CVE-2018-0272: Cisco Firepower

Medium severity, CVSS 5.9. EPSS: 1.3% chance of exploitation in the next 30 days.

A vulnerability in the Secure Sockets Layer (SSL) Engine of Cisco Firepower System Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition. The vulnerability is due to improper error handling while processing SSL traffic. An attacker could exploit this vulnerability by sending a large volume of crafted SSL traffic to the vulnerable device. A successful exploit could allow the attacker to degrade the device performance by triggering a persistent high CPU utilization condition. Cisco Bug IDs: CSCvh89340.

Affected products

• Cisco Firepower: version 6.2.1 only; version 6.2.2.1 only

Published 2018-04-19. Last modified 2026-06-17.