CVE-2026-20017: Cisco Secure Firewall Threat Defense

Medium severity, CVSS 6.0. EPSS: 0.2% chance of exploitation in the next 30 days.

A vulnerability in the CLI of Cisco Secure FTD Software could allow an authenticated, local attacker to execute arbitrary commands on the underlying operating system as root. To exploit this vulnerability, the attacker must have valid administrative credentials on an affected device. This vulnerability is due to insufficient input validation of user-supplied command arguments. An attacker could exploit this vulnerability by submitting crafted input for a specific CLI command. A successful exploit could allow the attacker to execute commands on the underlying operating system as root.

Affected products

• Cisco Secure Firewall Threat Defense: from 6.4.0, up to and including 6.4.0.18; from 7.0.0, up to and including 7.0.8.1; from 7.1.0, up to and including 7.1.0.3; from 7.2.0, up to and including 7.2.10; from 7.3.0, up to and including 7.3.1.2; from 7.4.0, up to and including 7.4.3; …

Published 2026-03-04. Last modified 2026-08-11.