Microsoft Security Update Summary (January 12, 2021)

[German]On January 12, 2021, Microsoft released security updates for Windows clients and servers, for Office, Internet Explorer, and so on. Here is a concise overview of these updates.A list of updates can be found on this Microsoft page. Details about the update packages for Windows, Office, etc. are available in separate blog posts.


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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 postdiesem Techcommunity-Beitrag.

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 enhancement measures. New servicing stack updates (SSDs) will be announced under ADV990001.

Windows 7 SP1 is no longer supported as of January 2020. Only customers with an ESU license (or bypass measures) will still receive updates. The current ESU bypass allows the update to be installed. Updates can also be downloaded from theMicrosoft Update Catalog. The updates for Windows RT 8.1 and Microsoft Office RT are only available through Windows Update.

Fixed vulnerabilities

The January 2021 security updates cover 83 vulnerabilities (CVEs) in Microsoft products like Microsoft Windows, Edge, Microsoft Office etc. One is a 0-day, 10 are rated critical, and 73 are rated important. 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).

Critical Security Updates

Microsoft Edge (EdgeHTML-based)
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)
Microsoft Security Essentials
Microsoft System Center 2012 Endpoint Protection
Microsoft System Center 2012 R2 Endpoint Protection
Microsoft System Center Endpoint Protection
Windows Defender
HEVC Video Extensions
Microsoft Remote Desktop
Remote Desktop client for Windows Desktop
Microsoft Remote Desktop for Android
Microsoft Azure Kubernetes Service


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Important Security Updates

Excel Services
Microsoft 365 Apps for Enterprise for 32-bit Systems
Microsoft 365 Apps for Enterprise for 64-bit Systems
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 2010 Service Pack 2
Microsoft Office Web Apps Server 2013 Service Pack 1
Microsoft SharePoint Enterprise Server 2013 Service Pack 1
Microsoft SharePoint Enterprise Server 2016
Microsoft SharePoint Foundation 2010 Service Pack 2
Microsoft SharePoint Foundation 2013 Service Pack 1
Microsoft SharePoint Server 2010 Service Pack 2
Microsoft SharePoint Server 2019
Microsoft Word 2010 Service Pack 2 (32-bit editions)
Microsoft Word 2010 Service Pack 2 (64-bit editions)
Microsoft Word 2013 RT Service Pack 1
Microsoft Word 2013 Service Pack 1 (32-bit editions)
Microsoft Word 2013 Service Pack 1 (64-bit editions)
Microsoft Word 2016 (32-bit edition)
Microsoft Word 2016 (64-bit edition)
Microsoft Visual Studio 2015 Update 3
Microsoft Visual Studio 2017 version 15.9 (includes 15.0 – 15.8)
Microsoft Visual Studio 2019 version 16.0
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
Microsoft SQL Server 2012 for 32-bit Systems Service Pack 4 (QFE)
Microsoft SQL Server 2012 for x64-based Systems Service Pack 4 (QFE)
Microsoft SQL Server 2014 Service Pack 3 for 32-bit Systems (CU 4)
Microsoft SQL Server 2014 Service Pack 3 for 32-bit Systems (GDR)
Microsoft SQL Server 2014 Service Pack 3 for x64-based Systems (CU 4)
Microsoft SQL Server 2014 Service Pack 3 for x64-based Systems (GDR)
Microsoft SQL Server 2016 for x64-based Systems Service Pack 2 (GDR)
Microsoft SQL Server 2016 Service Pack 2 for x64-based Systems (CU 15)
Microsoft SQL Server 2017 for x64-based Systems (CU 22)
Microsoft SQL Server 2017 for x64-based Systems (GDR)
Microsoft SQL Server 2019 for x64-based Systems (CU 8)
Microsoft SQL Server 2019 for x64-based Systems (GDR)
ASP.NET Core 3.1
ASP.NET Core 5.0
Bot Framework SDK for .NET Framework
Bot Framework SDK for JavaScript
Bot Framework SDK for Python

Similar articles
Microsoft Office Patchday (January 5, 2021)
Microsoft Security Update Summary (January 12, 2021)
Patchday: Windows 10-Updates (January 12, 2021)
Patchday: Updates für Windows 7/Server 2008 R2 (January 12, 2021)
Patchday: Windows 8.1/Server 2012-Updates (January 12, 2021)
Patchday Microsoft Office Updates (January 12, 2021)


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