Microsoft Windows Security Updates September 2020 overview


Welcome to the Microsoft Windows Patch Day overview for September 2020. Microsoft released security updates and non-security updates for all supported client and server operating systems. Other company products have received security updates as well on this Patch Day.

The Windows updates that Microsoft releases on the second Tuesday of a month are cumulative in nature. Administrators may get them via Windows Update, WSUS, as direct downloads, or via other update management systems.

Our monthly overview provides you with details on the released patches. It includes an overview of all security patches that Microsoft released, an Excel spreadsheet with all the patches, an overview of the operating system distribution and severeness, direct download links, links to support pages, security advisories, known issues, and more.

Check out the August 2020 Patch Day in case you missed it.

Microsoft Windows Security Updates September 2020

You may download an Excel spreadsheet with detailed information about the September 2020 Patch Day. Click on the following link to download the archive to your system. All that is left to do is to extract the zip file and open it in a spreadsheet application such as Excel or LibreOffice Calc: windows-security-updates-september-2020

Executive Summary

  • Microsoft released security updates for all supported client and server versions of Windows.
  • Security updates were also released for other company products including Microsoft Edge (old and new), Internet Explorer, Visual Studio, Microsoft Office, Microsoft OneDrive, SQL Server, and Azure DevOps.

Operating System Distribution

  • Windows 7  (extended support only): 33 vulnerabilities: 4 critical and 48 important
    • CVE-2020-0922 | Microsoft COM for Windows Remote Code Execution Vulnerability
    • CVE-2020-1252 | Windows Remote Code Execution Vulnerability
    • CVE-2020-1285 | GDI+ Remote Code Execution Vulnerability
    • CVE-2020-1319 | Microsoft Windows Codecs Library Remote Code Execution Vulnerability
    • CVE-2020-1508 | Windows Media Audio Decoder Remote Code Execution Vulnerability
    • CVE-2020-1593 | Windows Media Audio Decoder Remote Code Execution Vulnerability
  • Windows 8.1: 41 vulnerabilities: 5 rated critical and 51 rated important
    • same as Windows 7
  • Windows 10 version 1803:  63 vulnerabilities: 9 critical and 54 important
    • CVE-2020-0908 | Windows Text Service Module Remote Code Execution Vulnerability
    • CVE-2020-0922 | Microsoft COM for Windows Remote Code Execution Vulnerability
    • CVE-2020-0997 | Windows Camera Codec Pack Remote Code Execution Vulnerability
    • CVE-2020-1129 | Microsoft Windows Codecs Library Remote Code Execution Vulnerability
    • CVE-2020-1252 | Windows Remote Code Execution Vulnerability
    • CVE-2020-1285 | GDI+ Remote Code Execution Vulnerability
    • CVE-2020-1319 | Microsoft Windows Codecs Library Remote Code Execution Vulnerability
    • CVE-2020-1508 | Windows Media Audio Decoder Remote Code Execution Vulnerability
    • CVE-2020-1593 | Windows Media Audio Decoder Remote Code Execution Vulnerability
  • Windows 10 version 1809: 70 vulnerabilities: 9 critical and 56 important
    • same as Windows 10 version 1803
  • Windows 10 version 1903: 70 vulnerabilities: 9 critical and 61 important
    • same as Windows 10 version 1803
  • Windows 10 version 1909: 
    •  same as Windows 10 version 1803
  • Windows 10 version 2004:

Windows Server products

  • Windows Server 2008 R2 (extended support only): 39 vulnerabilities: 6 critical and 33 important
    • CVE-2020-0922 | Microsoft COM for Windows Remote Code Execution Vulnerability
    • CVE-2020-1252 | Windows Remote Code Execution Vulnerability
    • CVE-2020-1285 | GDI+ Remote Code Execution Vulnerability
    • CVE-2020-1319 | Microsoft Windows Codecs Library Remote Code Execution Vulnerability
    • CVE-2020-1508 | Windows Media Audio Decoder Remote Code Execution Vulnerability
    • CVE-2020-1593 | Windows Media Audio Decoder Remote Code Execution Vulnerability
  • Windows Server 2012 R2: 47 vulnerabilities: 6 critical and 41 important.
    • same as Windows Server 2008 R2
  • Windows Server 2016: 62 vulnerabilities: 9 critical and 56 important.
    • same as Windows Server 2008 R2, plus
    • CVE-2020-0908 | Windows Text Service Module Remote Code Execution Vulnerability
    • CVE-2020-1129 | Microsoft Windows Codecs Library Remote Code Execution Vulnerability
    • CVE-2020-0997 | Windows Camera Codec Pack Remote Code Execution Vulnerability
  • Windows Server 2019: 73 vulnerabilities: 9 critical and 64 are important
    • same as Windows Server 2016.

Other Microsoft Products

  • Internet Explorer 11: 3 vulnerability: 1 critical, 2 important
    • CVE-2020-0878 | Microsoft Browser Memory Corruption Vulnerability
  • Microsoft Edge:  4 vulnerabilities: 3 critical, 1 important
    • CVE-2020-0878 | Microsoft Browser Memory Corruption Vulnerability
    • CVE-2020-1057 | Scripting Engine Memory Corruption Vulnerability
    • CVE-2020-1172 | Scripting Engine Memory Corruption Vulnerability
  • Microsoft Edge on Chromium:
    • see here (latest security patches from the Chromium project)

Windows Security Updates

Windows 7 SP1 and Windows Server 2008 R2

Fixes and improvements:

  • Yukon, Canada time zone information update (monthly rollup).
  • Fixes a security vulnerability issue with user proxies and HTTP-based Intranet servers. HTTP-based Intranet servers cannot leverage user proxies to detect updates by default anymore. Check this support page for additional information (monthly rollup).
  • Security Updates

Windows 8.1 and Server 2012 R2

Fixes and improvements:

  • Yukon, Canada time zone information update (monthly rollup).
  • Fixes a security vulnerability issue with user proxies and HTTP-based Intranet servers. HTTP-based Intranet servers cannot leverage user proxies to detect updates by default anymore. Check this support page for additional information (monthly rollup).
  • Fixed an unnamed issue when evaluating the compatibility status of the Windows system (monthly rollup).
  • Security updates.

Windows 10 version 1803

Fixes and improvements:

  • Ability to sync Microsoft Edge IE Mode unidirectional session cookies when configured by an admin.
  • Fixed an issue related to unexpected notifications.
  • Updated Yukon, Canada time zone information.
  • Fixed an Ever Viewer issue that prevented it from saving filtered events correctly.
  • Fixed a delayed shutdown issue caused by Microsoft Keyboard Filter Service.
  • Fixes a security vulnerability issue with user proxies and HTTP-based Intranet servers. HTTP-based Intranet servers cannot leverage user proxies to detect updates by default anymore. Check this support page for additional information (monthly rollup).
  • Security Updates

Windows 10 version 1809

Fixes and improvements:

  • Fixes a security vulnerability issue with user proxies and HTTP-based Intranet servers. HTTP-based Intranet servers cannot leverage user proxies to detect updates by default anymore. Check this support page for additional information (monthly rollup).
  • Security Updates

Windows 10 version 1903 and 1909

Fixes and improvements:

  • Fixes a security vulnerability issue with user proxies and HTTP-based Intranet servers. HTTP-based Intranet servers cannot leverage user proxies to detect updates by default anymore. Check this support page for additional information (monthly rollup).
  • Security Updates

Windows 10 version 2004

Fixes and improvements:

  • Addressed a potential elevation of privilege issue in windowmanagement.dll.
  • Fixes a security vulnerability issue with user proxies and HTTP-based Intranet servers. HTTP-based Intranet servers cannot leverage user proxies to detect updates by default anymore. Check this support page for additional information (monthly rollup).
  • Security Updates

Other security updates

KB4577010 — Cumulative security update for Internet Explorer: September 8, 2020

KB4577038 — 2020-09 Security Monthly Quality Rollup for Windows Embedded 8 Standard and Windows Server 2012

KB4577048 — 2020-09 Security Only Quality Update for Windows Embedded 8 Standard and Windows Server 2012

KB4577064 — 2020-09 Security Monthly Quality Rollup for Windows Server 2008

KB4577070 — 2020-09 Security Only Quality Update for Windows Server 2008

KB4577015 — 2020-09 Cumulative Update for Windows Server 2016 and Windows 10 Version 1607

KB4577021 — 2020-09 Cumulative Update for Windows 10 Version 1703

KB4577041 — 2020-09 Cumulative Update for Windows 10 Version 1709

KB4577049 — 2020-09 Cumulative Update for Windows 10 Version 1507

Microsoft .NET Framework updates:

KB4576485 — 2020-09 Security and Quality Rollup for .NET Framework 4.8 for Windows Embedded 8 Standard and Windows Server 2012

KB4576486 — 2020-09 Security and Quality Rollup for .NET Framework 4.8 for Windows 8.1 and Windows Server 2012 R2

KB4576487 — 2020-09 Security and Quality Rollup for .NET Framework 4.8 for Windows Embedded Standard 7, Windows 7, and Windows Server 2008 R2

KB4576488 — 2020-09 Security Only Update for .NET Framework 4.8 for Windows Embedded 8 Standard and Windows Server 2012

KB4576489 — 2020-09 Security Only Update for .NET Framework 4.8 for Windows 8.1 and Windows Server 2012 R2

KB4576490 — 2020-09 Security Only Update for .NET Framework 4.8 for Windows Embedded Standard 7, Windows 7, and Windows Server 2008 R2

KB4576612 — 2020-09 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 Embedded Standard 7, Windows 7, Windows Server 2008 R2, and Windows Server 2008

KB4576613 — 2020-09 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 Embedded 8 Standard and Windows Server 2012

KB4576614 — 2020-09 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 and Windows Server 2012 R2

KB4576628 — 2020-09 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 Embedded Standard 7, Windows 7, and Windows Server 2008 R2

KB4576629 — 2020-09 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 Embedded 8 Standard and Windows Server 2012

KB4576630 — 2020-09 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 and Windows Server 2012 R2

KB4576631 — 2020-09 Security and Quality Rollup for .NET Framework 2.0, 3.0, 4.5.2, 4.6 for Windows Server 2008

KB4576478 — 2020-09 Cumulative Update for .NET Framework 3.5 and 4.8 for Windows Server, version 2004 and Windows 10 Version 2004

KB4576479 –2020-09 Cumulative Update for .NET Framework 4.8 for Windows Server 2016 and Windows 10 Version 1607

KB4576480 — 2020-09 Cumulative Update for .NET Framework 4.8 for Windows 10 Version 1703

KB4576481 — 2020-09 Cumulative Update for .NET Framework 4.8 for Windows 10 Version 1709

KB4576482 — 2020-09 Cumulative Update for .NET Framework 4.8 for Windows 10 Version 1803 and Windows Server 2016 (1803)

KB4576483 — 2020-09 Cumulative Update for .NET Framework 3.5 and 4.8 for Windows Server 2019 and Windows 10 Version 1809

KB4576484 — 2020-09 Cumulative Update for .NET Framework 3.5 and 4.8 for Windows Server, version 1909, Windows 10 Version 1909, Windows Server 2019 (1903), and Windows 10 Version 1903

KB4576627 — 2020-09 Cumulative Update for .NET Framework 3.5 and 4.7.2 for Windows Server 2019 and Windows 10 Version 1809

Servicing Stack updates:

KB4577266 — 2020-09 Servicing Stack Update for Windows Server, version 2004 and Windows 10 Version 2004

KB4570332 — 2020-09 Servicing Stack Update for Windows Server 2019 and Windows 10 Version 1809

KB4576750 — 2020-09 Servicing Stack Update for Windows Server 2016 and Windows 10 Version 1607

KB4576751 — 2020-09 Servicing Stack Update for Windows Server 2019 (1903), and Windows 10 Version 1903

Known Issues

Windows 7 SP1 and Windows Server 2008 R2

  • Updates may fail to install if the system is not supported by ESU.
  • Certain operations may fail on cluster shared volumes. See workarounds on the support page.

Windows 8.1 and Server 2012 R2

  • Certain operations may fail on cluster shared volumes. See workarounds on the support page.

Windows 10 version 1809

  • Error “0x800f0982 – PSFX_E_MATCHING_COMPONENT_NOT_FOUND.”  on systems with certain Asian language packs. Microsoft suggests to uninstall and reinstall the language packs, or to reset the PC.
  • Microsoft Edge legacy error “0x80704006. Hmmmm…can’t reach this page” when trying to access sites on non-standard ports. Suggestions include using the new Edge or IE 11.

Windows 10 version 2004

  • Users of the Microsoft Input Method Editor for Chinese and Japanese may experience various issues. Check this support page for additional details.

Security advisories and updates

Non-security related updates

KB4566371 — 2020-09 Update for Windows 8.1, Windows Server 2012 R2, Windows Embedded 8 Standard, Windows Server 2012, Windows 7, Windows Server 2008 R2, and Windows Server 2008

KB4574726 — 2020-09 Dynamic Update for Dynamic Update for Windows 10 Version 1903, and Windows 10 Version 1909

KB4578847 — 2020-09 Update for Windows Server 2008 R2 for x64-based Systems

KB890830 — Windows Malicious Software Removal Tool

KB4574728 — 2020-09 Dynamic Update for Windows 10 Version 2004

Microsoft Office Updates

You find Office update information here.

How to download and install the September 2020 security updates

windows security updates september 2020

Security updates are released via Microsoft’s Windows Update service and update management services such as WSUS. The main cumulative updates may also be downloaded from the company’s Microsoft Update Catalog website.

It is recommended to back up the system before updates are installed as the installation of updates may cause numerous issues including boot issues, data loss or loss of functionality.

Windows administrators may run a manual update check at any time on home devices. Here are the instructions on how to do that:

  1. Select Start and select Settings.
  2. Select Update & Security in the Settings application.
  3. Click on the “check for updates” button to run a manual check for updates. Windows checks if important updates are available to download and install these on the device.

Direct update downloads

Below are resource pages with direct download links, if you prefer to download the updates to install them manually.

Windows 7 and Server 2008 R2

  • KB4577051 — 2020-09 Security Monthly Quality Rollup for Windows 7
  • KB4577053 — 2020-09 Security Only Quality Update for Windows 7

Windows 8.1 and Windows Server 2012 R2

  • KB4577066 — 2020-09 Security Monthly Quality Rollup for Windows 8.1
  • KB4577071 — 2020-09 Security Only Quality Update for Windows 8.1

Windows 10 (version 1803)

  • KB4577032 — 2020-09 Cumulative Update for Windows 10 Version 1803

Windows 10 (version 1809)

  • KB4570333 — 2020-09 Cumulative Update for Windows 10 Version 1809

Windows 10 (version 1903)

  • KB4574727 — 2020-09 Cumulative Update for Windows 10 Version 1903

Windows 10 (version 1909)

  • KB4574727  — 2020-09 Cumulative Update for Windows 10 Version 1909

Windows 10 (version 2004)

  • KB4571756 — 2020-09 Cumulative Update for Windows 10 Version 2004

Additional resources

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