Check Point Advisories

Microsoft Windows Spoofing (CVE-2025-21308)

Vulnerability
Protection

Check Point Reference:	CPAI-2025-0026
Date Published:	31 Mar 2025
Severity:	Medium
Last Updated:	Monday 31 March, 2025
Source:
Industry Reference:	CVE-2025-21308
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 2012 Standard Edition on x86 Microsoft Windows Server 2012 R2 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 2025 prior to 10.0.26100.2894
Vulnerability Description	A spoofing vulnerability exists in Microsoft Windows. Successful exploitation of this vulnerability would allow a remote attacker to impersonate and present itself as a legitimate host.

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 Spoofing (CVE-2025-21308) 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 Spoofing (CVE-2025-21308)