ZDI-CAN-33575: ZDI-26-867: Cisco Snort sf_unfold_header Out-Of-Bounds Write Remote Code Execution Vulnerability

Published Nov 3, 2026

Updated

This vulnerability allows remote attackers to execute arbitrary code on affected installations of Cisco Snort. Authentication is not required to exploit this vulnerability. The ZDI has assigned a CVSS rating of 9.8. The following CVEs are assigned: CVE-2026-20043.

Event History

Nov 3, 2026

Advisory Published

via ZDI·06:00 AM

Data Sourced

via ZDI·06:00 AM

Description

Frequently Asked Questions

What level of access does an attacker need to exploit this issue?

Authentication is not required. A remote attacker can exploit the vulnerability to execute arbitrary code on affected Cisco Snort installations.

How severe is the vulnerability?

The ZDI assigned this issue a CVSS score of 9.8, indicating a critical severity level.

ZDI-CAN-33575: ZDI-26-867: Cisco Snort sf_unfold_header Out-Of-Bounds Write Remote Code Execution Vulnerability

Event History

Frequently Asked Questions

What level of access does an attacker need to exploit this issue?

How severe is the vulnerability?

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Frequently Asked Questions

What level of access does an attacker need to exploit this issue?

How severe is the vulnerability?