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Microsoft Patch Tuesday, March 2021 Edition

Mar 10, 2021

Microsoft released updates to plug at least 82 security holes in its Windows operating systems and other software. Ten of the 82 vulnerabilities are marked as “critical”, meaning malware or miscreants could use them to seize remote control over unpatched systems with little or no help from users. 

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The March 2021 Patch Tuesday Security Updates

Security Updates are available for the following software:

  • Application Virtualization
  • Azure
  • Azure DevOps
  • Azure Sphere
  • Internet Explorer
  • Microsoft ActiveX
  • Microsoft Exchange Server
  • Microsoft Edge (Chromium-based)
  • Microsoft Graphics Component
  • Microsoft Office
  • Microsoft Office Excel
  • Microsoft Office PowerPoint
  • Microsoft Office SharePoint
  • Microsoft Office Visio
  • Microsoft Windows Codecs Library
  • Power BI
  • Role: DNS Server
  • Role: Hyper-V
  • Visual Studio
  • Visual Studio Code
  • Windows Admin Center
  • Windows Container Execution Agent
  • Windows DirectX
  • Windows Error Reporting
  • Windows Event Tracing
  • Windows Extensible Firmware Interface
  • Windows Folder Redirection
  • Windows Installer
  • Windows Media
  • Windows Overlay Filter
  • Windows Print Spooler Components
  • Windows Projected File System Filter Driver
  • Windows Registry
  • Windows Remote Access API
  • Windows Storage Spaces Controller
  • Windows Update Assistant
  • Windows Update Stack
  • Windows UPnP Device Host
  • Windows User Profile Service
  • Windows WalletService
  • Windows Win32K


Information about the updates:

  • Windows 10 updates are cumulative. The monthly security release includes all security fixes for vulnerabilities that affect Windows 10, in addition to non-security updates. The updates are available via the Microsoft Update Catalog. For information on lifecycle and support dates for Windows 10 operating systems, please see Windows Lifecycle Facts Sheet.
  • Microsoft is improving Windows Release Notes. For more information, please see What’s next for Windows release notes.
  • A list of the latest servicing stack updates for each operating system can be found in ADV990001. This list will be updated whenever a new servicing stack update is released. It is important to install the latest servicing stack update.
  • In addition to security changes for the vulnerabilities, updates include defense-in-depth updates to help improve security-related features.
  • Customers running Windows 7, Windows Server 2008 R2, or Windows Server 2008 need to purchase the Extended Security Update to continue receiving security updates. See 4522133 for more information.


The following KBs contain information about known issues with the security updates.

5000802 Windows 10, Version 2004, Windows Server, Version 2004
5000803 Windows 10, Version 1607, Windows Server 2016
5000808 Windows 10, Version 1909, Windows Server, Version 1909
5000822 Windows 10, Version 1809, Windows Server 2019
5000840 Windows Server 2012 (Security-only update)
5000841 Windows 7, Windows Server 2008 R2 (Monthly Rollup)
5000844 Windows Server 2008 (Monthly Rollup)
5000847 Windows Server 2012 (Monthly Rollup)
5000848 Windows 8.1, Windows RT 8.1, Windows Server 2012 R2 (Monthly Rollup)
5000851 Windows 7, Windows Server 2008 R2 (Security-only update)
5000853 Windows 8.1, Windows RT 8.1, Windows Server 2012 R2 (Security-only update)
5000856 Windows Server 2008 (Security-only update)
5000871 Microsoft Exchange Server 2019, 2016 and 2013
5000978 Microsoft Exchange Server 2010


More Information:

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