CVE-2020-3558: Cisco Secure Firewall Management Center

Medium severity, CVSS 6.1. EPSS: 0.8% chance of exploitation in the next 30 days.

A vulnerability in the web-based management interface of Cisco Firepower Management Center (FMC) Software could allow an unauthenticated, remote attacker to redirect a user to a malicious web page. The vulnerability is due to improper input validation of the parameters of an HTTP request. An attacker could exploit this vulnerability by intercepting an HTTP request from a user. A successful exploit could allow the attacker to modify the HTTP request to cause the interface to redirect the user to a specific, malicious URL. This type of vulnerability is known as an open redirect attack and is used in phishing attacks that get users to unknowingly visit malicious sites.

Affected products

• Cisco Secure Firewall Management Center: from 6.2.0, up to and including 6.2.3.16; from 6.3.0, up to and including 6.3.0.5; from 6.4.0, up to and including 6.4.0.9; from 6.5.0, up to and including 6.5.0.4

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