CVE-2020-3309: Cisco Firepower Device Manager On-Box

High severity, CVSS 7.2. EPSS: 1.8% chance of exploitation in the next 30 days.

A vulnerability in Cisco Firepower Device Manager (FDM) On-Box software could allow an authenticated, remote attacker to overwrite arbitrary files on the underlying operating system of an affected device. The vulnerability is due to improper input validation. An attacker could exploit this vulnerability by uploading a malicious file to an affected device. A successful exploit could allow the attacker to overwrite arbitrary files on as well as modify the underlying operating system of an affected device.

Affected products

• Cisco Firepower Device Manager On-Box: before 6.2.3 (fixed in 6.2.3)

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