CVE-2021-34762: Cisco Firepower Management Center Virtual Appliance

High severity, CVSS 8.1. EPSS: 2% 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 authenticated, remote attacker to perform a directory traversal attack on an affected device. The attacker would require valid device credentials. The vulnerability is due to insufficient input validation of the HTTPS URL by the web-based management interface. An attacker could exploit this vulnerability by sending a crafted HTTPS request that contains directory traversal character sequences to an affected device. A successful exploit could allow the attacker to read or write arbitrary files on the device.

Affected products

• Cisco Firepower Management Center Virtual Appliance: version 6.2.3 only; version 6.4.0 only; version 6.5.0 only; version 6.6.1 only; version 6.6.2 only; version 6.6.3 only; …
• Cisco Secure Firewall Threat Defense: before 6.4.0.13 (fixed in 6.4.0.13); from 6.5.0, before 6.6.5 (fixed in 6.6.5); from 6.7.0, before 6.7.0.3 (fixed in 6.7.0.3); from 7.0.0, before 7.0.1 (fixed in 7.0.1)
• Cisco Sourcefire Defense Center: version 6.2.3 only; version 6.4.0 only; version 6.5.0 only; version 6.6.1 only; version 6.6.2 only; version 6.6.3 only; …

Published 2021-10-27. Last modified 2026-08-11.