CVE-2020-3459: Cisco Firepower Extensible Operating System

High severity, CVSS 7.8. EPSS: 0.4% chance of exploitation in the next 30 days.

A vulnerability in the CLI of Cisco FXOS Software could allow an authenticated, local attacker to inject arbitrary commands that are executed with root privileges. The vulnerability is due to insufficient input validation of commands 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 commands on the underlying operating system with root privileges.

Affected products

• Cisco Firepower Extensible Operating System: before 2.4.1.266 (fixed in 2.4.1.266); from 2.6, before 2.6.1.204 (fixed in 2.6.1.204); from 2.7, before 2.7.1.131 (fixed in 2.7.1.131); from 2.8, before 2.8.1.125 (fixed in 2.8.1.125)

Published 2020-10-21. Last modified 2026-06-17.