Microsoft resolves issue that caused 0xc000021a bluescreen crashes

Microsoft addressed a problem that caused Blue Screen of Death crashes (BSOD), with 0xc000021a errors, after installing Windows 10 KB5021233 cumulative updates. This update was released on Tuesday, December Patch Tuesday.

This issue has been fixed by the Update, which was issued today to all Windows 10 version currently supported.

Redmond confirmed it after a series of user reports posted on Microsoft’s website [1, 2/3], and Reddit [1, 2/3], just one week following the release of KB5021233.

This problem is most likely due to a mismatch in hidparse.sys files in system32 and in system32/drivers within the Windows folder. “This might cause signature validation failure when cleanup takes place.”

Microsoft . They might get an error (0xc000021a), and a blue screen.

Only client Windows versions are included in the list, ranging from Windows 10 version 20H2 through Windows 10 version 22H2.

0xc000021a blue screen triggered after installing KB5021233 (


There are also workarounds available for the affected systems

Microsoft offers a temporary solution to the blue screen problem and allows users to restart impacted systems as normal.

To ensure the blue screen crash does not occur, affected users must copy the hidparse.sys files from system32drivers into system32 by using Windows Recovery Environment (WinRE).

These steps will help you apply the temporary solution.

  1. To enter Windows Recovery Environment, you will be required to Please see the Entry points to WinRE if your device is not starting up automatically.
  2. Click the Troubleshoot option.
  3. Click the button “Start Recovery, Troubleshooting and Diagnostic Tools”.
  4. Click the button “Advanced Options”.
  5. Click the “Command Prompt” button to wait for your device’s restart, if necessary.
  6. The Command Prompt window should appear on your device’s screen. Before you can access the Command Prompt, sign in with your password.
  7. Run the following command (Important: If Windows is not installed to C:windows you will need to modify the command to your environment): xcopy C:windowssystem32drivershidparse.sys C:windowssystem32hidparse.sys
  8. After the command is complete, press exit
  9. Click the button “Continue”.
  10. Windows will now begin as normal.

Microsoft stated that it is not recommended to use any other solution than that recommended by its support site.

Microsoft .