affected 7.2.2Affected 7.3.1Affected 7.2.3Affected 7.1.0.3Affected 7.2.3.1Affected 7.2.4Affected 7.0.6Affected 7.2.4.1Affected 7.2.5Affected and 47 more versions

References

cisco-sa-onprem-fmc-authbypass-5JPp45V2
https://blog.talosintelligence.com/fmc-ongoing-exploitation/third-party-advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-20079government-resource
http://seclists.org/fulldisclosure/2026/Aug/80

Every record here comes from the CVE Program’s CVE List. © 1999–2026 The MITRE Corporation. CVE is a registered trademark of The MITRE Corporation. The records are reproduced under the CVE Program terms of use.