KB4598242 – Windows 10 version 20H1 and 20H2 Security Update

Microsoft releases the first cumulative update of this year for Windows 10 20H1 and 20H2 users on 12th January 2021. After applying the security patch i.e. KB4598242, the build numbers of Windows 10 versions 2004 and 2009 increase to 19041.746 and 19042.746 respectively. 

With this cumulative update, the company aims to resolve two vulnerability issues along with providing security updates to Windows 10 apps and components. As usual, you may get this patch update via Windows Update, Update Catalog, and WSUS. 


KB4598242 Changelog

Here are the key changes of this security patch –

  • Worked upon a security vulnerability issue with HTTPS-based intranet servers. Previously, this bug exists just because after installing the security patch, the Https-based intranet servers can’t take the help of a proxy to detect updates. 
  • The company had previously noted down a vulnerability issue when users try to authenticate the remote Windspool feature using the Printer Remote Procedure Call (RPC) binding. Microsoft has fixed this issue on Build 19041.746 and 19042.746.
  • Provides security updates to the following –

Windows App Platform and Frameworks, Windows Media, Windows Fundamentals, Windows Kernel, Windows Cryptography, Windows Virtualization, Windows Peripherals, and Windows Hybrid Storage Services.

Known Issues on KB4598242 

Here are the key known bugs on this security update –

1] Japanese Input Method editor may fail to work effectively:

Usually, this issue arises when you try pressing the Kanji characters on an app that automatically allows the input of Furigana characters. Mostly, the affected applications are known to be using the ImmGetCompositionString() function.

Sol: As of now, Microsoft is working on a resolution to fix this bug. When the developer does find any solution, they will put the same in an upcoming release. 

2] Loss of System and User Certificates:

A handful of users complained about losing the system as well as user certificates after upgrading Windows 10 1809 or later versions to Windows 10 20h1 or 20h2.

Sol: In order to avoid getting this bug, you may pre-download and install the latest servicing stack. Only after successfully installing the SSU, you may download and install the latest cumulative update. 

How to Get this Security Update 

To obtain this security patch on your computer, try out any one of the following methods –

Note: Make sure to download and install the latest servicing stack beforehand i.e. KB4598481.

1] Windows Update

Reach out to the below location and hit the Check for Updates option. 

Settings (Win + I) > Update & Security > Windows Update

2] Microsoft Update Catalog

  • Visit the official site, pick the update that best matches your system architecture, and hit the Download button.
  • Subsequently, click the top link to start downloading the related files of KB4598242.
  • When the download completes, open the folder containing this file, and double-click the setup file having .msu file extension. 

3] Windows Server Update Services

Set the following parameters as the following on your device and Windows 10 will update automatically.

  • Product: Windows 10, version 1903 and later
  • Classification: Security Updates

Release Note