CVE-2020-3456: Cisco Firepower Extensible Operating System

High severity, CVSS 8.8. EPSS: 0.6% chance of exploitation in the next 30 days.

A vulnerability in the Cisco Firepower Chassis Manager (FCM) of Cisco FXOS Software could allow an unauthenticated, remote attacker to conduct a cross-site request forgery (CSRF) attack against a user of an affected device. The vulnerability is due to insufficient CSRF protections for the FCM interface. An attacker could exploit this vulnerability by persuading a targeted user to click a malicious link. A successful exploit could allow the attacker to send arbitrary requests that could take unauthorized actions on behalf of the targeted user.

Affected products

• Cisco Firepower Extensible Operating System: version 2.4(1.249) only

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