PT-2026-23024 · Cisco · Cisco Snort 3 Detection Engine

Jason Crowder · Published 2026-03-04 · Updated 2026-03-04 · CVE-2026-20066

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 an error in the JSTokenizer normalization logic when handling JavaScript during HTTP inspection. An attacker could exploit this by sending specially crafted HTTP packets through an existing connection. Successful exploitation could lead to a denial-of-service condition as the Snort 3 Detection Engine unexpectedly restarts. JSTokenizer is not enabled by default.

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

Resource Exhaustion

Weakness Enumeration

CWE-400

Related Identifiers

CVE-2026-20066

Affected Products

Cisco Snort 3 Detection Engine

References · 3

• https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-snort3-multi-dos-XFWkWSwz · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-20066 · Security Note
• https://twitter.com/CVEnew/status/2029272786670166155 · Twitter Post