PT-2026-23020 · Cisco · Cisco Snort 3

Jason Crowder · Published 2026-03-04 · Updated 2026-03-04 · CVE-2026-20057

Positive Technologies (AI Summary)

CVSS v3.1

5.8

Medium

Base vector

AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L

Name of the Vulnerable Software and Affected Versions Cisco Snort 3 (affected versions not specified)

Description A flaw exists in the Snort 3 Visual Basic for Applications (VBA) feature that could allow a remote, unauthenticated attacker to crash the Snort 3 Detection Engine. This is caused by insufficient error checking during VBA data decompression. An attacker could exploit this by sending specially crafted VBA data to the engine, leading to a denial of service (DoS) condition and unexpected restarts.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

DoS

Divide By Zero

Weakness Enumeration

CWE-369

Related Identifiers

CVE-2026-20057

Affected Products

Cisco Snort 3

References · 4

• https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ftd-snort3-vbavuls-96UcVVed · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-20057 · Security Note
• https://twitter.com/CVEnew/status/2029272790386258363 · Twitter Post
• https://twitter.com/VulmonFeeds/status/2029318439429361751 · Twitter Post