Snort 3 VBA Decompression DoS (CVE-2026-20057)
CVE-2026-20057 Published on March 4, 2026
Cisco Secure Firewall Threat Defense Software Snort 3 Visual Basic for Application Denial of Service Vulnerability
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.
Vulnerability Analysis
CVE-2026-20057 can be exploited with network access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity, and a small impact on availability.
Weakness Type
Divide By Zero
The product divides a value by zero. This weakness typically occurs when an unexpected value is provided to the product, or if an error occurs that is not properly detected. It frequently occurs in calculations involving physical dimensions such as size, length, width, and height.
Products Associated with CVE-2026-20057
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Affected Versions
Cisco Cyber Vision:- Version 3.0.0 is affected.
- Version 3.0.2 is affected.
- Version 3.0.3 is affected.
- Version 3.0.1 is affected.
- Version 3.1.0 is affected.
- Version 3.0.4 is affected.
- Version 3.1.1 is affected.
- Version 3.1.2 is affected.
- Version 3.2.0 is affected.
- Version 3.0.5 is affected.
- Version 3.2.1 is affected.
- Version 3.0.6 is affected.
- Version 3.2.2 is affected.
- Version 3.2.3 is affected.
- Version 3.2.4 is affected.
- Version 4.0.0 is affected.
- Version 4.0.1 is affected.
- Version 4.0.2 is affected.
- Version 4.0.3 is affected.
- Version 4.1.0 is affected.
- Version 4.1.1 is affected.
- Version 4.1.2 is affected.
- Version 4.1.3 is affected.
- Version 4.1.4 is affected.
- Version 4.2.0 is affected.
- Version 4.2.1 is affected.
- Version 4.1.5 is affected.
- Version 4.2.2 is affected.
- Version 4.2.X is affected.
- Version 4.2.3 is affected.
- Version 4.2.4 is affected.
- Version 4.2.6 is affected.
- Version 4.1.6 is affected.
- Version 4.3.0 is affected.
- Version 4.3.1 is affected.
- Version 4.3.2 is affected.
- Version 4.3.3 is affected.
- Version 4.4.0 is affected.
- Version 4.4.1 is affected.
- Version 4.4.2 is affected.
- Version 4.4.3 is affected.
- Version 4.1.7 is affected.
- Version 5.0.0 is affected.
- Version 5.0.1 is affected.
- Version 5.0.2 is affected.
- Version 5.1.0 is affected.
- Version 5.1.1 is affected.
- Version 5.1.2 is affected.
- Version 5.1.3 is affected.
- Version 5.2.0 is affected.
- Version 5.2.1 is affected.
- Version 5.3.0 is affected.
- Version 5.3.1 is affected.
- Version 7.2.0 is affected.
- Version 7.2.0.1 is affected.
- Version 7.2.1 is affected.
- Version 7.3.0 is affected.
- Version 7.2.2 is affected.
- Version 7.2.3 is affected.
- Version 7.3.1 is affected.
- Version 7.2.4 is affected.
- Version 7.2.5 is affected.
- Version 7.2.4.1 is affected.
- Version 7.3.1.1 is affected.
- Version 7.4.0 is affected.
- Version 7.2.5.1 is affected.
- Version 7.4.1 is affected.
- Version 7.2.6 is affected.
- Version 7.4.1.1 is affected.
- Version 7.2.7 is affected.
- Version 7.2.5.2 is affected.
- Version 7.3.1.2 is affected.
- Version 7.2.8 is affected.
- Version 7.6.0 is affected.
- Version 7.4.2 is affected.
- Version 7.2.8.1 is affected.
- Version 7.4.2.1 is affected.
- Version 7.2.9 is affected.
- Version 7.7.0 is affected.
- Version 7.4.2.2 is affected.
- Version 7.2.10 is affected.
- Version 7.6.1 is affected.
- Version 7.4.2.3 is affected.
- Version 7.6.2 is affected.
- Version 7.7.10 is affected.
- Version 7.6.2.1 is affected.
- Version 7.7.10.1 is affected.
- Version 7.4.2.4 is affected.
- Version 7.2.10.2 is affected.
- Version 7.4.3 is affected.
- Version 17.12.1a is affected.
- Version 17.12.2 is affected.
- Version 17.13.1a is affected.
- Version 17.12.3 is affected.
- Version 17.14.1a is affected.
- Version 17.12.4 is affected.
- Version 17.12.3a is affected.
- Version 17.15.1a is affected.
- Version 17.16.1a is affected.
- Version 17.12.4a is affected.
- Version 17.15.2c is affected.
- Version 17.12.4b is affected.
- Version 17.15.2a is affected.
- Version 17.12.5 is affected.
- Version 17.17.1 is affected.
- Version 17.12.5a is affected.
- Version 17.15.3a is affected.
- Version 17.15.3 is affected.
- Version 17.12.5b is affected.
- Version 17.12.5c is affected.
- Version 17.15.4 is affected.
- Version 17.18.1 is affected.
- Version 17.18.1a is affected.
- Version 17.12.6 is affected.
- Version 17.15.4c is affected.
- Version 17.12.5d is affected.
- Version 17.18.2 is affected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.