Windows 10 KB5005565 & KB5005566 cumulative updates released

The September 2021 Patch Update is released and Microsoft is now rolling out new KB5005565 and KB5005566 cumulative updates for recent versions of Windows 10.

Today's cumulative updates include security fixes for PCs with May 2021 Update (version 21H1), October 2020 Update (version 20H2), and May 2020 Update (version 2004).

The update is now rolling out via Windows Update, WSUS, and the Microsoft Update Catalog with numerous bug fixes and performance enhancements.

The full list of today's cumulative updates is below:

Windows 10 version 1507 — KB5005569 (OS Build 10240.19060) Windows 10 version 1607 — KB5005573 (OS Build 14393.4651) Windows 10 version 1703 — EOS Windows 10 version 1709 — EOS Windows 10 version 1803 — EOS Windows 10 version 1809 — KB5005568 (OS Build 17763.2183) Windows 10 version 1903 — EOS Windows 10 version 1909 — KB5005566 (OS Build 18363.1801) Windows 10 version 2004, 20H2 and 21H1 — KB5005565 (OS Builds 19041.1237, 19042.1237, and 19043.1237)

Like every Patch Tuesday, you can check for and install new updates by going to Settings, clicking on Windows Update, and selecting 'Check for Updates' to install the updates.

If you own multiple PCs or if you would like to patch the PCs manually, you can learn more about how to do so here.

Today's Patch Tuesday updates also fix 60 security vulnerabilities, including a Windows MSHTML zero-day vulnerability tracked as CVE-2021-40444.

What's new in the KB5005565 cumulative update

With the KB5005565 update, Microsoft has addressed a bug that causes Bluetooth headsets to only work for voice calls and another bug that provides the wrong Furigana result when you cancel the Japanese reconversion.

The company has also updated an issue that resets syncing for Microsoft OneDrive to “Known folders only” after you install a Windows update.

After installing this update, Windows 10 2004 will be updated to build 19041.1237, Windows 10 20H2 will be updated to build 19042.1237, and Windows 10 21H1 will be updated to build 19043.1237.

This cumulative update comes with the following highlighted fixes:

Addresses an issue that causes PowerShell to create an infinite number of child directories. This issue occurs when you use the PowerShell Move-Item command to move a directory to one of its children. As a result, the volume fills up and the system stops responding.

Updates a rare condition that causes Bluetooth headsets to only work for voice calls.

Updates an issue that provides the wrong Furigana result when you cancel the Japanese reconversion.

Updates an issue that resets syncing for Microsoft OneDrive to “Known folders only” after you install a Windows update.

Updates an issue that prevents audio headsets that connect to a device using USB from working if the device has certain third-party audio drivers.

Updates an issue with resizing images that might produce flickering and residual line artifacts.

Updates an issue that prevents you from typing any words in the username box during the out-of-box experience (OOBE) process. This issue occurs when you use the Chinese Input Method Editor (IME).

Updates an issue with copying and pasting a text box into Office 365 apps. If you use an IME, you won’t be able to insert text into the text box.

Updates an issue that might cause your device to stop working when making a touch input gesture. This issue occurs if you bring more fingers into contact with the touchpad or screen during the middle of the gesture.

Updates an issue that might cause an external monitor to display a black screen after Hibernation. This issue might occur when the external monitor connects to a docking station using a certain hardware interface.

Updates an issue that resets the brightness for standard dynamic range (SDR) content on high-dynamic range (HDR) monitors. This occurs after you restart your device or reconnect to the device remotely. 

Windows 10 version 1909 is getting KB5005566 with identical fixes.