CVE-2018-0254: Cisco Secure Firewall Threat Defense

Medium severity, CVSS 5.3. EPSS: 1.2% chance of exploitation in the next 30 days.

A vulnerability in the detection engine of Cisco Firepower System Software could allow an unauthenticated, remote attacker to bypass configured file action policies if an Intelligent Application Bypass (IAB) with a drop percentage threshold is also configured. The vulnerability is due to incorrect counting of the percentage of dropped traffic. An attacker could exploit this vulnerability by sending network traffic to a targeted device. An exploit could allow the attacker to bypass configured file action policies, and traffic that should be dropped could be allowed into the network. Cisco Bug IDs: CSCvf86435.

Affected products

• Cisco Secure Firewall Threat Defense: version 6.1.0.5 only; version 6.2.0.2 only; version 6.2.1 only; version 6.2.2 only

Published 2018-04-19. Last modified 2026-08-11.