Check Point Advisories

Microsoft Windows Denial of Service (CVE-2025-21277)

Vulnerability
Protection

Check Point Reference:	CPAI-2025-0063
Date Published:	3 Mar 2025
Severity:	High
Last Updated:	Monday 03 March, 2025
Source:
Industry Reference:	CVE-2025-21277
Protection Provided by:	Security Gateway R81, R80, R77, R75
Who is Vulnerable?	Microsoft Windows 10 1507 prior to 10.0.10240.20890 Microsoft Windows 10 1507 prior to 10.0.10240.20890 Microsoft Windows 10 1607 prior to 10.0.14393.7699 Microsoft Windows 10 1607 prior to 10.0.14393.7699 Microsoft Windows 10 1809 prior to 10.0.17763.6775 Microsoft Windows 10 1809 prior to 10.0.17763.6775 Microsoft Windows 10 21h2 prior to 10.0.19044.5371 Microsoft Windows 10 22h2 prior to 10.0.19045.5371 Microsoft Windows 11 22h2 prior to 10.0.22621.4751 Microsoft Windows 11 23H2 prior to 10.0.22631.4751 Microsoft Windows 11 24h2 prior to 10.0.26100.2894 Microsoft Windows Server 2008 Service Pack 2 Microsoft Windows Server 2008 R2 Service Pack 1 Datacenter Edition on x64 Microsoft Windows Server 2012 Microsoft Windows Server 2012 R2 DataCenter Edition Microsoft Windows Server 2016 prior to 10.0.14393.7699 Microsoft Windows Server 2019 prior to 10.0.17763.6775 Microsoft Windows Server 2022 prior to 10.0.20348.3091 Microsoft Windows Server 2022 23H2 prior to 10.0.25398.1369 Microsoft Windows server 2025 prior to 10.0.26100.2894
Vulnerability Description	A denial-of-service vulnerability exists in Microsoft Windows. 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 Windows Denial of Service (CVE-2025-21277) 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 Windows Denial of Service (CVE-2025-21277)