CVE-2026-20057
Received Received - Intake
Denial of Service in Cisco Snort 3 via VBA Decompression

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 Visual Basic for Applications (VBA) feature which could allow an unauthenticated, remote attacker to cause the Snort 3 Detection Engine to crash.    This vulnerability is due to lack of proper error checking when decompressing VBA data. An attacker could exploit this vulnerability by sending a 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 a denial of service (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-2026-20057
EUVD
EUVD-2026-9461
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-369 The product divides a value by zero.
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Executive Summary

This vulnerability affects multiple Cisco products that use the Snort 3 Visual Basic for Applications (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 on the targeted device.

If successfully exploited, the attacker can cause the Snort 3 Detection Engine to crash and restart unexpectedly, leading to a denial of service (DoS) condition.

Impact Analysis

The primary impact of this vulnerability is a denial of service (DoS) condition. An attacker can cause the Snort 3 Detection Engine to crash and restart unexpectedly, which may disrupt network security monitoring and intrusion detection capabilities.

This disruption could reduce the effectiveness of security defenses, potentially allowing other attacks to go undetected during the downtime.

Compliance Impact

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Detection Guidance

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