JPCERT-AT-2025-0002
                                                             JPCERT/CC
                                                            2025-01-15

                 <<< JPCERT/CC Alert 2025-01-15 >>>

         Microsoft Releases January 2025 Security Updates

       https://www.jpcert.or.jp/english/at/2025/at250002.html


I. Overview
Microsoft has released January 2025 Security Updates to address the
vulnerabilities in their products. Remote attackers leveraging
these vulnerabilities may be able to execute arbitrary code.

    Microsoft Corporation
    January 2025 Security Updates
    https://msrc.microsoft.com/update-guide/en-us/releaseNote/2025-Jan

According to Microsoft, among the vulnerabilities, the following
vulnerabilities have been confirmed to be exploited in the wild.
Please consider applying the security update programs by referring to
the information provided by Microsoft.

    CVE-2025-21333
    Windows Hyper-V NT Kernel Integration VSP Elevation of Privilege Vulnerability 
    https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2025-21333

    CVE-2025-21334
    Windows Hyper-V NT Kernel Integration VSP Elevation of Privilege Vulnerability 
    https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2025-21334

    CVE-2025-21335
    Windows Hyper-V NT Kernel Integration VSP Elevation of Privilege Vulnerability
    https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2025-21335


II. Solution
Please apply the security update programs through Microsoft Update,
Windows Update, etc.

    Microsoft Update Catalog
    https://www.catalog.update.microsoft.com/

    Windows Update: FAQ
    https://support.microsoft.com/en-us/help/12373/windows-update-faq


III. References
    Microsoft Corporation
    Release Notes
    https://msrc.microsoft.com/update-guide/


If you have any information regarding this alert, please contact
JPCERT/CC.

======================================================================
JPCERT Coordination Center (Early Warning Group)
MAIL: ew-info@jpcert.or.jp
https://www.jpcert.or.jp/english/