The first batch of security updates or ‘B’ updates for the month of ‘December 2020’ is now available for all supported versions of Windows 10 including version 20H2.
If you want to grab these updates, check for updates in the Settings and the update will begin installing. If you don’t want to grab these fixes, make sure that you hit the pause button. This is because Patch Tuesday cumulative updates are downloaded and installed automatically when you try to ignore them but don’t hit the pause optional.
Like every Patch Tuesday release, the cumulative update comes with security fixes and general bug fixes, and the patch is rolling out to PCs with October 2020 Update, May 2020 Update, November 2019 Update, and later (depending on the edition of Windows installed)
Below is the list of all new updates for Windows 10
- Windows 10 version 1507 — KB4592464 (OS Build 10240.18782)
- Windows 10 version 1607 — KB4593226 (OS Build 14393.4104)
- Windows 10 version 1703 — KB4592473 (OS Build 15063.2584)
- Windows 10 version 1709 — EOS
- Windows 10 version 1803 — KB4592446 (OS Build 17134.1902)
- Windows 10 version 1809 — KB4592440 (OS Build 17763.1637)
- Windows 10 version 1903/1909 — KB4592449 (OS Builds 18362.1256 and 18363.1256)
- Windows 10 version 2004 and 20H2 — KB4592438 (OS Builds 19041.685 and 19042.685)
To install the patch, head to the Settings app and click on the Windows Update option to install the patches. If you own multiple PCs or if you would like to patch the PCs manually, you can learn more about it here.
What’s new in OS Builds 19041.685 and 19042.685
The cumulative update for Windows 10, version 2004 and 20H2 is KB 4592438 and it comes with these fixes:
- Addresses a security vulnerability by preventing applications that run as a SYSTEM account from printing to “FILE:” ports. To address this issue in the future, make sure your applications or services run as a specific user or service account.
- Security updates to Microsoft Edge Legacy, the Microsoft Graphics Component, Windows Media, Windows Fundamentals, and Windows Virtualization.
- Updates to improve security when using Microsoft Edge Legacy.
- Updates to improve security when using Microsoft Office products.
Known issues in this update
| Symptom | Workaround |
| System and user certificates might be lost when updating a device from Windows 10, version 1809 or later to a later version of Windows 10. Devices will only be impacted if they have already installed any Latest cumulative update (LCU) released 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 primarily happens when managed devices are updated using outdated bundles or media through an update management tool such as Windows Server Update Services (WSUS) or Microsoft Endpoint Configuration Manager. This might also happen when using outdated physical media or ISO images that do not have the latest updates integrated.
Note Devices using Windows Update for Business or that connect directly to Windows Update are not impacted. Any device connecting to Windows Update should always receive the latest versions of the feature update, including the latest LCU, without any extra steps. |
If you have already encountered this issue on your device, you can mitigate 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 depending on the configuration of your environment and the version you’re updating to. You will then need to update to the later 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.
We are working on a resolution and will provide updated bundles and refreshed media in the coming weeks. |
| When using the Microsoft Japanese Input Method Editor (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.
Note The affected apps are using the ImmGetCompositionString() function. |
We are working on a resolution and will provide an update in an upcoming rele |
OS Builds 18362.1256 and 18363.1256
The cumulative update for Windows 10, version 1903 and 1909 is 18362.1256 and 18363.1256 respectively. It comes with these fixes:
- Addresses a security vulnerability by preventing applications that run as a SYSTEM account from printing to “FILE:” ports. To address this issue in the future, make sure your applications or services run as a specific user or service account.
- Security updates to Microsoft Edge Legacy, the Microsoft Graphics Component, Windows Media, Windows Fundamentals, and Windows Virtualization.