CVE-2026-20058
Received Received - Intake
Improper Error Handling in Cisco Snort 3 Causes DoS

Publication date: 2026-03-04

Last updated on: 2026-03-04

Assigner: Cisco Systems, Inc.

Description
Multiple Cisco products are affected by vulnerabilities in the Snort 3 VBA feature that could allow an unauthenticated, remote attacker to cause the Snort 3 Detection Engine to crash. These vulnerabilities are due to improper error checking when decompressing VBA data. An attacker could exploit these vulnerabilities by sending crafted VBA data to the Snort 3 Detection Engine on the targeted device. A successful exploit could allow the attacker to cause the Snort 3 Detection Engine to unexpectedly restart, causing a DoS condition.
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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-2026-20058
EUVD
EUVD-2026-9462
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-786 The product reads or writes to a buffer using an index or pointer that references a memory location prior to the beginning of the buffer.
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Executive Summary

This vulnerability affects multiple Cisco products that use the Snort 3 VBA feature. It arises from improper error checking when decompressing VBA data. An unauthenticated, remote attacker can exploit this by sending specially crafted VBA data to the Snort 3 Detection Engine, causing it to crash.

The crash results in the Snort 3 Detection Engine unexpectedly restarting, which leads to a denial-of-service (DoS) condition.

Impact Analysis

Exploitation of this vulnerability can cause the Snort 3 Detection Engine to crash and restart unexpectedly, resulting in a denial-of-service (DoS) condition.

This DoS condition can disrupt the normal operation of the affected Cisco products, potentially impacting network security monitoring and intrusion detection capabilities.

Compliance Impact

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Detection Guidance

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