CVE-2026-20065 MEDIUM

CVE-2026-20065: Multiple Cisco Products Snort 3 TBD Denial of Service Vulnerability

Vendor Cisco
Product Cisco Secure Firewall Threat Defense (FTD) Software
Weakness CWE-667
Published March 4, 2026
Last update March 4, 2026

CVSS base score

5.8/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality None
Integrity None

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L

What the vulnerability does

01Description

Multiple Cisco products are affected by a vulnerability in the Snort 3 Detection Engine that could allow an unauthenticated, remote attacker to cause the Snort 3 Detection Engine to restart, resulting in an interruption of packet inspection. This vulnerability is due to an error in the binder module initialization logic of the Snort Detection Engine. An attacker could exploit this vulnerability by sending certain packets through an established connection that is parsed by Snort 3. A successful exploit could allow the attacker to cause a DoS condition when the Snort 3 Detection Engine restarts unexpectedly.

Key dates

02Disclosure timeline

March 4, 2026 CVE published
March 4, 2026 Record updated