As always, we always recommend to wait for a while and take a backup of your important files before installing the updates. There is no guarantee from Microsoft that the updates will be installed smoothly on the computer. Although Microsoft does extensive testing before releasing the updates, it is possible that the update may make your computer unusable. In this article, we will mostly talk about Windows 10 cumulative updates for July 2021.

KB5004237

Since Windows 10 Version 2004, Version 20H2 and Version 21H1 share the same core Operating System, their updates are similar. This is the same update KB5004237 has been released for all three Windows 10 versions. KB5004237 fixes a bunch of serious security flaws in Windows 10. A total of 68 vulnerabilities have been fixes in which 4 are critical and 64 are important. The four critical vulnerabilities include the following:

Print Spooler Remote Code ExecutionMSHTML Platform Remote Code ExecutionHyper-V Remote Code ExecutionScripting Engine Memory Corruption

When we look at the Microsoft support page, they specify the following as highlights:

Updates regarding the verification of usernames and passwords.Updates designed to enhance the security of Windows when it performs basic functions.This update resolves a printing problem with certain printers. This issue affects a variety of models and brands, but primarily printers that are connected via a USB port.

Other fixes and updates include the following:

Added enforcement mode for CVE-2020-17049. Removes support for the PerformTicketSignature setting. Provides Advanced Encryption Standard (AES) encryption protection.Fixes a vulnerability in which Primary Refresh Tokens are not strongly encrypted. The tokens could be reused until they expire or are renewed. Security updates to Windows Apps, Windows Management, Windows Fundamentals, Windows Authentication, Windows User Account Control (UAC), Operating System Security, Windows Virtualization, Windows Linux, Windows Kernel, Microsoft Scripting Engine, Windows HTML Platform, Windows MSHTML Platform, and Windows Graphics.

After installing this update, the updated OS build for all three Windows versions will become:

Windows 10 Version 21H1 » 19043.1110Windows 10 Version 20H2 » 19042.1110Windows 10 Version 2004 » 19041.1110

KB5004245

KB5004245 has been released for Windows 10 Version 1909. You can check out the support page for information from Microsoft. Since Windows 10 Version 1909 has already reached the end of service on May 11, 2021, you may expect it to be less secure than the later versions. Although Windows 10 Version 21H1 is the latest version of stable Windows, you can also try out Windows 11, the upcoming version of Windows. KB5004245 fixes almost identical vulnerabilities like KB5004237.

Updates to verify usernames and passwords.Updates to improve security when Windows performs basic operations. 

Adds Advanced Encryption Standard (AES) encryption protections for CVE-2021-33757.Security updates to Windows Apps, Windows Management, Windows Fundamentals, Windows Authentication, Windows User Account Control (UAC), Operating System Security, Windows Virtualization, Windows Linux, Windows Kernel, the Microsoft Scripting Engine, the Windows HTML Platform, the Windows MSHTML Platform, and Windows Graphics.

Download offline installers

These updates can also be installed on any computer that has the relevant version of Windows 10, without having an internet connection. Download the offline installers below as per your Windows 10 version and platform requirements:

For Windows 10 Version 21H1

Download KB5004237 for Windows 10 Version 21H1 64-Bit [587.6 MB] Download KB5004237 for Windows 10 Version 21H1 32-Bit [271.3 MB]

For Windows 10 Version 20H2

Download KB5004237 for Windows 10 Version 20H2 64-Bit [587.6 MB] Download KB5004237 for Windows 10 Version 20H2 32-Bit [271.3 MB]

For Windows 10 Version 1909

Download KB5004245 for Windows 10 Version 1909 64-Bit [526.3 MB] Download KB5004245 for Windows 10 Version 1909 32-Bit [327.2 MB] To install the update, simply run the downloaded MSU file and Windows will automatically install the cumulative update. You can check out your current Windows build by launching Run and then typing winver. To download any other updates related to any of the above, please check the Microsoft Catalog.

Uninstall the cumulative updates

Here is a quick guide on how you can uninstall the updates on your computer if you face any issues with them:

Uninstall updates using Windows Update History tool

Uninstall updates using command-line

You can also delete the update by entering several commands in the Command Prompt. Here is how: Restart your computer once the update is uninstalled.

Cleanup after installing Windows Updates

If you want to save space after installing Windows updates, you can run the following commands: Also see:

Download KB5000802 Cumulative Update For Windows 10 20H2 and 2004Download KB5000808 Cumulative Update For Windows 10 Version 1909 18363.1440Download And Install KB4565351 Windows 10 Cumulative Update For August 2020 [Version 1909, 1903]Download And Install KB4566782 Windows 10 Cumulative Update For August 2020 [Version 2004]Download And Install KB4565503 Windows 10 Cumulative Update For July 2020 [Version 2004]