March 9, 2021—KB5000809 (OS Build 17134.2087)

12/8/20
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 1803 update history home page.

Highlights

• Updates security for the Windows user interface.
• Updates to improve security when Windows performs basic operations.
• Updates to improve security when using Microsoft Office products.

Improvements and fixes

This security update includes quality improvements. Key changes include:

• Addresses an elevation of privilege security vulnerability documented in CVE-2021-1640 related to print jobs submitted to “FILE:” ports. After installing Windows updates from March 9, 2021 and later, print jobs that are in a pending state before restarting the print spooler service or restarting the OS will remain in an error state. Manually delete the affected print jobs and resubmit them to the print queue when the print spooler service is online.
• Security updates to the Windows Shell, Windows User Account Control (UAC), Windows Fundamentals, Windows Core Networking, the Windows Kernel, the Microsoft Graphics Component, Windows Graphics, Internet Explorer, Microsoft Edge Legacy, and Windows Media.
  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.

Known issues in this update

• Elements of the document might print as solid black/color boxes or might be missing, including barcodes, QR codes, and graphics elements, such as logos.
• Table lines might be missing. Other alignment or formatting issues might also be present.
• Printing from some apps or to some printers might result in a blank page or label.
  | This issue is resolved in KB5001634.

How to get this update