Microsoft has published the October 2020 security updates. 

The October security release consists of security updates for the following software:

• Microsoft Windows
• Microsoft Office and Microsoft Office Services and Web Apps
• Microsoft JET Database Engine
• Azure Functions
• Open Source Software
• Microsoft Exchange Server
• Visual Studio
• PowerShellGet
• Microsoft .NET Framework
• Microsoft Dynamics
• Adobe Flash Player
• Microsoft Windows Codecs Library

Please note the following information regarding the security updates:

• Microsoft is improving Windows Release Notes. For more information, please see  What's next for Windows release notes.
• For information regarding enabling Windows 10, version 1909 features, please see Windows 10, version 1909 delivery options. Note that Windows 10, versions 1903 and 1909 share a common core operating system with an identical set of system files. They will also share the same security update KBs.
• 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.
• 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.
• Updates for Windows RT 8.1 and Microsoft Office RT software are only available via  Windows 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.

The following CVEs have FAQs with additional information and may include * further steps to take after installing the updates. Please note that this is not a complete list of CVEs for this release.

• ADV200012 *
• CVE-2020-16889
• CVE-2020-16896 *
• CVE-2020-16897
• CVE-2020-16901
• CVE-2020-16904
• CVE-2020-16914
• CVE-2020-16918
• CVE-2020-16919
• CVE-2020-16921
• CVE-2020-16928
• CVE-2020-16929
• CVE-2020-16930
• CVE-2020-16931
• CVE-2020-16932
• CVE-2020-16933 *
• CVE-2020-16934
• CVE-2020-16937
• CVE-2020-16938
• CVE-2020-16941
• CVE-2020-16942
• CVE-2020-16947 *
• CVE-2020-16949 *
• CVE-2020-16954
• CVE-2020-16955
• CVE-2020-16957
• CVE-2020-16969
• CVE-2020-16970
• CVE-2020-16981
• CVE-2020-16982
• CVE-2020-16983
• CVE-2020-16984
• CVE-2020-16985
• CVE-2020-16986
• CVE-2020-16987
• CVE-2020-16988
• CVE-2020-16989
• CVE-2020-16990
• CVE-2020-16991
• CVE-2020-16992
• CVE-2020-16993
• CVE-2020-16994
• CVE-2020-16995

Known Issues

The following KBs contain information about known issues with the security updates. For a complete list of security update KBs, please see  20201013. 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 ArticleApplies To

4577668	Windows 10 Version 1809, Windows Server 2019
4577671	Windows 10, version 1903, Windows Server version 1903, Windows 10, version 1909, Windows Server version 1909
4579311	Windows 10, version 2004
4580327	Windows 10
4580328	Windows 10, version 1709
4580330	Windows 10, version 1803
4580345	Windows 7, Windows Server 2008 R2 (Monthly Rollup)
4580346	Windows 10, version 1607, Windows Server 2016
4580347	Windows 8.1, Windows Server 2012 R2 (Monthly Rollup)
4580353	Windows Server 2012 (Security-only update)
4580358	Windows 8.1, Windows Server 2012 R2 (Security-only update)
4580378	Windows Server 2008 Service Pack 2 (Monthly Rollup)
4580382	Windows Server 2012 (Monthly Rollup)
4580385	Windows Server 2008 Service Pack 2 (Security-only update)
4580387	Windows 7, Windows Server 2008 R2 (Security-only update)
4581424	Exchange Server 2019, Exchange Server 2016, Exchange Server 2013

October 2020 Security Updates