Windows 10: December patch KB5021233 triggers crashes

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The update KB5021233 for Windows 10 released on Patch Day December causes problems: In the official Microsoft forum, user reports about a system crash after the update was installed are piling up.


Windows 10: blue screen with QR code
Windows 10: Microsoft has already provided a workaround for the KB5021233 issue.

The Microsoft Patch Day December that took place last week has an aftermath: in the official feedback forums the company’s update KB5021233, user reports are piling up that the update leads to the notorious “Blue Screen of Death” (BSOD) and the corresponding system no longer boots. Instead, the code 0xc000021a is output as an error message.

As the forum posts go on to explain, various recovery measures have not been successful. Microsoft itself has now also spoken out about the faulty KB5021233 patch and says that the company is aware of the problem. For example, the security update would cause incorrect synchronization of the hidparse.sys file within the System32 and associated driver folders on some devices. Microsoft provides the following steps to solve the problem:

Windows 10 KB5021233: How to fix the 0xc000021a error

  1. After several failed attempts to start the desktop, your device is in the Windows recovery environment.
  2. On the blue screen, select the “Troubleshoot” button.
  3. Select “Start recovery, troubleshooting and diagnostic tools”.
  4. Select “Advanced Options” and “Command Prompt”.
  5. Restart your device (this should happen automatically).
  6. You will see the command prompt window, but it will only appear after you have logged into your device with your password.
  7. Run the following command: “xcopy C:windowssystem32drivershidparse.sys C:windows\system32hidparse.sys”
  8. Reboot your system.
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After that, the 0xc000021a error should no longer appear in Windows 10. It is not yet known whether Microsoft will make the KB5021233 patch available for download again in a revised version. The update was originally intended to fix some bugs in the camera app in addition to the usual security updates – the full changelog can be found on the official one Microsoft website.

12/20/2022 from
Yusuf Hatic

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