Microsoft February 2021 Security Updates

The Microsoft February 2021 security updates have been released and consist of 56 CVEs.  Of these 56 CVEs, 11 are rated Critical, 43 are rated Important, and two are rated Moderate in severity.  One bug (CVE-2021-1732) is known to be actively exploited and six other bugs are listed as being publicly known at the time of release. 

The updates apply to the following products:  Microsoft Windows components, .NET Framework, Azure IoT, Azure Kubernetes Service, Microsoft Edge for Android, Exchange Server, Office and Office Services and Web Apps, Skype for Business and Lync, and Windows Defender.

If you are using Windows Update, the latest SSU will be offered to you automatically. To get the standalone package for the latest SSU, search for it in the Microsoft Update Catalog.  For information about Servicing Stack updates see Servicing Stack Updates (SSU).

The KBs listed below contain information about known issues with the security updates.  

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

 Recommended Reading:   

See Dustin Childs review and analysis in Zero Day Initiative -- The February 2021 Security Update Review.

For more information about the updates released today, see the Security Update Guide.

REMINDER:  Adobe Flash Player is out of support.  For more information, see Adobe Flash end of support on December 31, 2020. Flash content is blocked from running in Flash Player today, January 12, 2021. For more information, see Adobe Flash Player EOL General Information Page.

Additional Update Notes:

• MSRT -- The Malicious Software Removal Tool is now run on a quarterly basis rather than monthly.  See Remove specific prevalent malware with Windows Malicious Software Removal Tool.
• Servicing Stack Updates -- 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. Learn more about SSU's in Servicing Stack Updates (SSU)
• 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 also available via the Microsoft Update Catalog.
• For information on lifecycle and support dates for Windows 10 operating systems, please see Windows Lifecycle Facts Sheet.
• Windows Update History:
  • Windows 10
  • Windows 8.1

References

• Security Update FAQ
• February Security Updates Guide

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