Microsoft Security Update Summary (August 10, 2021)

Update[German]On August 10, 2021, Microsoft released security updates for Windows clients and servers, for Office, etc. – as well as for other products – were released. Below is a compact overview of these updates released on the August 2021 patchday.


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

Notes on the updates

Windows 10 version 2004, 20H2 and 21H1 share a common core and have an identical set of system files. Therefore, the same security update will be delivered for these Windows 10 versions. 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 tech community 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 enhancement measures. From Windows 10 version 2004 onward, Microsoft integrates the Servicing Stack Updates (SSUs) into the Latest Cumulative Updates (LCUs). A list of the latest SSUs can be found at ADV990001 (although the list is not always up to date).

Windows 7 SP1 is no longer supported as of 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. Updates for Windows RT 8.1 and Microsoft Office RT are only available through Windows Update.

Fixed vulnerabilities

The August 2021 security updates fix vulnerabilities (CVEs, 3 0-days, 44 vulnerabilities) in Microsoft products. A list of all covered CVEs can be found on this Microsoft page. The PrintNightmare vulnerability and the PetitPotam vulnerability have been mitigated. Qualys has published a list of all vulnerabilities patched in August 2021 on this website.


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Critical Security Updates

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 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 10 Version 21H1 for 32-bit Systems
Windows 10 Version 21H1 for ARM64-based Systems
Windows 10 Version 21H1 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 2004 (Server Core installation)
Windows Server, version 20H2 (Server Core Installation)
Windows Update Assistant

Important Security Updates

Microsoft 365 Apps for Enterprise for 32-bit Systems
Microsoft 365 Apps for Enterprise for 64-bit Systems
Microsoft Office 2019 for 32-bit editions
Microsoft Office 2019 for 64-bit editions
Microsoft Office 2019 for Mac
Microsoft SharePoint Enterprise Server 2013 Service Pack 1
Microsoft SharePoint Enterprise Server 2016
Microsoft SharePoint Server 2019
Microsoft Malware Protection Engine
Microsoft Visual Studio 2017 version 15.9 (includes 15.0 – 15.8)
Microsoft Visual Studio 2019 version 16.10 (includes 16.0 – 16.9)
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 16.9 (includes 16.0 – 16.8)
Visual Studio 2019 for Mac version 8.10
.NET 5.0
.NET Core 2.1
.NET Core 3.1
ASP.NET Core 2.1
ASP.NET Core 3.1
ASP.NET Core 5.0
Microsoft Dynamics 365 (on-premises) version 8.2
Microsoft Dynamics 365 (on-premises) version 9.0
Microsoft Dynamics 365 (on-premises) version 9.1
Microsoft Azure Active Directory Connect 1.6.4.0
Microsoft Azure Active Directory Connect 2.0.3.0
Azure CycleCloud 7.9.10
Azure CycleCloud 8.2.0
Azure Sphere

Similar article:
Microsoft Office Patchday (August 3, 2021)
Microsoft Security Update Summary (August 10, 2021)
Patchday: Windows 10-Updates (August 10, 2021)
Patchday: Updates for Windows 7/Server 2008 R2 (August 10, 2021)
Patchday: Windows 8.1/Server 2012-Updates (August 10, 2021)


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