OS Build 17763.1637
IMPORTANT As of 8/5/2021, this KB is no longer available from Windows Update, the Microsoft Update Catalog, or other release channels. We recommend that you update your devices to the latest security quality update.
IMPORTANT Adobe Flash Player will go out of support on December 31, 2020. For more information, see Adobe Flash end of support on December 31, 2020. Flash content will be blocked from running in Flash Player beginning January 12, 2021. For more information, see Adobe Flash Player EOL General Information Page.
For information about Windows update terminology, see the article about the types of Windows updates and the monthly quality update types. To view other notes and messages, see the Windows 10, version 1809 update history home page.
IMPORTANT Because of minimal operations during the holidays and the upcoming Western new year, there won’t be a preview release (known as a “C” release) for the month of December 2020. Normal monthly servicing for both B and C releases will resume in January 2021.
Note This release also contains updates for Microsoft HoloLens (OS Build 17763.1637) released December 8, 2020. Microsoft will release an update directly to the Windows Update Client to improve Windows Update reliability on Microsoft HoloLens that have not updated to this most recent OS Build.
Updates to improve security when using Microsoft Edge Legacy.
Updates to improve security when using Microsoft Office products.
Improvements and fixes
This security update includes quality improvements. Key changes include:
Security updates to Microsoft Edge Legacy, the Microsoft Graphics Component, Windows Media, Windows Fundamentals, and Windows Virtualization.
If you installed earlier updates, only the new fixes contained in this package will be downloaded and installed on your device.
For more information about the resolved security vulnerabilities, please refer to the new Security Update Guide website.
Windows Update Improvements
Microsoft has released an update directly to the Windows Update client to improve reliability. Any device running Windows 10 configured to receive updates automatically from Windows Update, including Enterprise and Pro editions, will be offered the latest Windows 10 feature update based on device compatibility and Windows Update for Business deferral policy. This doesn't apply to long-term servicing editions.
Known issues in this update
After installing KB4493509, devices with some Asian language packs installed may receive the error, "0x800f0982 - PSFX_E_MATCHING_COMPONENT_NOT_FOUND."
This issue is addressed by updates released June 11, 2019 and later. We recommend you install the latest security updates for your device. Customers installing Windows Server 2019 using media should install the latest Servicing Stack Update (SSU) before installing the language pack or other optional components. If using the Volume Licensing Service Center (VLSC), acquire the latest Windows Server 2019 media available. The proper order of installation is as follows:
Note Updating your device will prevent this issue, but will have no effect on devices already affected by this issue. If this issue is present in your device, you will need to use the workaround steps to repair it.
Note If reinstalling the language pack does not mitigate the issue, use the In-Place-Upgrade feature. For guidance, see How to do an in-place upgrade on Windows, and Perform an in-place upgrade of Windows Server.
How to get this update
Before installing this update
Microsoft strongly recommends you install the latest servicing stack update (SSU) for your operating system before installing the latest cumulative update (LCU). SSUs improve the reliability of the update process to mitigate potential issues while installing the LCU and applying Microsoft security fixes. For general information about SSUs, see Servicing stack updates and Servicing Stack Updates (SSU): Frequently Asked Questions.
Install this update
Windows Update and Microsoft Update
None. This update will be downloaded and installed automatically from Windows Update.
Microsoft Update Catalog
To get the standalone package for this update, go to the Microsoft Update Catalog website.
Windows Server Update Services (WSUS)
This update will automatically sync with WSUS if you configure Products and Classifications as follows:
Product: Windows 10
Classification: Security Updates
For a list of the files that are provided in this update, download the file information for cumulative update 4592440.
Note Some files erroneously have “Not applicable” in the “File version” column of the CSV file. This might lead to false positives or false negatives when using some third-party scan detection tools to validate the build.