Check Point Advisories

Microsoft Web Threat Defense Denial of Service (CVE-2025-29971)

Vulnerability
Protection

Check Point Reference:	CPAI-2025-0290
Date Published:	13 May 2025
Severity:	High
Last Updated:	Tuesday 13 May, 2025
Source:	Microsoft CVE-2025-29971
Industry Reference:	CVE-2025-29971
Protection Provided by:	Security Gateway R81, R80, R77, R75
Who is Vulnerable?	Windows 11 Version 22H2 for ARM64-based Systems Windows 11 Version 22H2 for x64-based Systems Windows 11 Version 23H2 for ARM64-based Systems Windows 11 Version 23H2 for x64-based Systems Windows 11 Version 24H2 for ARM64-based Systems Windows 11 Version 24H2 for x64-based Systems
Vulnerability Description	A denial of service vulnerability exists in Microsoft Windows Web Threat Defense. Successful exploitation of this vulnerability would allow a remote attacker to create a denial of service condition on the affected system.

Protection Overview

This protection detects attempts to exploit this vulnerability.

In order for the protection to be activated, update your Security Gateway product to the latest IPS update. For information on how to update IPS, go to SBP-2006-05, click on Protection tab and select the version of your choice.

Security Gateway R81 / R80 / R77 / R75

In the IPS tab, click Protections and find the Microsoft Web Threat Defense Denial of Service (CVE-2025-29971) protection using the Search tool and Edit the protection's settings.
Install policy on all Security Gateways.

This protection's log will contain the following information:

Attack Name: Content Protection Violation.
Attack Information: Microsoft Web Threat Defense Denial of Service (CVE-2025-29971)