CVE-2026-20065
Received Received - Intake
Denial of Service in Cisco Snort 3 Detection Engine

Publication date: 2026-03-04

Last updated on: 2026-03-04

Assigner: Cisco Systems, Inc.

Description
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.
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Meta Information
Published
2026-03-04
Last Modified
2026-03-04
Generated
2026-06-16
AI Q&A
2026-03-04
EPSS Evaluated
2026-06-15
NVD
CVE-2026-20065
EUVD
EUVD-2026-9464
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
cisco snort_3 *
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Exploitability
CWE
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KEV
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CWE ID Description
CWE-667 The product does not properly acquire or release a lock on a resource, leading to unexpected resource state changes and behaviors.
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Executive Summary

This vulnerability affects multiple Cisco products that use the Snort 3 Detection Engine. It is caused by an error in the binder module initialization logic within Snort 3. An unauthenticated, remote attacker can exploit this by sending specially crafted packets through an established connection that Snort 3 parses. Exploiting this vulnerability causes the Snort 3 Detection Engine to restart unexpectedly.

The unexpected restart results in an interruption of packet inspection by Snort 3.

Impact Analysis

The primary impact of this vulnerability is a denial of service (DoS) condition. When exploited, the Snort 3 Detection Engine restarts unexpectedly, causing an interruption in packet inspection.

This interruption could allow malicious traffic to pass undetected during the downtime, potentially compromising network security.

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