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5.8
Cisco Products: Malicious Data Can Crash the Snort 3 Detection Engine
CVE-2026-20057
Summary
Multiple Cisco products that use the Snort 3 Detection Engine may be affected by a vulnerability that allows a hacker to send malicious data that can cause the engine to crash, leading to a denial of service. This could be done without needing a password or other authentication. To protect your system, ensure you have the latest software updates installed.
Original title
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 Detecti...
Original 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.
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.
nvd CVSS3.1
5.8
Vulnerability type
CWE-369
Published: 4 Mar 2026 · Updated: 13 Mar 2026 · First seen: 6 Mar 2026