CVE-2026-20099 MEDIUM

CVE-2026-20099: Cisco UCS Manager and FXOS Software Command Injection Vulnerability

Vendor Cisco
Product Cisco Firepower Extensible Operating System (FXOS)
Weakness CWE-78
Published February 25, 2026
Last update February 26, 2026

CVSS base score

6.7/10
Attack vector Local
Attack complexity Low
Privileges required High
User interaction None
Confidentiality High
Integrity High

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

What the vulnerability does

01Description

A vulnerability in the web-based management interface of Cisco FXOS Software and Cisco UCS Manager Software could allow an authenticated, local attacker with administrative privileges to perform command injection attacks on an affected system and elevate privileges to root.  This vulnerability is due to insufficient input validation of command arguments supplied by the user. An attacker could exploit this vulnerability by authenticating to a device and submitting crafted input to the affected command. A successful exploit could allow the attacker to execute arbitrary commands on the underlying operating system of the affected device with root-level privileges.

Key dates

02Disclosure timeline

February 25, 2026 CVE published
February 26, 2026 Record updated