Microsoft has published the February 2021 security updates.

Updates this Month

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

• .NET Core
• .NET Framework
• Azure IoT
• Developer Tools
• Microsoft Azure Kubernetes Service
• Microsoft Dynamics
• Microsoft Edge for Android
• Microsoft Exchange Server
• Microsoft Graphics Component
• Microsoft Office Excel
• Microsoft Office SharePoint
• Microsoft Windows Codecs Library
• Role: DNS Server
• Role: Hyper-V
• Role: Windows Fax Service
• Skype for Business
• SysInternals
• System Center
• Visual Studio
• Windows Address Book
• Windows Backup Engine
• Windows Console Driver
• Windows Defender
• Windows DirectX
• Windows Event Tracing
• Windows Installer
• Windows Kernel
• Windows Mobile Device Management
• Windows Network File System
• Windows PFX Encryption
• Windows PKU2U
• Windows PowerShell
• Windows Print Spooler Components
• Windows Remote Procedure Call
• Windows TCP/IP
• Windows Trust Verification API

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-2021-1722
• CVE-2021-1726
• CVE-2021-1728
• CVE-2021-1730
• CVE-2021-1731
• CVE-2021-1733
• CVE-2021-1734
• CVE-2021-24066
• CVE-2021-24067
• CVE-2021-24068
• CVE-2021-24069
• CVE-2021-24070
• CVE-2021-24071
• CVE-2021-24074
• CVE-2021-24076
• CVE-2021-24077
• CVE-2021-24078
• CVE-2021-24079
• CVE-2021-24084
• CVE-2021-24085
• CVE-2021-24086
• CVE-2021-24087
• CVE-2021-24092
• CVE-2021-24093
• CVE-2021-24094
• CVE-2021-24098
• CVE-2021-24100
• CVE-2021-24101
• CVE-2021-24105
• CVE-2021-24106
• CVE-2021-24109
• CVE-2021-24112
• CVE-2021-24114
• CVE-2021-25195
• CVE-2021-26700
• CVE-2021-26701

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
4493194	SharePoint Server 2019
4493195	SharePoint Enterprise Server 2016
4493210	SharePoint Foundation 2013
4493223	SharePoint Foundation 2010
4571787	Exchange Server 2019
4600944	Security and Quality Rollup for .NET Framework 4.8 for Windows 7 SP1 and Windows Server 2008 R2 SP1
4600945	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 7 SP1 and Windows Server 2008 R2 SP1 and Windows Server 2008 SP2
4600957	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 Server 2012
4601048	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, RT 8.1, and Windows Server 2012 R2
4601050	Cumulative Update for .NET Framework 3.5 and 4.8 for Windows 10, version 2004, Windows Server, version 2004, Windows 10, version 20H2, and Windows Server, version 20H2
4601051	Cumulative Update for .NET Framework 4.8 for Windows 10, version 1607 and Windows Server, version 2016
4601052	Cumulative Update for .NET Framework 4.8 for Windows 10 Version 1703
4601054	Cumulative Update for .NET Framework 4.8 for Windows 10 Version 1803
4601055	Cumulative Update for .NET Framework 3.5 and 4.8 for Windows 10, version 1809 and Windows Server, version 2019
4601056	Cumulative Update for .NET Framework 3.5 and 4.8 for Windows 10, version 1909, and Windows Server, version 1909
4601057	Security and Quality Rollup for .NET Framework 4.8 for Windows Server 2012
4601058	Security and Quality Rollup for .NET Framework 4.8 for Windows 8.1, RT 8.1, and Windows Server 2012 R2
4601060	Cumulative Update for .NET Framework 3.5 and 4.7.2 for Windows 10, version 1809 and Windows Server, version 2019
4601315	Windows 10, Version 1909, Windows Server, Version 1909
4601318	Windows 10, Version 1607, Windows Server 2016
4601319	Windows 10, version 2004
4601345	Windows 10, Version 1809, Windows Server 2019
4601347	Windows 7, Windows Server 2008 R2 (Monthly Rollup)
4601348	Windows Server 2012 (Monthly Rollup)
4601349	Windows 8.1, Windows RT 8.1, Windows Server 2012 R2 (Security-only update)
4601357	Windows Server 2012 (Security-only update)
4601360	Windows Server 2008 (Monthly Rollup)
4601363	Windows 7, Windows Server 2008 R2 (Security-only update)
4601366	Windows Server 2008 (Security-only update)
4601384	Windows 8.1, Windows RT 8.1, Windows Server 2012 R2 (Monthly Rollup)
4601887	Cumulative Update for .NET Framework 3.5, 4.7.2 and 4.8 for Windows 10, version 1809 and Windows Server, version 2019
4602269	Exchange Server 2019, Exchange Server 2016
4603002	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 7 SP1 and Windows Server 2008 R2 SP1
4603003	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 Server 2012
4603004	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, RT 8.1, and Windows Server 2012 R2
4603005	Security and Quality Rollup for .NET Framework 2.0, 3.0, 4.5.2, 4.6 for Windows Server 2008 SP2

Security Update Guide - Microsoft Security Response Center