Security update for Windows 8.1, RT 8.1, and Server 2012 R2: August 19, 2020

Applies to: Windows 8.1Windows RT 8.1Windows Server 2012 R2


This update resolves vulnerabilites in the Windows operating systems that are listed in the "Applies to" section. To learn more about these vulnerabilites, see the following articles:

How to get this update

Microsoft Update Catalog

To get the standalone package for this update, go to the Microsoft Update Catalog website.


There are no prerequisites to apply this update.

Restart information 

You might have to restart your device after you apply this update.

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.


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