August 30, 2018—KB4343889 (OS Build 15063.1292)

Applies to: Windows 10, version 1703

Improvements and fixes


This update includes quality improvements. No new operating system features are being introduced in this update. Key changes include:

  • Addresses an issue that causes win32kfull.sys to stop working (Stop 3B) when cancelling journal hook operations or disconnecting a remote session. 
  • Addresses an issue in Microsoft Foundation Class (MFC) applications that may cause applications to flicker. 
  • Addresses an issue that displays incorrect changes to folder contents. 
  • Addresses an issue that prevented the Device Guard PackageInspector.exe application from including all the files needed for an application to run correctly once the Code Integrity policy was completed. 
  • Addresses an issue that prevents users of PIV/CAC smart cards from authenticating to use enterprise resources or prevents Windows Hello for Business from configuring on first logon. 
  • Addresses an issue that causes Microsoft Edge to stop working after setting a DLL rule in AppLocker. 
  • Addresses an issue that prevents users from logging on when an Azure Active Directory account domain changes. 
  • Addresses an issue that causes PowerShell scripts to stop working when attempting operations such as Get-Credentials. 
  • Addresses an issue that, in some cases, failed to clear decrypted data from memory after a CAPI decryption operation was completed. 
  • Addresses an issue that causes high CPU usage on machines with built-in Sierra broadband modules when switching from WLAN to LAN. The WWanSvc service continually claims additional memory until the machine becomes unresponsive and a black screen appears. 
  • Addresses an issue that causes the Wi-Fi EAP-TTLS (CHAP) authentication to fail if a user saves credential information before authentication. 
  • Addresses an issue that causes a connection failure when the Remote Desktop Service does not read the bypass list for a proxy that has multiple entries.

If you installed earlier updates, only the new fixes in this package will be downloaded and installed on your device.

For more information about the resolved security vulnerabilities, see the Security Update Guide.

Known issues in this update


Symptom Workaround

After you install the August Preview of Quality Rollup or September 11, 2018 .NET Framework update, instantiation of SqlConnection can throw an exception. For more information about this issue, see the following article in the Microsoft Knowledge Base:

4470809 SqlConnection instantiation exception on .NET 4.6 and later after August-September 2018 .NET Framework updates

Microsoft is working on a resolution and will provide an update in an upcoming release.

How to get this update


To download and install this update, go to Settings > Update & Security > Windows Update and select Check for updates.

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

File information

For a list of the files that are provided in this update, download the file information for cumulative update 4343889