Microsoft October 2021 Security Updates

October 2021 Security Updates

Updates this Month


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

• .NET Core & Visual Studio
• Active Directory Federation Services
• Console Window Host
• HTTP.sys
• Microsoft DWM Core Library
• Microsoft Dynamics
• Microsoft Dynamics 365 Sales
• Microsoft Edge (Chromium-based)
• Microsoft Exchange Server
• Microsoft Graphics Component
• Microsoft Intune
• Microsoft Office Excel
• Microsoft Office SharePoint
• Microsoft Office Visio
• Microsoft Office Word
• Microsoft Windows Codecs Library
• Rich Text Edit Control
• Role: DNS Server
• Role: Windows Active Directory Server
• Role: Windows AD FS Server
• Role: Windows Hyper-V
• System Center
• Visual Studio
• Windows AppContainer
• Windows AppX Deployment Service
• Windows Bind Filter Driver
• Windows Cloud Files Mini Filter Driver
• Windows Common Log File System Driver
• Windows Desktop Bridge
• Windows DirectX
• Windows Event Tracing
• Windows exFAT File System
• Windows Fastfat Driver
• Windows Installer
• Windows Kernel
• Windows MSHTML Platform
• Windows Nearby Sharing
• Windows Network Address Translation (NAT)
• Windows Print Spooler Components
• Windows Remote Procedure Call Runtime
• Windows Storage Spaces Controller
• Windows TCP/IP
• Windows Text Shaping
• Windows Win32K

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

• IMPORTANT ANNOUNCEMENT: In the coming months we will be moving to a new, more user-friendly and flexible system for delivering Microsoft Technical Security Notifications. Upcoming information about how you can sign up for and receive these Technical Security Notifications will be coming soon.
• 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-2020-1971
• CVE-2021-26427
• CVE-2021-26441
• CVE-2021-3449
• CVE-2021-3450
• CVE-2021-37974
• CVE-2021-37975
• CVE-2021-37976
• CVE-2021-38662
• CVE-2021-38663
• CVE-2021-38672
• CVE-2021-40454
• CVE-2021-40456
• CVE-2021-40457
• CVE-2021-40460
• CVE-2021-40468
• CVE-2021-40469
• CVE-2021-40471
• CVE-2021-40472
• CVE-2021-40473
• CVE-2021-40474
• CVE-2021-40475
• CVE-2021-40479
• CVE-2021-40480
• CVE-2021-40481
• CVE-2021-40482
• CVE-2021-40485
• CVE-2021-40486
• CVE-2021-40487
• CVE-2021-40489
• CVE-2021-41332
• CVE-2021-41336
• CVE-2021-41337
• CVE-2021-41342
• CVE-2021-41343
• CVE-2021-41352
• CVE-2021-41355
• CVE-2021-41361
• CVE-2021-41363

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
5006670 Windows 10, Version 20H2
5006672 Windows 10, Version 1809, Windows Server 2019
5006714 Windows 8.1, Windows RT 8.1, Windows Server 2012 R2 (Monthly Rollup)
5006715 Windows Server 2008 SP2 (Security-only update)
5006728 Windows 7, Windows Server 2008 R2 (Security-only update)
5006729 Windows 8.1, Windows RT 8.1, Windows Server 2012 R2 (Security-only update)
5006732 Windows Server 2012 (Security-only update)
5006736 Windows Server 2008 SP2 (Monthly Rollup)
5006739 Windows Server 2012 (Monthly Rollup)
5006743 Windows 7, Windows Server 2008 R2 (Monthly Rollup)
5007011 Exchange Server 2013
5007012 Exchange Server 2016, Exchange Server 2019

Released: Oct 12, 2021
October 2021 Security Updates - Release Notes - Security Update Guide - Microsoft