CVE-2024-20351

Cisco Firepower Threat Defense Software Snort Firewall Denial of Service Vulnerability

HIGH

7.5

CVSS Score

Published: October 23, 2024 at 05:09 PM UTC

Updated: August 11, 2026 at 07:40 PM UTC

2 products affected across 1 vendorSecure Firewall Threat DefenseFirepower Threat Defense

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Severity

HIGH7.5

Exploit prediction

EPSS 0.7%

SSVC

No known exploit

Description

A vulnerability in the TCP/IP traffic handling function of the Snort Detection Engine of Cisco Firepower Threat Defense (FTD) Software and Cisco FirePOWER Services could allow an unauthenticated, remote attacker to cause legitimate network traffic to be dropped, resulting in a denial of service (DoS) condition. This vulnerability is due to the improper handling of TCP/IP network traffic. An attacker could exploit this vulnerability by sending a large amount of TCP/IP network traffic through the affected device. A successful exploit could allow the attacker to cause the Cisco FTD device to drop network traffic, resulting in a DoS condition. The affected device must be rebooted to resolve the DoS condition.