The Microsoft March 2021 security updates have been released and consist of 89 CVEs, including the seven Exchange CVEs released last week. Of these 89 CVEs, 14 are rated Critical and 75 are rated Important in severity. At the time of release, two of the bugs are listed as publicly known
and five are listed as under active attack.
The updates apply to the following products: Microsoft Windows components, Azure and Azure DevOps, Azure Sphere,
Internet Explorer and Edge (EdgeHTML), Exchange Server, Office and
Office Services and Web Apps, SharePoint Server, Visual Studio, and
Windows Hyper-V.
Important Note For Windows 10, Version 2004 and Windows 10, Version 20H2:
Before installing this update
Prerequisite:
Microsoft now combines the latest servicing stack update (SSU) for your operating system with the latest cumulative update (LCU). If you encounter the error, 0x800f0823 – CBS_E_NEW_SERVICING_STACK_REQUIRED, close the error message and install the last standalone SSU (KB4598481) before installing this LCU. You will not need to install this SSU (KB4598481) again for future updates.
For general information about SSUs, see Servicing stack updates and Servicing Stack Updates (SSU): Frequently Asked Questions.
The KBs listed below contain information about known issues with the security updates:
| KB Article | Applies To |
|---|---|
| 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 |
Recommended Reading:
See Dustin Childs review and analysis in Zero Day Initiative -- The March 2021 Security Update Review.
For more information about the updates released today, see the Security Update Guide.
REMINDER: Adobe Flash Player is out of support. For more information, see Adobe Flash end of support on December 31, 2020. Flash content is blocked from running in Flash Player today, January 12, 2021. For more information, see Adobe Flash Player EOL General Information Page.
Additional Update Notes:
- MSRT -- The Malicious Software Removal Tool is now run on a quarterly basis rather than monthly. See Remove specific prevalent malware with Windows Malicious Software Removal Tool.
- Servicing Stack Updates -- A list of the latest servicing stack updates for each operating system can be found in ADV990001.
- 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 also available via the Microsoft Update Catalog.
- For information on lifecycle and support dates for Windows 10 operating systems, please see Windows Lifecycle Facts Sheet.
- Windows Update History:
References
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