After a long holiday leave, Windows 10 20H2 and 2004 has received security patch on Patch Tuesday. This KB4598242 LCU has a number of fixes and some significant improvements. It increases the build number of 2004 to 19041.746 and 20H2 to 19042.746.
You can download KB4598242 directly using default Windows update. Further, the system will ask you to install the same and restart the PC. Additionally, you can download the patch in the form of.MSU file format from Microsoft update catalog and install it manually.
Table of Contents
KB4598242 Windows 10 20H2 and 2004
Here is the changelog –
Improvements and fixes
- The LCU for Jan 21 addresses a security vulnerability issue with HTTPS-based intranet servers. After installing this update, HTTPS-based intranet servers cannot, by default, use a user proxy to detect updates. Scans using these servers will fail if you have not configured a system proxy on the clients. If you must use a user proxy, you must configure the behavior using the policy “Allow user proxy to be used as a fallback if detection using system proxy fails.” To ensure the highest levels of security, also use Windows Server Update Services (WSUS) Transport Layer Security (TLS) certificate pinning on all devices. This change does not affect customers who are using HTTP WSUS servers. For more information, see Changes to scans, improved security for Windows devices.
- The patch addresses a security bypass vulnerability that exists in the way the Printer Remote Procedure Call (RPC) binding handles authentication for the remote Winspool interface. For more information, see KB4599464.
- Rollout includes security updates to Windows Media, Windows Kernel, Windows Cryptography, Windows Virtualization, Windows Fundamentals, Windows Peripherals, Windows App Platform and Frameworks, and Windows Hybrid Storage Services.
Known issues
| Symptom | Workaround |
| User certificates and might be lost when updating a device from Windows 10 v1809 or greater to a later version of Windows 10. Devices will only be impacted if they have already installed any LCU rolled out on September 16, 2020 or later and then proceed to update to a later version of Windows 10 from media or an installation source which does not have an LCU released October 13, 2020 or later integrated. This initially happens when managed devices are updated using outdated bundles or media through an update management tool such as WSUS or Microsoft Endpoint Configuration Manager. The issue might also occur when using outdated physical media or ISO images that do not have the most recent updates integrated.
Important – Devices using Windows Update for Business or that connect straight to Windows Update are not impacted. Any device connecting to Windows Update should always get the latest versions of the feature update, including the LCU, without any additional steps. |
In case, you have already confronted this issue on your device, you can fix it within the uninstall window by going back to your previous version of Windows using the instructions here. The uninstall window might be 10 or 30 days based on the configuration of your environment and the version you’re updating to. You will then need to update to the greater version of Windows 10 after the issue is resolved in your environment. Note Within the uninstall window, you can increase the number of days you have to go back to your previous version of Windows 10 by using the DISM command /Set-OSUninstallWindow. You must make this change before the default uninstall window has lapsed. For more information, see DISM operating system uninstall command-line options. Microsoft is trying on a resolution and will provide updated bundles and refreshed media in the coming weeks. |
| When using the Microsoft Japanese IME to enter Kanji characters in an app that automatically allows the input of Furigana characters, you might not get the correct Furigana characters. You might need to enter the Furigana characters manually.
Important – The affected apps are using the ImmGetCompositionString() function. |
They are working on a resolution and will push an update in an upcoming release. |
How to download KB4598242 and install on Windows 20H2 and 2004
First of all, make sure to install the latest SSU KB4598481 and then follow any of the below methods –
1] Using Windows update
- Press the – Windows logo key.
- Type – update.
- Hit – Enter.
- Click – Check for updates.
- After the patch is fully downloaded click on the – Install.
- At, last, select – Restart now.
2] Through Microsoft update Catalog
- Go to the KB4598242 direct download link – Microsoft update catalog.
- Find the file matching with your system architecture (x86, x64, ARM)
- Click the – Download.
- Once the download process ends, double click the file.
- Follow the onscreen instructions until the patch is completely installed.