Microsoft Releases Cumulative Update September 2020 For Windows 10 2004 and 20H2

As usual, every month Microsoft always releases Cumulative Update (Patch Tuesday) which contains various important bug fixes for all supported versions of Windows 10.

And related to this, this month September 2020, Microsoft released the KB4571756 update for Windows 10 May 2020 Update and Windows 10 Versions 20H2 users. Yes, they both get the same update, because once again it is worth remembering that Windows 10 20H2 is arguably the ‘cumulative update’ of Windows 10 2004 / 20H1.

The KB4571756 update that is sent will bring the OS Build to 19041.508 and 19042.508 for the respective versions of Windows 10, and of course there are some improvements provided, and here is the changelog of this update:


  • Updates to improve security when using input devices (such as a mouse, keyboard, or pen).
  • Updates to improve security when Windows performs basic operations.
  • Updates for storing and managing files.
  • Updates to improve security when using Microsoft Office products.


  • Addresses an issue with a possible elevation of privilege in windowmanagement.dll.
  • Addresses a security vulnerability issue with user proxies and HTTP-based intranet servers. After installing this update, HTTP-based intranet servers cannot leverage a user proxy by default to detect updates. Scans using these servers will fail if the clients do not have a configured system proxy. If you must leverage a user proxy, you must configure the behavior using the Windows Update policy “Allow user proxy to be used as a fallback if detection using system proxy fails.” This change does not affect customers who secure their Windows Server Update Services (WSUS) servers with the Transport Layer Security (TLS) or Secure Sockets Layer (SSL) protocols. For more information, see Ensuring clients stay secure, changes to scans against Windows Server Update Service (WSUS) servers.
  • Security updates to Windows App Platform and Frameworks, Microsoft Graphics Component, Windows Input and Composition, Windows Media, Windows Shell, Windows Cloud Infrastructure, Windows Fundamentals, Windows Management, Windows Kernel, Windows Virtualization, Windows Storage and File Systems, the Microsoft Scripting Engine , and the Microsoft JET Database Engine.

Meanwhile, the Known Issues, based on Microsoft’s official support page, are currently the same as before, namely issues related to IME in Japanese and Chinese.

“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. “

Although not many improvements are provided in this update, because this is a monthly cumulative update, it is recommended that users download and install it, you can go to Settings> Update & Security> Windows Update and click Check for updates.

Oh yes, the size of this update is around 360 MB for Windows 10 x64 and about 114 MB for Windows 10 x86, so prepare your internet quota.

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