Microsoft released security patches for all supported versions of its Windows operating system today on the October 2021 Patch Tuesday. The company released the first patch for Windows 11, the new version of Windows, which it releases last week, as well as for other client and server versions of the operating system.

Microsoft released updates for other company products as well, including .NET Core and Visual Studio, Active Directory Federation Services, and Microsoft Office.

Our overview of the October 2021 Patch Day provides you with essential information. It lists all released security updates and non-security updates, lists downloads and links to support patches, all known issues as reported by Microsoft, and other information that is relevant to making fast educated decisions when it comes to patching.

Click here to open the September 2021 Windows Patch Day overview here.

The Microsoft Windows Security Updates: September 2021

Click here to download an Excel spreadsheet that lists all released security updates: microsoft-windows-security-updates-october-2021

Executive Summary

All Windows 10 and 11 systems have patches for critical vulnerabilities.
Windows 11 has received its first update, KB5006674. It resolves a known issue with Intel networking software and the operating system.
Windows versions with known issues: Windows 7, Windows 8.1, Windows 10 version 1809, Windows 10 version 20H2, Windows Server 2019, Windows Server 2008 R2, Windows Server 2012

Operating System Distribution

Windows 7 (extended support only): 19 vulnerabilities: 0 critical and 19 important
Windows 8.1: 27 vulnerabilities: 0 critical and 27 important
Windows 10 version 1909: 37 vulnerabilities: 1 critical and 36 important

Windows Hyper-V Remote Code Execution Vulnerability — CVE-2021-40461

Windows 10 version 2004, 20H2 and 21H1 : 39 vulnerabilities, 1 critical and 38 important

Windows Hyper-V Remote Code Execution Vulnerability — CVE-2021-40461

Windows 11 39 vulnerabilities, 2 critical and 38 important

Windows Hyper-V Remote Code Execution Vulnerability — CVE-2021-40461
Windows Hyper-V Remote Code Execution Vulnerability — CVE-2021-38672

Windows Server products

Windows Server 2008 R2 (extended support only): 20 vulnerabilities: 0 critical and 20 important
Windows Server 2012 R2: 28 vulnerabilities: 0 critical and 28 important
Windows Server 2016: 33 vulnerabilities: 0 critical and 33 important
Windows Server 2019: 40 vulnerabilities: 1 critical and 39 important

Windows Hyper-V Remote Code Execution Vulnerability — CVE-2021-40461

Windows Server 2022:  43 vulnerabilities: 2 critical and 41 important

Windows Hyper-V Remote Code Execution Vulnerability — CVE-2021-40461
Windows Hyper-V Remote Code Execution Vulnerability — CVE-2021-38672

Windows Security Updates

Windows 7 SP1 and Windows Server 2008 R2

Monthly Rollup: KB5006743 
Security-Only: KB5006728 

Updates and improvements:

Addresses an issue in which an Internet print server cannot package the driver to send to the client.
Addresses an issue in which Security Account Manager (SAM) events are not displayed properly in the Event Viewer.
Adds a new Policy setting to ensure that only admins can install printer drivers on a print server. More information is available on this support page.

HKEY_LOCAL_MACHINESoftwarePoliciesMicrosoftWindows NTPrintersPointAndPrint
RestrictDriverInstallationToAdministrators
Value: 1

Adds the ability to configure period or dot (.) delimited IP addresses interchangeably with fully qualified host names in the following Group Policy settings:

Package Point and Print – Approved Servers
Point and Print Restrictions

It is unclear which of these are also included in the Security-Only update. Microsoft simply states:

This update contains miscellaneous security improvements to internal OS functionality. No additional issues were documented for this release.

Windows 8.1 and Windows Server 2012 R2

Monthly Rollup: KB5006714 
Security-only: KB5006729 

Updates and improvements:

Addresses an issue in which a user does not have a way to track DCOM activation failures on a server that is running Windows Server 2012 R2.
Addresses an issue in which an Internet print server cannot package the driver to send to the client.
Addresses an issue in which Security Account Manager (SAM) events are not displayed properly in the Event Viewer.
In Internet Explorer 11 for Windows 8.1 and Windows Server 2012 R2, certain circumstances might cause Enterprise Mode Site List redirection from Internet Explorer 11 to Microsoft Edge to open the site in multiple tabs in Microsoft Edge.
Adds a new Policy setting to ensure that only admins can install printer drivers on a print server. More information is available on this support page.

HKEY_LOCAL_MACHINESoftwarePoliciesMicrosoftWindows NTPrintersPointAndPrint
RestrictDriverInstallationToAdministrators
Value: 1

Adds the ability to configure period or dot (.) delimited IP addresses interchangeably with fully qualified host names in the following Group Policy settings:

Package Point and Print – Approved Servers
Point and Print Restrictions

It is unclear which of these are also included in the Security-Only update. Microsoft simply states:

This update contains miscellaneous security improvements to internal OS functionality. No additional issues were documented for this release.

Windows 10 version 1909

Support Page: KB5006667 

Updates and improvements:

Addresses an issue that prevents some applications, such as Microsoft Office and Adobe Reader, from opening or causes them to stop responding. This occurs on devices that are subject to Microsoft Exploit Protection for Export Address Filtering (EAF).

Windows 10 version 2004, 20H2 and 21H1

Support Page: KB5006670 

Updates and improvements:

Addresses an issue that prevents some applications, such as Microsoft Office and Adobe Reader, from opening or causes them to stop responding. This occurs on devices that are subject to Microsoft Exploit Protectionfor Export Address Filtering (EAF).

Windows 11

Support Page: KB5006674 

Updates and improvements:

Addresses known compatibility issues between some Intel “Killer” and “SmartByte” networking software and Windows 11 (original release). Devices with the affected software might drop User Datagram Protocol (UDP) packets under certain conditions. This creates performance and other issues for protocols based on UDP. For example, some websites might load slower than others on the affected devices, which might cause videos to stream slower in certain resolutions. VPN solutions based on UDP might also be slower.

Other security updates

2021-10 Cumulative Update for Windows 10 Version 1607 (KB5006669)

2021-10 Cumulative Update for Microsoft server operating system version 21H2 for x64-based Systems (KB5006699)

2021-10 Cumulative Security Update for Internet Explorer (KB5006671)

2021-10 Security Only Quality Update for Windows Server 2008 (KB5006715)

2021-10 Security Monthly Quality Rollup for Windows Server 2008 (KB5006736)

2021-10 Security Only Quality Update for Windows Embedded 8 Standard and Windows Server 2012 (KB5006732)

2021-10 Security Monthly Quality Rollup for Windows Embedded 8 Standard and Windows Server 2012 (KB5006739)

Servicing Stack Updates

2021-10 Servicing Stack Update for Windows Embedded Standard 7, Windows 7, and Windows Server 2008 R2 (KB5006749)

2021-10 Servicing Stack Update for Windows Server 2008 (KB5006750)

Known Issues

Windows 7 and Server 2008 R2

Updates may fail to install if the system is not an ESU system. Expected behavior.
Certain file operations may fail on cluster shared volumes.

Perform the operation from a process with elevated rights.
Perform the operation from a node that does not have CSV ownership.

Windows 8.1 and Server 2012 R2

Certain file operations may fail on cluster shared volumes.

Perform the operation from a process with elevated rights.
Perform the operation from a node that does not have CSV ownership.

Security advisories and updates

ADV 990001 — Latest Servicing Stack Updates

Non-security updates

2021-10 Security and Quality Rollup for .NET Framework 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2 for Windows 8.1 (KB5006064)

2021-10 Security and Quality Rollup for .NET Framework 4.8 for Windows Embedded 8 Standard and Windows Server 2012 (KB5006066)

2021-10 Cumulative Update for .NET Framework 3.5 and 4.8 for (KB5005537)

2021-10 Security and Quality Rollup for .NET Framework 3.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8 for Windows Embedded Standard 7, Windows 7, and Windows Server 2008 R2 (KB5006761)

2021-10 Security and Quality Rollup for .NET Framework 3.5, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8 for Windows Embedded 8 Standard and Windows Server 2012 (KB5006762)

2021-10 Security and Quality Rollup for .NET Framework 3.5, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8 for Windows 8.1 and Windows Server 2012 R2 (KB5006763)

2021-10 Security and Quality Rollup for .NET Framework 2.0, 3.0, 4.5.2, 4.6 and 4.6.2 for Windows Server 2008 (KB5006764)

2021-10 Security and Quality Rollup for .NET Framework 4.8 for Windows 8.1 and Windows Server 2012 R2 (KB5006067)

2021-10 Security and Quality Rollup for .NET Framework 4.8 for Windows Embedded Standard 7, Windows 7, and Windows Server 2008 R2 (KB5006060)

2021-10 Security and Quality Rollup for .NET Framework 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2 for Windows Embedded Standard 7, Windows 7, Windows Server 2008 R2, and Windows Server 2008 (KB5006061)

2021-10 Security and Quality Rollup for .NET Framework 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2 for Windows Embedded 8 Standard and Windows Server 2012 (KB5006063)

2021-10 Cumulative Update for .NET Framework 3.5 and 4.8 for Microsoft server operating system version 21H2 for ARM64 (KB5005538)

2021-10 Cumulative Update for .NET Framework 3.5 and 4.8 for Windows Server, version 20H2, Windows 10 Version 20H2, Windows Server, version 2004, Windows 10 Version 2004, Windows 10 Version 1909, and Windows 10 Version 1903 (KB5005539)

2021-10 Cumulative Update for .NET Framework 3.5 and 4.8 for Windows Server 2019 and Windows 10 Version 1809 (KB5005540)

2021-10 Cumulative Update for .NET Framework 3.5 and 4.8 for Windows 10 Version 1909 (KB5005541)

2021-10 Cumulative Update for .NET Framework 3.5 and 4.7.2 for Windows Server 2019 and Windows 10 Version 1809 (KB5005543)

2021-10 Cumulative Update for .NET Framework 4.8 for Windows Server 2016 and Windows 10 Version 1607 (KB5006065)

2021-10 Cumulative Update for .NET Framework 3.5 and 4.7.2 for Windows Server 2019 and Windows 10 Version 1809 (KB5006765)

Microsoft Office Updates

You find Office update information here.

How to download and install the October 2021 security updates

All released security updates for Windows are available via Windows Update, other update management systems, and as direct downloads. Windows 11 systems that don’t meet the minimal system requirements may install the update via Windows Update as well.

To run a check for updates, do the following on Windows devices:

Select Start, type Windows Update and load the Windows Update item that is displayed.
Select check for updates to run a manual check for updates.

Direct update downloads

Below are resource pages with direct download links, if you prefer to download the updates to install them manually.

Windows 7 and Server 2008 R2

KB5006743 — 2021-10 Security Monthly Quality Rollup for Windows 7
KB5006728 — 2021-10 Security Only Quality Update for Windows 7

Windows 8.1 and Windows Server 2012 R2

KB5006714 — 2021-10 Security Monthly Quality Rollup for Windows 8.1
KB5006729 — 2021-10 Security Only Quality Update for Windows 8.1

Windows 10 (version 1909)

KB5006667 — 2021-10 Cumulative Update for Windows 10 Version 1909

Windows 10 (version 2004)

KB5006670 — 2021-10 Cumulative Update for Windows 10 Version 2004

Windows 10 (version 20H2)

KB5006670 — 2021-10 Cumulative Update for Windows 10 Version 20H2

Windows 10 (version 21H1)

KB5006670  — 2021-10 Cumulative Update for Windows 10 Version 21H1

Windows 11

KB5006674 — 2021-10 Cumulative Update for Windows 11

Additional resources

October  2021 Security Updates release notes
List of software updates for Microsoft products
List of the latest Windows Updates and Services Packs
Security Updates Guide
Microsoft Update Catalog site
Our in-depth Windows update guide
How to install optional updates on Windows 10
Windows 10 Update History
Windows 8.1 Update History
Windows 7 Update History

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