CVE-2018-0298: Cisco Firepower Extensible Operating System

High severity, CVSS 7.5. EPSS: 2% chance of exploitation in the next 30 days.

A vulnerability in the web UI of Cisco FXOS and Cisco UCS Fabric Interconnect Software could allow an unauthenticated, remote attacker to cause a buffer overflow on an affected system. The vulnerability is due to incorrect input validation in the web UI. An attacker could exploit this vulnerability by sending a malicious HTTP or HTTPS packet directed to the physical management interface of an affected system. A successful exploit could allow the attacker to cause the process to crash and possibly reload the device, resulting in a denial of service (DoS) condition on the affected system. This vulnerability affects Firepower 4100 Series Next-Generation Firewall, Firepower 9300 Security Appliance, UCS 6200 Series Fabric Interconnects, UCS 6300 Series Fabric Interconnects. Cisco Bug IDs: CSCvb61398, CSCvb86799.

Affected products

• Cisco Firepower Extensible Operating System: from 1.1, before 1.1.4.169 (fixed in 1.1.4.169); from 2.0, before 2.0.1.135 (fixed in 2.0.1.135); from 1.1, before 1.1.4.179 (fixed in 1.1.4.179); from 2.0, before 2.0.1.153 (fixed in 2.0.1.153)
• Cisco NX-OS: from 3.0\(2\), before 3.1\(3a\)a (fixed in 3.1\(3a\)a)

Published 2018-06-21. Last modified 2026-06-17.