Security update for Windows 10, version 1507, Windows 8.1, RT 8.1, Server 2012 R2, and Server 2012: February 11, 2020

適用対象: Windows 10Windows 8.1Windows RT 8.1


This update makes quality improvements to the supported Windows OS versions listed in the "Applies to" section. Key changes include the following:

  • Addresses an issue in which a third-party Unified Extensible Firmware Interface (UEFI) boot manager might expose UEFI-enabled computers to a security vulnerability.

To learn more about this security update, see Microsoft Common Vulnerabilities and Exposures.

How to get this update

Method 1: Windows Update 

This update is available through Windows Update. It will be downloaded and installed automatically.  

Method 2: Microsoft Update Catalog 

To get the stand-alone package for this update, go to the Microsoft Update Catalog website.

Method 3: Windows Server Update Services

This update is also available through Windows Server Update Services (WSUS).


There are no prerequisites to apply this update.

Restart information 

Your device does not have to restart when you apply this update. If you have Windows Defender Credential Guard (Virtual Secure Mode) enabled, your device will restart two times. 

Update replacement information 

This update does not replace any previously released update.

File information

File verification

File attributes

The English (United States) version of this software update installs files that have the attributes that are listed in the following tables.

Windows 10

Windows 8.1, Windows RT 8.1 and Windows Server 2012 R2

Note The MANIFEST files (.manifest) and MUM files (.mum) that are installed are not listed.

Windows Server 2012

Note The MANIFEST files (.manifest) and MUM files (.mum) that are installed are not listed.


Learn about the terminology that Microsoft uses to describe software updates.