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Release Date:

31/07/2020

Version:

OS Build 19041.423

IMPORTANT Starting in July 2020, we will resume non-security releases for Windows 10 and Windows Server, version 1809 and later. There is no change to the cumulative monthly security updates (also referred to as the "B" release or Update Tuesday release). For more information, see the blog post Resuming optional Windows 10 and Windows Server non-security monthly updates.

IMPORTANT Starting in July 2020, all Windows Updates will disable the RemoteFX vGPU feature because of a security vulnerability. For more information about the vulnerability, seeCVE-2020-1036 and KB4570006. After you install this update, attempts to start virtual machines (VM) that have RemoteFX vGPU enabled will fail, and messages such as the following will appear:

If you re-enable RemoteFX vGPU, a message similar to the following will appear:

  • “The virtual machine cannot be started because all the RemoteFX-capable GPUs are disabled in Hyper-V Manager.”

  • “The virtual machine cannot be started because the server has insufficient GPU resources.”

  • "We no longer support the RemoteFX 3D video adapter. If you are still using this adapter, you may become vulnerable to security risk. Learn more (https://go.microsoft.com/fwlink/?linkid=2131976)”

For more information about the various types of Windows updates, such as critical, security, driver, service packs, and so on, please see the following article.

Note Follow @WindowsUpdate to find out when new content is published to the release information dashboard.

Highlights

  • Updates an issue with pasting mixed content of images and text from Microsoft Word into Internet Explorer.

  • Updates an issue that might cause the Magnifier to stop working in Microsoft Excel in certain scenarios. As a result, Microsoft Excel might also stop working.

  • Updates an issue that might display 4K high dynamic range (HDR) content darker than expected when you configure certain non-HDR systems for HDR Streaming.

  • Updates an issue that causes the Settings page to close unexpectedly, which prevents default applications from being set up properly.

  • Updates an issue that prevents some applications from printing to network printers.

  • Updates an issue that might prevent internet connectivity on some cellular modems after upgrading to Windows 10, version 2004.

  • Updates an issue that prevents family safety features, such as time limits and activity reporting, from working on ARM64 devices.

Improvements and fixes

This non-security update includes quality improvements. Key changes include:

  • Addresses an issue that prevents you from using sharing functionality in Microsoft Office. This occurs when Conditional Access is enabled.

  • Addresses an issue that occurs when a third-party application loads hidden tabs into Internet Options.

  • Addresses an issue in Microsoft Edge IE mode that occurs when you open multiple documents from a SharePoint site.

  • Addresses an issue in Microsoft Edge IE mode that occurs when you browse using anchor links.

  • Addresses an issue with pasting mixed content of images and text from Microsoft Word into Internet Explorer.

  • Addresses an issue that might cause Microsoft browsers to incorrectly bypass proxy servers.

  • Addresses an issue in the Windows Push Notification (WNS) service that prevents you from selecting a virtual private network (VPN) interface to make outbound connections. As a result, you lose connectivity with the WNS service when forced tunneling is used.

  • Addresses an issue that might cause the Magnifier to stop working in Microsoft Excel in certain scenarios. As a result, Microsoft Excel might also stop working.

  • Addresses an issue that prevents you from installing some .msi apps. This occurs when a device is managed by a Group Policy that redirects the AppData folder to a network folder.

  • Addresses an issue that might display 4K high dynamic range (HDR) content darker than expected when you configure certain non-HDR systems for HDR Streaming.

  • Addresses an issue that causes new child windows to flicker and appear as white squares on server devices that are configured for stark visual contrast.

  • Addresses an issue that causes the Settings page to close unexpectedly, which prevents default applications from being set up properly.

  • Addresses an issue that causes all open Universal Windows Platform (UWP) apps to close unexpectedly. This occurs when their installer calls the Restart Manager to restart File Explorer (explorer.exe).

  • Addresses an issue that prevents Windows 8.1 apps from projecting to a secondary display when those apps use the StartProjectingAsync API.

  • Addresses an issue that prevents family safety features, such as time limits and activity reporting, from working on ARM64 devices.

  • Addresses an issue with File Explorer’s preview of .msg files when Microsoft Outlook 64-bit is installed.

  • Addresses an issue that causes a KERNEL_SECURITY_CHECK_FAILURE (139) stop error when Windows resumes from Sleep and turns on certain Bluetooth headsets.

  • Addresses an issue that might prevent certain display driver reset utilities from properly reinstalling the same driver on the system.

  • Addresses a reliability issue in WDF01000.sys.

  • Addresses an issue that causes the memory cache to increase without boundaries when an application calls the CryptCATAdminCalcHashFromFileHandle() function. With this update, cached memory usage is now limited. Cached memory will not be released until the process ends.

  • Improves support for non-ASCII file paths for Microsoft Defender Advanced Threat Protection (ATP) Auto Incident Response (IR).

  • Addresses an issue that prevents some machines from automatically going into Sleep mode under certain circumstances because of Microsoft Defender ATP Auto IR.

  • Addresses an issue that prevents some machines from running Microsoft Defender ATP Threat & Vulnerability Management successfully.

  • Addresses an issue that prevents Microsoft Defender ATP from applying file exclusions in some cases, which leads to application compatibility issues.

  • Addresses an issue in Microsoft Defender ATP that prevents some machines from reporting the installed applications to Threat & Vulnerability Management.

  • Addresses an issue that causes automatic investigations to fail in Microsoft Defender ATP.

  • Improves Microsoft Defender ATP's ability to identify malicious code injection activities.

  • Addresses an issue that prevents some applications from printing to network printers.

  • Addresses an issue that might cause a printer to be a hidden device in Device Manager after a restart.

  • Addresses an issue that might cause the Print Management console to display script errors when you enable the Extended View option.

  • Addresses an issue that causes printing to fail in certain scenarios.

  • Addresses an issue that might prevent a Windows 10 device from reaching the internet when using a wireless wide area network (WWAN) LTE modem. However, the Network Connectivity Status Indicator (NCSI) in the notification area might still indicate that you are connected to the internet.

  • Addresses an issue that might prevent internet connectivity on some cellular modems after upgrading to Windows 10, version 2004.

  • Addresses an issue that causes telephony applications to lose the first four digits.

  • Addresses an issue with in-memory parity bitmaps that can cause data integrity issues on Parity Storage Spaces.

  • Addresses an issue that prevents the creation of a storage pool using Manage Storage Spaces in Control panel.

  • Addresses an issue that might cause the Microsoft Remote Assistance process (msra.exe) to stop working when a user is receiving assistance during a computer session. The error is 0xc0000005 or 0xc0000409.

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

Windows Update Improvements

Microsoft has released an update directly to the Windows Update client to improve reliability. Any device running Windows 10 configured to receive updates automatically from Windows Update, including Enterprise and Pro editions, will be offered the latest Windows 10 feature update based on device compatibility and Windows Update for Business deferral policy. This doesn't apply to long-term servicing editions.

Known issues in this update

Symptoms

Workaround

When using some apps, such as Microsoft Excel, users of the Microsoft Input Method Editor (IME) for Chinese and Japanese might receive an error, or the app might stop responding or close when attempting to drag using the mouse.

This issue is resolved in KB4571744.

Users of the Microsoft Input Method Editor (IME) for Japanese or Chinese languages might experience issues when attempting various tasks. You might have issues with input, receive unexpected results, or might not be able to enter text.

All IME issues listed in KB4564002 were resolved in KB4586853.

How to get this update

Before installing this update

Microsoft strongly recommends you install the latest servicing stack update (SSU) for your operating system before installing the latest cumulative update (LCU). SSUs improve the reliability of the update process to mitigate potential issues while installing the LCU. For general information about SSUs, see Servicing stack updates and Servicing Stack Updates (SSU): Frequently Asked Questions.

If you are using Windows Update, the latest SSU (KB4566785) will be offered to you automatically. To get the standalone package for the latest SSU, search for it in the Microsoft Update Catalog.

Install this update

Release Channel

Available

Next Step

Windows Update or Microsoft Update

Yes

Go to Settings > Update & Security > Windows Update. In the Optional updates available area, you’ll find the link to download and install the update.

Microsoft Update Catalog

Yes

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

Windows Server Update Services (WSUS)

No

You can import this update into WSUS manually. See the Microsoft Update Catalog for instructions.

File information

For a list of the files that are provided in this update, download the file information for cumulative update 4568831

Note Some files erroneously have “Not applicable” in the “File version” column of the CSV file. This might lead to false positives or false negatives when using some third-party scan detection tools to validate the build.

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