PT-2026-23017 · Cisco+1 · Cisco Secure Firewall Threat Defense (Ftd)+1

Published 2026-03-04 · Updated 2026-03-04 · CVE-2026-20052

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 Secure Firewall Threat Defense (FTD) Software (affected versions not specified)

Description A flaw exists in the memory management of the Snort 3 Detection Engine that may allow a remote, unauthenticated attacker to cause the engine to restart. This issue stems from a logic error in memory management during Snort 3 SSL packet inspection. An attacker could exploit this by sending specially crafted SSL packets through an existing connection for parsing by the Snort 3 Detection Engine, potentially leading to a denial of service (DoS) condition due to the unexpected restart of the engine.

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

Access of Memory Location After End of Buffer

Weakness Enumeration

CWE-788

Related Identifiers

CVE-2026-20052

Affected Products

Cisco Secure Firewall Threat Defense (Ftd)

Snort 3 Detection Engine

References · 3

• https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ftd-snort3ssl-FBEKYXpH · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-20052 · Security Note
• https://twitter.com/CVEnew/status/2029272793255206993 · Twitter Post