CVE-2020-3307: Cisco Secure Firewall Management Center

Medium severity, CVSS 5.3. EPSS: 1% chance of exploitation in the next 30 days.

A vulnerability in the web UI of Cisco Firepower Management Center (FMC) Software could allow an unauthenticated, remote attacker to write arbitrary entries to the log file on an affected device. The vulnerability is due to insufficient input validation. An attacker could exploit this vulnerability by sending a crafted HTTP request to an affected device. A successful exploit could allow the attacker to send incorrect information to the system log on the affected system.

Affected products

• Cisco Secure Firewall Management Center: version 6.2.2 only; version 6.2.3 only; version 6.3.0 only; version 6.4.0 only; version 6.5.0 only

Published 2020-05-06. Last modified 2026-06-17.