Understanding KB5021237 Known Issues: What You Need to Know

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If you’re an IT professional or a Windows user, you may have heard about the KB5021237 update, which was released by Microsoft on November 10, 2020, as part of the monthly security updates. While the update was intended to fix various security vulnerabilities in the Windows operating system, it has caused some issues that have affected a significant number of users. In this article, we’ll delve deeper into the known issues associated with KB5021237 and explore possible solutions.

What is KB5021237?

KB5021237 is a security update for Windows 10 and Windows Server 2019, designed to address several vulnerabilities in the operating system, including remote code execution, elevation of privilege, and denial of service attacks. The update was released as part of the Patch Tuesday update cycle, which occurs on the second Tuesday of every month.

What are the Known Issues with KB5021237?

Unfortunately, the KB5021237 update has caused some issues for users. Here are some of the most common issues that have been reported:

  1. Compatibility issues with some third-party software: Some users have reported that after installing KB5021237, some third-party software may not work correctly. This issue has been reported with software such as antivirus programs, VPN clients, and backup software.
  2. Blue Screen of Death (BSOD) errors: Several users have reported that after installing KB5021237, they have encountered BSOD errors that cause their system to crash. The errors are often caused by a problem with the “win32kfull.sys” file.
  3. Audio problems: Some users have reported that after installing KB5021237, they have experienced audio problems, such as audio distortion or no sound at all.
  4. Network connectivity issues: Some users have reported that after installing KB5021237, their network connectivity has been affected, resulting in slow internet speeds or loss of connectivity.

How to Fix the KB5021237 Known Issues?

If you’re experiencing any of the above issues, there are several things you can do to fix them. Here are some possible solutions:

  1. Uninstall KB5021237: If you’re experiencing issues after installing KB5021237, you can try uninstalling the update to see if it resolves the problem. To do this, go to Settings > Update & Security > Windows Update > View update history > Uninstall updates. Select KB5021237 from the list and click Uninstall.
  2. Update third-party software: If you’re experiencing compatibility issues with third-party software, you should check with the software vendor for an updated version that is compatible with KB5021237.
  3. Update drivers: Updating your drivers can help resolve many issues, including audio and network connectivity problems. Check with your hardware manufacturer for updated drivers that are compatible with KB5021237.
  4. Contact Microsoft support: If you’ve tried the above solutions and are still experiencing issues, you may need to contact Microsoft support for further assistance.

Conclusion

KB5021237 was released with the intention of fixing various security vulnerabilities in the Windows operating system. However, it has caused some issues for users, including compatibility issues with third-party software, BSOD errors, audio problems, and network connectivity issues. If you’re experiencing any of these issues, you can try uninstalling the update, updating third-party software and drivers, or contacting Microsoft support. It’s essential to stay informed about known issues with Windows updates and take the necessary steps to mitigate any potential problems.

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