Microsoft released security updates for all supported versions of the Windows operating system and other company products, such as Microsoft Office, on December 14, 2021 Patch Day.
Updates are already available through Windows Update, WSUS, and other update management solutions, and as direct downloads from the Microsoft Update catalog.
Our guide contains links to all of the published support pages for the December 2021 security updates for Windows. It includes critical update information (with links), lists known issues, includes direct download links, and lists other updates released during Patch Tuesday in December 2021.
Microsoft Windows security updates: October 2021
The following Excel worksheet lists all the security updates for Windows that Microsoft released on the December 2021 patch day. Download it by clicking the following link: microsoft-windows-security-updates-December-2021
Summary
- Microsoft has released security updates for all supported versions of Windows
- Other Microsoft products with security updates include: Remote Desktop Client, Microsoft Defender for IoT, Azure Bot Framework SDK, Microsoft Office, Visual Studio Code, Microsoft PowerShell, Office Developer Platform.
- Microsoft has corrected six zero-day security vulnerabilities in its products.
- The following products have known issues:
- Client: Windows 10 version 1607, 1809, 2004, 20H2, 21H1, Windows 8.1, Windows 7
- Server: Server 2008, 2008 R2, 2012, 2012 R2, 2016, 2019, 2022
Operating system distribution
- Windows 7 (extended support only): 19 vulnerabilities: 3 critical and 16 important
- Remote Desktop Client Remote Code Execution Vulnerability – CVE-2021-43233
- Windows Encryption File System (EFS) Remote Code Execution Vulnerability – CVE-2021-43217
- ISNS Server Memory Corruption Vulnerability May Lead to Remote Code Execution – CVE-2021-43215
- Windows 8.1: 21 vulnerabilities: 3 critical and 18 important
- Windows 10 version 1909: 29 vulnerabilities: 3 critical and 26 important
- Windows 10 version 2004, 20H2, 21H1 and 21H2: 30 vulnerabilities, 3 critical and 27 important
- Windows 11: 28 vulnerabilities, 2 critical and 26 important
- Remote Desktop Client Remote Code Execution Vulnerability – CVE-2021-43233
- Windows Encryption File System (EFS) Remote Code Execution Vulnerability – CVE-2021-43217
Windows Server Products
- Windows Server 2008 R2 (extended support only): 18 vulnerabilities: 3 critical and 15 important
- Remote Desktop Client Remote Code Execution Vulnerability – CVE-2021-43233
- Windows Encryption File System (EFS) Remote Code Execution Vulnerability – CVE-2021-43217
- ISNS Server Memory Corruption Vulnerability May Lead to Remote Code Execution – CVE-2021-43215
- Windows Server 2012 R2: 21 vulnerabilities: 3 critical and 18 important
- same as Windows Server 2008 R2.
- To earndows server 2016: 22 vulnerabilities: 3 critical and 19 important
- same as Windows Server 2008 R2.
- Windows Server 2019: 27 vulnerabilities: 3 critical and 24 important
- same as Windows Server 2008 R2.
- Windows Server 2022: 29 vulnerabilities: 2 critical and 27 important
- Remote Desktop Client Remote Code Execution Vulnerability – CVE-2021-43233
- Windows Encryption File System (EFS) Remote Code Execution Vulnerability – CVE-2021-43217
Windows Security Updates
Windows 7 SP1 and Windows Server 2008 R2
Updates and Improvements:
- Fixes error codes 0x000006e4, 0x0000007c, or 0x00000709 caused by connecting to a shared remote printer on a Windows print server.
- Addresses a compatibility issue with some applications, including Kaspersky applications, that could prevent applications from opening after attempts to update the affected application or to repair it using Microsoft Installer.
- Daylight saving time canceled for 2021 for the Republic of Fiji.
- Security updates.
Windows 8.1 and Windows Server 2012 R2
Updates and Improvements:
Windows 10 version 1909
Updates and Improvements:
- Same as Windows 7 plus
- Addresses an unnamed issue in Internet Explorer that occurs when a dialog box opens.
- Fixes a variable font issue that made them incorrectly.
Windows 10 version 2004, 20H2, 21H1 and 21H2
Updates and Improvements:
Windows 11
Updates and Improvements:
Other security updates
2021-12 Security Only Quality Update for Windows Server 2008 (KB5008271)
2021-12 Security Monthly Quality Rollup for Windows Server 2008 (KB5008274)
2021-12 Security Only Quality Update for Windows Embedded 8 Standard and Windows Server 2012 (KB5008255)
2021-12 Security Monthly Quality Rollup for Windows Embedded 8 Standard and Windows Server 2012 (KB5008277)
2021-12 Cumulative Update for Windows 10 Version 1607 (KB5008207)
2021-12 Dynamic Cumulative Update for Windows Server, Version 20H2, Windows 10 Version 20H2, Windows 10 Version 2004, Windows 10 Version 1909, Windows 10 Version 1903, Windows 10 Version 1809, and Windows 10 Version 1607 (KB5008212)
2021-12 Cumulative Update for Windows Server 2019 and Windows 10 Version 1809 (KB5008218)
2021-12 Cumulative Update for Microsoft Server Operating System Version 21H2 for x64-based Systems (KB5008223)
Known issues
Windows 7 SP1 and Windows Server 2008 R2
- Updates may appear to have failed and may be uninstalled because the machine is not on ESU.
- Some operations such as renaming may fail on cluster shared volumes.
- Perform the operation from a process with administrator privileges.
- Perform the operation from a node that does not have the CSV property.
Windows 8.1 and Server 2012 R2
- Some operations such as renaming may fail on cluster shared volumes.
- Perform the operation from a process with administrator privileges.
- Perform the operation from a node that does not have the CSV property.
Windows 10 versions 2004, 20H2, 21H1 and 21H2
- Custom installations may not receive the new Microsoft Edge web browser, while the old version may be removed.
- Some devices cannot install updates after installing KB5003690 (June 21, 2021). The PSFX_E_MATCHING_BINARY_MISSING error is displayed.
- Workaround instructions are available here.
- Connections may fail authentication when using smart card authentication in Remote Desktop connections.
- Solved according to Microsoft, should no longer be experienced.
Security advisories and updates
ADV 990001 – Latest Servicing Stack Updates
Non-security updates
2021-12 Dynamic Update for Microsoft Server Operating System for x64-based Systems (KB5009340)
Microsoft Office Updates
You can find information about updating Office here.
How to download and install the December 2021 security updates
Personal computers and devices automatically receive updates through Windows Update. Organizations can use update management solutions such as WSUS to distribute updates.
Windows administrators can run manual update checks to install updates earlier. Another option is to download updates manually to install them that way.
Here’s how to manually check for updates:
- Select Start, type Windows Update, and load the Windows Update item that appears.
- Select Check for updates to run a manual check for updates.
Direct updates downloads
Below are resource pages with direct download links, if you prefer to download updates and install them manually.
Windows 7 and Server 2008 R2
- KB5008244 – 2021-12 Security Monthly Quality Rollup for Windows 7
- KB5008282 – 2021-12 Security Only Quality Update for Windows 7
Windows 8.1 and Windows Server 2012 R2
- KB5008263 – 2021-12 Security Monthly Quality Rollup for Windows 8.1
- KB5008285 – 2021-12 Security Only Quality Update for Windows 8.1
Windows 10 (version 1909)
- KB5008206 – 2021-12 cumulative update for Windows 10 Version 1909
Windows 10 (2004 version)
- KB5008212 – 2021-12 cumulative update for Windows 10 Version 2004
Windows 10 (version 20H2)
- KB5008212 – 2021-12 cumulative update for Windows 10 Version 20H2
Windows 10 (version 21H1)
- KB5008212 – 2021-12 cumulative update for Windows 10 Version 21H1
Windows 10 (version 21H2)
- KB5008212 – 2021-12 cumulative update for Windows 10 Version 21H2
- KB5008215 – 2021-12 cumulative update for Windows 11
Additional resources
Summary
Article name
Introducing the December 2021 Microsoft Windows security updates
The description
Microsoft released security updates for all supported versions of the Windows operating system and other company products, such as Microsoft Office, on December 14, 2021 Patch Day.
Author
Martin brinkmann
Editor
Ghacks Technology News
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