CVE-2026-20026
Unknown Unknown - Not Provided
Use-After-Free in Cisco Snort 3 Causes DoS via DCE/RPC

Publication date: 2026-01-07

Last updated on: 2026-01-07

Assigner: Cisco Systems, Inc.

Description
Multiple Cisco products are affected by a vulnerability in the processing of DCE/RPC requests that could allow an unauthenticated, remote attacker to cause the Snort 3 Detection Engine to leak sensitive information or to restart, resulting in an interruption of packet inspection. This vulnerability is due to an error in buffer handling logic when processing DCE/RPC requests, which can result in a buffer use-after-free read. An attacker could exploit this vulnerability by sending a large number of DCE/RPC requests through an established connection that is inspected by Snort 3. A successful exploit could allow the attacker to unexpectedly restart the Snort 3 Detection Engine, which could cause a denial of service (DoS).
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Meta Information
Published
2026-01-07
Last Modified
2026-01-07
Generated
2026-06-16
AI Q&A
2026-01-07
EPSS Evaluated
2026-06-15
NVD
CVE-2026-20026
EUVD
EUVD-2026-1192
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
cisco snort_3 *
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-415 The product calls free() twice on the same memory address.
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Executive Summary

This vulnerability exists in multiple Cisco products due to an error in buffer handling logic when processing DCE/RPC requests in the Snort 3 Detection Engine. It can be exploited by an unauthenticated, remote attacker who sends a large number of DCE/RPC requests through an established connection inspected by Snort 3. This can cause a buffer use-after-free read, leading to sensitive information leakage or an unexpected restart of the Snort 3 Detection Engine.

Impact Analysis

Exploitation of this vulnerability can cause the Snort 3 Detection Engine to leak sensitive information or restart unexpectedly. The restart results in an interruption of packet inspection, causing a denial of service (DoS) condition. This could impact network security monitoring and potentially expose sensitive data.

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