Microsoft Security Update Summary (March 9, 2021)

[German]On March 9, 2021, Microsoft has released security updates for Windows clients and servers, for Office, Internet Explorer, and so on. Below is a compact overview of these updates.


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A list of the updates can be found on this Microsoft page. Details about the update packages for Windows, Office, etc. are available in separate blog posts.

Notes on the updates

Windows 10 version 1903 and 1909 and 2004 and 20H2 share a common core and have an identical set of system files. Therefore, the same security updates are delivered for Windows 10 version 190x and Windows 10 2004/20H2. Information on how to enable the features of Windows 10 version 1909 as well as 20H2, which is done through an Enablement Package update, can be found in this Techcommunity post.  

All Windows 10 updates are cumulative. The monthly Patchday update includes all security fixes for Windows 10 and all non-security fixes through Patchday. In addition to vulnerability security patches, the updates include security improvement measures. Last month, Microsoft began including Servicing Stack Updates (SSUs) in Latest Cumulative Updates (LCU). However, this currently only applies to the latest builds. A list of the current SSUs can be found under ADV990001  (although the list is not always up to date). 

Windows 7 SP1 is no longer supported since January 2020. Only customers with a 2nd year ESU license (or bypasses) will still receive updates. With the current ESU bypass lets install the update. Updates can also be downloaded from the Microsoft Update Catalog. The updates for Windows RT 8.1 and Microsoft Office RT are only available via Windows Update.

Vulnerabilities fixed

The March 2021 security updates cover 89 (82 now and 7 in early March) vulnerabilities (CVEs) in Microsoft products such as Microsoft Windows, Edge, Exchange Server, Microsoft Office, etc. Of these vulnerabilities, 14 are rated critical and 75 are rated important in severity. According to Microsoft, two of these vulnerabilities are listed as publicly known, while five are listed as actively attacked at the time of publication. A list of all security updates including CVEs can be found on the Zero Day Initiative blog as well as Bleeping Computer (details are covered separately in blog posts). 


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Critical Security Updates

Microsoft Edge (Chromium-based)
Microsoft Edge (EdgeHTML-based)
Internet Explorer 11
Windows 10 for 32-bit Systems
Windows 10 for x64-based Systems
Windows 10 Version 1607 for 32-bit Systems
Windows 10 Version 1607 for x64-based Systems
Windows 10 Version 1803 for 32-bit Systems
Windows 10 Version 1803 for ARM64-based Systems
Windows 10 Version 1803 for x64-based Systems
Windows 10 Version 1809 for 32-bit Systems
Windows 10 Version 1809 for ARM64-based Systems
Windows 10 Version 1809 for x64-based Systems
Windows 10 Version 1909 for 32-bit Systems
Windows 10 Version 1909 for ARM64-based Systems
Windows 10 Version 1909 for x64-based Systems
Windows 10 Version 2004 for 32-bit Systems
Windows 10 Version 2004 for ARM64-based Systems
Windows 10 Version 2004 for x64-based Systems
Windows 10 Version 20H2 for 32-bit Systems
Windows 10 Version 20H2 for ARM64-based Systems
Windows 10 Version 20H2 for x64-based Systems
Windows 8.1 for 32-bit systems
Windows 8.1 for x64-based systems
Windows RT 8.1
Windows Server 2012
Windows Server 2012 (Server Core installation)
Windows Server 2012 R2
Windows Server 2012 R2 (Server Core installation)
Windows Server 2016
Windows Server 2016  (Server Core installation)
Windows Server 2019
Windows Server 2019  (Server Core installation)
Windows Server, version 1909 (Server Core installation)
Windows Server, version 2004 (Server Core installation)
Windows Server, version 20H2 (Server Core Installation)
Windows Admin Center
Azure Container Instance
Azure Container Registry
Azure Kubernetes Service
Azure Service Fabric
Azure Sphere
Azure Spring Cloud
Microsoft Visual Studio 2017 version 15.9 (includes 15.0 – 15.8)
Microsoft Visual Studio 2019 version 16.4 (includes 16.0 – 16.3)
Microsoft Visual Studio 2019 version 16.7 (includes 16.0 – 16.6)
Microsoft Visual Studio 2019 version 16.8 (includes 16.0 – 16.7)
Microsoft Visual Studio 2019 version 16.9 (includes 16.0 – 16.8)
Visual Studio Code
Microsoft Visual Studio Code ESLint extension
Microsoft Quantum Development Kit for Visual Studio Code
Visual Studio Code – Java Extension Pack
Visual Studio Code  Remote – Containers Extension
HEVC Video Extensions

Important Security Updates

Microsoft 365 Apps for Enterprise for 32-bit Systems
Microsoft 365 Apps for Enterprise for 64-bit Systems
Microsoft Business Productivity Servers 2010 Service Pack 2
Microsoft Excel 2010 Service Pack 2 (32-bit editions)
Microsoft Excel 2010 Service Pack 2 (64-bit editions)
Microsoft Excel 2013 RT Service Pack 1
Microsoft Excel 2013 Service Pack 1 (32-bit editions)
Microsoft Excel 2013 Service Pack 1 (64-bit editions)
Microsoft Excel 2016 (32-bit edition)
Microsoft Excel 2016 (64-bit edition)
Microsoft Office 2010 Service Pack 2 (32-bit editions)
Microsoft Office 2010 Service Pack 2 (64-bit editions)
Microsoft Office 2013 RT Service Pack 1
Microsoft Office 2013 Service Pack 1 (32-bit editions)
Microsoft Office 2013 Service Pack 1 (64-bit editions)
Microsoft Office 2016 (32-bit edition)
Microsoft Office 2016 (64-bit edition)
Microsoft Office 2019 for 32-bit editions
Microsoft Office 2019 for 64-bit editions
Microsoft Office 2019 for Mac
Microsoft Office Online Server
Microsoft Office Web Apps 2013 Service Pack 1
Microsoft Office Web Apps Server 2013 Service Pack 1
Microsoft PowerPoint 2010 Service Pack 2 (32-bit editions)
Microsoft PowerPoint 2010 Service Pack 2 (64-bit editions)
Microsoft PowerPoint 2013 RT Service Pack 1
Microsoft PowerPoint 2013 Service Pack 1 (32-bit editions)
Microsoft PowerPoint 2013 Service Pack 1 (64-bit editions)
Microsoft PowerPoint 2016 (32-bit edition)
Microsoft PowerPoint 2016 (64-bit edition)
Microsoft SharePoint Enterprise Server 2016
Microsoft SharePoint Foundation 2013 Service Pack 1
Microsoft SharePoint Server 2019
Microsoft Visio 2010 Service Pack 2 (32-bit editions)
Microsoft Visio 2010 Service Pack 2 (64-bit editions)
Microsoft Visio 2013 Service Pack 1 (32-bit editions)
Microsoft Visio 2013 Service Pack 1 (64-bit editions)
Microsoft Visio 2016 (32-bit edition)
Microsoft Visio 2016 (64-bit edition)
Power BI Report Server version 15.0.1103.234
Power BI Report Server version 15.0.1104.300

Similar articles:
Microsoft Office Patchday (March 2, 2021)
Microsoft Security Update Summary (March 9, 2021)


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