PT-2026-23018 · Cisco · Cisco Snort 3

Jason Crowder · Published 2026-03-04 · Updated 2026-03-04 · CVE-2026-20053

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 VBA feature that may allow a remote attacker to cause the Snort 3 Detection Engine to crash. This is due to improper range checking during the decompression of VBA data, which is controlled by the user. An attacker could exploit this by sending crafted VBA data to the Snort 3 Detection Engine, potentially leading to a heap data overflow and a denial-of-service (DoS) condition.

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

DoS

Heap Based Buffer Overflow

Weakness Enumeration

CWE-122

Related Identifiers

CVE-2026-20053

Affected Products

Cisco Snort 3

References · 4

• https://nvd.nist.gov/vuln/detail/CVE-2026-20053 · Security Note
• https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ftd-snort3-vbavuls-96UcVVed · Vendor Advisory
• https://twitter.com/CVEnew/status/2029272792357646483 · Twitter Post
• https://twitter.com/VulmonFeeds/status/2029323560292856065 · Twitter Post