Microsoft has announced the security updates for December 2021.

December 2021 Security Updates

Updates this Month

This release consists of security updates for the following products, features and roles.

• Apps
• ASP.NET Core & Visual Studio
• Azure Bot Framework SDK
• BizTalk ESB Toolkit
• Internet Storage Name Service
• Microsoft Defender for IoT
• Microsoft Devices
• Microsoft Edge (Chromium-based)
• Microsoft Local Security Authority Server (lsasrv)
• Microsoft Message Queuing
• Microsoft Office
• Microsoft Office Access
• Microsoft Office Excel
• Microsoft Office SharePoint
• Microsoft PowerShell
• Microsoft Windows Codecs Library
• Office Developer Platform
• Remote Desktop Client
• Role: Windows Fax Service
• Role: Windows Hyper-V
• Visual Studio Code
• Visual Studio Code - WSL Extension
• Windows Common Log File System Driver
• Windows Digital TV Tuner
• Windows DirectX
• Windows Encrypting File System (EFS)
• Windows Event Tracing
• Windows Installer
• Windows Kernel
• Windows Media
• Windows Mobile Device Management
• Windows NTFS
• Windows Print Spooler Components
• Windows Remote Access Connection Manager
• Windows Storage
• Windows Storage Spaces Controller
• Windows SymCrypt
• Windows TCP/IP
• Windows Update Stack

Please note the following information regarding the security updates:

Security Update Guide Blog Posts

Date	Blog Post
February 9, 2021	Continuing to Listen: Good News about the Security Update Guide API
January 13, 2021	Security Update Guide Supports CVEs Assigned by Industry Partners
December 8, 2020	Security Update Guide: Let’s keep the conversation going
November 9, 2020	Vulnerability Descriptions in the New Version of the Security Update Guide

Relevant Information

• Windows 10 updates are cumulative. The monthly security release includes all security fixes for vulnerabilities that affect Windows 10, in addition to non-security updates. The updates are available via the  Microsoft Update Catalog. For information on lifecycle and support dates for Windows 10 operating systems, please see  Windows Lifecycle Facts Sheet.
• Microsoft is improving Windows Release Notes. For more information, please see  What's next for Windows release notes.
• A list of the latest servicing stack updates for each operating system can be found in  ADV990001. This list will be updated whenever a new servicing stack update is released. It is important to install the latest servicing stack update.
• In addition to security changes for the vulnerabilities, updates include defense-in-depth updates to help improve security-related features.
• Customers running Windows 7, Windows Server 2008 R2, or Windows Server 2008 need to purchase the Extended Security Update to continue receiving security updates. See  4522133 for more information.

FAQs, Mitigations, and Workarounds

The following CVEs have FAQs, Mitigations, or Workarounds. You can see these in more detail from the Vulnerabilities tab by selecting FAQs, Mitigations and Workarounds columns in the Edit Columns panel.

• CVE-2021-40452
• CVE-2021-40453
• CVE-2021-4052
• CVE-2021-4053
• CVE-2021-4054
• CVE-2021-4055
• CVE-2021-4056
• CVE-2021-4057
• CVE-2021-4058
• CVE-2021-4059
• CVE-2021-4061
• CVE-2021-4062
• CVE-2021-4063
• CVE-2021-4064
• CVE-2021-4065
• CVE-2021-4066
• CVE-2021-4067
• CVE-2021-4068
• CVE-2021-41360
• CVE-2021-41365
• CVE-2021-42293
• CVE-2021-42294
• CVE-2021-42295
• CVE-2021-42309
• CVE-2021-42310
• CVE-2021-42311
• CVE-2021-42312
• CVE-2021-42313
• CVE-2021-42314
• CVE-2021-42315
• CVE-2021-43216
• CVE-2021-43217
• CVE-2021-42320
• CVE-2021-43214
• CVE-2021-43215
• CVE-2021-43217
• CVE-2021-43222
• CVE-2021-43224
• CVE-2021-43227
• CVE-2021-43235
• CVE-2021-43236
• CVE-2021-43243
• CVE-2021-43244
• CVE-2021-43255
• CVE-2021-43256
• CVE-2021-43875
• CVE-2021-43880
• CVE-2021-43882
• CVE-2021-43888
• CVE-2021-43889
• CVE-2021-43890
• CVE-2021-43899
• CVE-2021-43905

Known Issues

You can see these in more detail from the Deployments tab by selecting Known Issues column in the Edit Columns panel.

For more information about Windows Known Issues, please see  Windows message center (links to currently-supported versions of Windows are in the left pane).

KB Article	Applies To
5008207	Windows 10, Version 1607, Windows Server 2016
5008212	Windows 10, Version 2004, Windows Server, Version 2004, Windows 10, Version 20H2, Windows Server, Version 20H2, Windows 10, Version 21H1
5008218	Windows 10, Version 1809, Windows Server 2019
5008223	Windows Server 2022
5008244	Windows 7, Windows Server 2008 R2 (Monthly Rollup)
5008255	Windows Server 2012 (Security-only update)
5008263	Windows 8.1, Windows Server 2012 R2 (Monthly Rollup)
5008271	Windows Server 2008 (Security-only update)
5008274	Windows Server 2008 (Monthly Rollup)
5008277	Windows Server 2012 (Monthly Rollup)
5008282	Windows 7, Windows Server 2008 R2 (Security-only update)
5008285	Windows 8.1, Windows Server 2012 R2 (Security-only update)

Security Update Guide - Microsoft Security Response Center