PT-2026-23025 · Cisco · Cisco Snort 3 Detection Engine

Jason Crowder · CVE-2026-20067 · Published 2026-03-04 · Updated 2026-03-04

Positive Technologies (AI Summary)

CVSS v3.1

5.8

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions Cisco Snort 3 Detection Engine (affected versions not specified)

Description A flaw exists in the Snort 3 detection engine that may allow a remote attacker to disrupt packet inspection. This is due to insufficient validation when processing Multicast DNS fields within HTTP headers. An attacker could exploit this by sending specially crafted HTTP packets through an existing connection, potentially causing the Snort 3 Detection Engine to restart and leading to a denial-of-service (DoS) condition.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

DoS

Memory Corruption

Weakness Enumeration

CWE-787

Related Identifiers

CVE-2026-20067

Affected Products

Cisco Snort 3 Detection Engine

References · 4

• https://nvd.nist.gov/vuln/detail/CVE-2026-20067 · Security Note
• https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-snort3-multi-dos-XFWkWSwz · Vendor Advisory
• https://twitter.com/CVEnew/status/2029272785718047203 · Twitter Post
• https://twitter.com/VulmonFeeds/status/2029303080609612127 · Twitter Post