February 11, 2020—KB4537776 (OS Build 10240.18486)

ID KB4537776
Type mskb
Reporter Microsoft
Modified 2020-02-11T08:00:00


None 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.


  • Updates to improve security when using Internet Explorer, Microsoft Edge, and input devices such as a mouse, keyboard, or stylus.
  • Updates for storing and managing files.
  • Updates to improve security when using external devices (such as game controllers and web cameras).
  • Updates to improve security when using Microsoft Office products.

Improvements and fixes

This security update includes quality improvements. Key changes include:

  • Addresses an issue that might prevent the “Turn off encryption support” Group Policy from being set correctly.
  • Security updates to the Internet Explorer, Windows Graphics, Windows Input and Composition, Windows Media, Windows Shell, Microsoft Edge, Windows Fundamentals, Windows Cryptography, Windows Hyper-V, Windows Peripherals, Windows Network Security and Containers, Windows Storage and Filesystems, the Microsoft Graphics Component, Windows Core Networking, and Windows Server. If you installed earlier updates, only the new fixes contained in this package will be downloaded and installed on your device.For more information about the resolved security vulnerabilities, please refer to the Security Update Guide.

Windows Update ImprovementsMicrosoft 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

Symptom| Workaround
Certain operations, such as rename, that you perform on files or folders that are on a Cluster Shared Volume (CSV) may fail with the error, “STATUS_BAD_IMPERSONATION_LEVEL (0xC00000A5)”. This occurs when you perform the operation on a CSV owner node from a process that doesn’t have administrator privilege.| After investigation, we have found that this issue does not affect this version of Windows.

How to get this update

Before installing this updateMicrosoft strongly recommends that 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 and applying Microsoft security fixes. 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 (KB4523200) 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 updateRelease Channel| Available| Next Step
Windows Update and Microsoft Update| Yes| None. This update will be downloaded and installed automatically from Windows Update.
Microsoft Update Catalog| Yes| To get the standalone package for this update, go to the Microsoft Update Catalog website.
Windows Server Update Services (WSUS)| Yes| This update will automatically sync with WSUS if you configure Products and Classifications as follows:Product: Windows 10Classification: Security Updates
File informationFor a list of the files that are provided in this update, download the file information for cumulative update 4537776.