It is the second Tuesday of October 2020 and that means that it is Microsoft Patch Day. Microsoft released security updates for all supported versions of the company’s Windows operating system as well as other company products such as Microsoft Edge and Microsoft Office.
Our overview of the October 2020 provides you with information on the released patches and links to Microsoft support pages and downloads. All Windows updates are cumulative in nature, and available as direct downloads, via Windows Updates, WSUS, and other update management systems.
The overview begins with an executive summary. The analysis that follows includes information about the distribution of vulnerabilities across different versions of Windows (client and server), as well as Microsoft’s browsers, details on each of the updates, links to support pages, information about other updates and security advisories, direct download links and instructions, and a resource link list at the end.
You can check out the September 2020 Microsoft Patch Day overview here.
Microsoft Windows Security Updates October 2020
Download the following Excel spreadsheet if you are interested in a detailed spreadsheet listing the released security updates of October 2020. Just extract the zip archive after download and load it in a spreadsheet application such as Excel or LibreOffice Calc. Click here to download it: microsoft-windows-security-updates-october-2020
Executive Summary
- Security updates are available for all supported versions of Microsoft’s Windows operating system (client and server).
- Microsoft released security updates for the following products besides Windows: Microsoft Office, Microsoft JET Database Engine, Visual Studio, Microsoft Exchange Server, Azure Functions and Sphere, PowerShellGet, Microsoft .Net Framework, Microsoft Dynamics, Adobe Flash Player, Microsoft Windows Codecs Library
- Windows 10 version 1809 reaches end of support next month, Windows 10 version 1903 in December 2020.
Operating System Distribution
- Windows 7 (extended support only): 23 vulnerabilities: 2 critical and 21 important
- CVE-2020-16923 | Microsoft Graphics Components Remote Code Execution Vulnerability
- CVE-2020-16891 | Windows Hyper-V Remote Code Execution Vulnerability
- Windows 8.1: 19 vulnerabilities: 3 rated critical and 16 rated important
- Windows 10 version 1803: 48 vulnerabilities: 7 critical and 41 important
- CVE-2020-16967 | Windows Camera Codec Pack Remote Code Execution Vulnerability
- CVE-2020-16923 | Microsoft Graphics Components Remote Code Execution Vulnerability
- CVE-2020-16915 | Media Foundation Memory Corruption Vulnerability
- CVE-2020-16968 | Windows Camera Codec Pack Remote Code Execution Vulnerability
- CVE-2020-16911 | GDI+ Remote Code Execution Vulnerability
- CVE-2020-16898 | Windows TCP/IP Remote Code Execution Vulnerability
- CVE-2020-16891 | Windows Hyper-V Remote Code Execution Vulnerability
- Windows 10 version 1809: 48 vulnerabilities: 7 critical and 41 important
- same as Windows 10 version 1803
- Windows 10 version 1903 and 1909: 49 vulnerabilities: 7 critical and 42 important
- same as Windows 10 version 1803
- Windows 10 version 2004:
- no information provided by Microsoft
Windows Server products
- Windows Server 2008 R2 (extended support only): 23 vulnerabilities: 2 critical and 21 important
- CVE-2020-16923 | Microsoft Graphics Components Remote Code Execution Vulnerability
- CVE-2020-16891 | Windows Hyper-V Remote Code Execution Vulnerability
- Windows Server 2012 R2: 20 vulnerabilities: 3 critical and 17 important.
- Windows Server 2016: 38 vulnerabilities: 4 critical and 34 important.
- Windows Server 2019: 46 vulnerabilities: 5 critical and 41 are important
- same as Windows Server 2016, plus
- CVE-2020-16898 | Windows TCP/IP Remote Code Execution Vulnerability
Other Microsoft Products
Windows Security Updates
Windows 7 SP1 and Windows Server 2008 R2
Fixes and improvements
- Security updates
- Fixed an issue in Graphics Device Interface (GDI) that could cause unexpected user interface experiences such as missing screen elements, screen flickering, or a trailing screen.
- Fixed daylight savings time for Fiji Islands.
- Fixed a Group Policy issue that could cause it to delete critical files if the policy “Delete local user profile” was enabled. (monthly-rollup only)
- Fixed an issue that created a Null port.
Windows 8.1 and Server 2012 R2
Fixes and improvements
- Security updates
- Fixed daylight savings time for Fiji Islands.
- Fixed a Group Policy issue that could cause it to delete critical files if the policy “Delete local user profile” was enabled. (monthly-rollup only)
- Fixed an issue that created a Null port. (monthly-rollup only)
- Internet Explorer 11 will show a notification that Flash support ends in December 2020.(monthly-rollup only)
- Administrators may disable JScript in security zones.(monthly-rollup only)
- Fixed an unnamed issue in Microsoft Edge’s IE Mode that occurred when Configure enhanced hang detection for Internet Explorer mode was enabled.(monthly-rollup only)
Windows 10 version 1803
Fixes and improvements
- Security updates
- Fixed daylight savings time for Fiji Islands.
- Administrators may disable JScript in security zones.
- Internet Explorer 11 will show a notification that Flash support ends in December 2020.
- Fixed an unnamed issue in Microsoft Edge’s IE Mode that occurred when Configure enhanced hang detection for Internet Explorer mode was enabled.
- Fixed an issue that created a Null port.
- Fixed an issue with a possible elevation of privilege in win32k.
- Fixed a Group Policy issue that could cause it to delete critical files if the policy “Delete local user profile” was enabled.
Windows 10 version 1809
Fixes and improvements
- Security updates
- Fixed an issue with a possible elevation of privilege in win32k.
- Fixed a Group Policy issue that could cause it to delete critical files if the policy “Delete local user profile” was enabled.
- Fixed an issue that created a Null port.
- Fixed an issue that caused apps that use Dynamic Data Exchange (DDE) to stop responding when closing the app.
Windows 10 version 1903 and 1909
Fixes and improvements
- Security updates
- Fixed an issue with a possible elevation of privilege in win32k.
- Fixed a Group Policy issue that could cause it to delete critical files if the policy “Delete local user profile” was enabled.
- Fixed an issue that created a Null port.
Windows 10 version 2004
Fixes and improvements
- Security updates
- Fixed an issue with a possible elevation of privilege in win32k.
- Fixed a Group Policy issue that could cause it to delete critical files if the policy “Delete local user profile” was enabled.
- Fixed an issue that created a Null port.
Other security updates
KB4580325 — 2020-10 Security Update for Adobe Flash Player for Windows Server, version 2004, Windows 10 Version 2004, Windows Server, version 1909, Windows 10 Version 1909, Windows Server 2019 (1903), Windows 10 Version 1903, Windows 10 Version 1809, Windows 10 Version 1803, Windows Server 2016, Windows 10 Version 1709, Windows 10 Version 1703, Windows 10 Version 1607, Windows 8.1, Windows RT 8.1, Windows Server 2012 R2, Windows Embedded 8 Standard, and Windows Server 2012
KB4580353 — 2020-10 Security Only Quality Update for Windows Embedded 8 Standard and Windows Server 2012
KB4580358 — 2020-10 Security Only Quality Update for Windows 8.1 and Windows Server 2012 R2
KB4580378 — 2020-10 Security Monthly Quality Rollup for Windows Server 2008
KB4580385 — 2020-10 Security Only Quality Update for Windows Server 200
KB4580382 — 2020-10 Security Monthly Quality Rollup for Windows Embedded 8 Standard and Windows Server 2012
KB4580327 — 2020-10 Cumulative Update for Windows 10 Version 1507
KB4580370 — 2020-10 Cumulative Update for Windows 10 Version 1703
KB4580328 — 2020-10 Cumulative Update for Windows 10 Version 1709
KB4580346 — 2020-10 Cumulative Update for Windows 10 Version 1607, and Windows Server 2016
.Net Framework
KB4565577 — 2020-10 Security Only Update for .NET Framework 3.5 for Windows Embedded 8 Standard and Windows Server 2012
KB4565578 — 2020-10 Security Only Update for .NET Framework 2.0, 3.0 for Windows Server 2008
KB4565579 — 2020-10 Security Only Update for .NET Framework 3.5.1 for Windows Embedded Standard 7, Windows 7, and Windows Server 2008 R2
KB4565580 — 2020-10 Security Only Update for .NET Framework 3.5 for Windows 8.1 and Windows Server 2012 R2
KB4565581 — 2020-10 Security Only Update for .NET Framework 4.5.2 for Windows 8.1 and Windows Server 2012 R2
KB4565582 — 2020-10 Security Only Update for .NET Framework 4.5.2 for Windows Embedded 8 Standard and Windows Server 2012
KB4565583 — 2020-10 Security Only Update for .NET Framework 4.5.2 for Windows Embedded Standard 7, Windows 7, Windows Server 2008 R2, and Windows Server 2008
KB4565584 — 2020-10 Security Only Update 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
KB4565585 — 2020-10 Security Only Update 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
KB4565586 — 2020-10 Security Only Update 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
KB4565587 — 2020-10 Security Only Update for .NET Framework 4.8 for Windows Embedded 8 Standard and Windows Server 2012
KB4565588 — 2020-10 Security Only Update for .NET Framework 4.8 for Windows 8.1 and Windows Server 2012 R2
KB4565589 — 2020-10 Security Only Update for .NET Framework 4.8 for Windows Embedded Standard 7, Windows 7, and Windows Server 2008 R2
KB4566466 — 2020-10 Security Only Update 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
KB4566467 — 2020-10 Security Only Update 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
KB4566468 — 2020-10 Security Only Update 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
KB4566469 — 2020-10 Security Only Update for .NET Framework 2.0, 3.0, 4.5.2, 4.6 for Windows Server 2008
KB4578950 — 2020-10 Security and Quality Rollup for .NET Framework 3.5 for Windows Embedded 8 Standard and Windows Server 2012
KB4578951 — 2020-10 Security and Quality Rollup for .NET Framework 2.0, 3.0 for Windows Server 2008
KB4578952 — 2020-10 Security and Quality Rollup for .NET Framework 3.5.1 for Windows Embedded Standard 7, Windows 7, and Windows Server 2008 R2
KB4578953 — 2020-10 Security and Quality Rollup for .NET Framework 3.5 for Windows 8.1 and Windows Server 2012 R2
KB4578954 — 2020-10 Security and Quality Rollup for .NET Framework 4.5.2 for Windows Embedded 8 Standard and Windows Server 2012
KB4578955 — 2020-10 Security and Quality Rollup for .NET Framework 4.5.2 for Windows Embedded Standard 7, Windows 7, Windows Server 2008 R2, and Windows Server 2008
KB4578956 — 2020-10 Security and Quality Rollup for .NET Framework 4.5.2 for Windows 8.1 and Windows Server 2012 R2
KB4578961 — 2020-10 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
KB4578962 — 2020-10 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
KB4578963 — 2020-10 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
KB4578975 — 2020-10 Security and Quality Rollup for .NET Framework 4.8 for Windows Embedded 8 Standard and Windows Server 2012
KB4578976 — 2020-10 Security and Quality Rollup for .NET Framework 4.8 for Windows 8.1 and Windows Server 2012 R2
KB4578977 — 2020-10 Security and Quality Rollup for .NET Framework 4.8 for Windows Embedded Standard 7, Windows 7, and Windows Server 2008 R2
KB4578978 — 2020-10 Security Only Update for .NET Framework 3.5 for Windows Embedded 8 Standard and Windows Server 2012
KB4578979 — 2020-10 Security Only Update for .NET Framework 2.0, 3.0 for Windows Server 2008
KB4578980 — 2020-10 Security Only Update for .NET Framework 3.5.1 for Windows Embedded Standard 7, Windows 7, and Windows Server 2008 R2
KB4578981 — 2020-10 Security Only Update for .NET Framework 3.5 for Windows 8.1 and Windows Server 2012 R2
KB4578982 — 2020-10 Security Only Update for .NET Framework 4.5.2 for Windows Embedded 8 Standard and Windows Server 2012
KB4578983 — 2020-10 Security Only Update for .NET Framework 4.5.2 for Windows Embedded Standard 7, Windows 7, Windows Server 2008 R2, and Windows Server 2008
KB4578984 — 2020-10 Security Only Update for .NET Framework 4.5.2 for Windows 8.1 and Windows Server 2012 R2
KB4578985 — 2020-10 Security Only Update 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
KB4578986 — 2020-10 Security Only Update 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
KB4578987 — 2020-10 Security Only Update 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
KB4578988 — 2020-10 Security Only Update for .NET Framework 4.8 for Windows Embedded 8 Standard and Windows Server 2012
KB4578989 — 2020-10 Security Only Update for .NET Framework 4.8 for Windows 8.1 and Windows Server 2012 R2
KB4578990 — 2020-10 Security Only Update for .NET Framework 4.8 for Windows Embedded Standard 7, Windows 7, and Windows Server 2008 R2
KB4579977 — 2020-10 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
KB4579978 — 2020-10 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
KB4579979 — 2020-10 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
KB4579980 — 2020-10 Security and Quality Rollup for .NET Framework 2.0, 3.0, 4.5.2, 4.6 for Windows Server 2008
KB4580467 — 2020-10 Security Only Update 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
KB4580468 — 2020-10 Security Only Update 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
KB4580469 — 2020-10 Security Only Update 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
KB4580470 — 2020-10 Security Only Update for .NET Framework 2.0, 3.0, 4.5.2, 4.6 for Windows Server 2008
KB4578966 — 2020-10 Cumulative Update for .NET Framework 3.5 and 4.7.2 for Windows Server 2019 and Windows 10 Version 1809
KB4578968 — 2020-10 Cumulative Update for .NET Framework 3.5 and 4.8 for Windows Server, version 2004, and Windows 10 Version 2004
KB4578969 — 2020-10 Cumulative Update for .NET Framework 4.8 for Windows Server 2016 and Windows 10 Version 1607
KB4578970 — 2020-10 Cumulative Update for .NET Framework 4.8 for Windows 10 Version 1703
KB4578971 — 2020-10 Cumulative Update for .NET Framework 4.8 for Windows 10 Version 1709
KB4578972 — 2020-10 Cumulative Update for .NET Framework 4.8 for Windows 10 Version 1803 and Windows Server 2016 (1803)
KB4578973 — 2020-10 Cumulative Update for .NET Framework 3.5 and 4.8 for Windows Server 2019 and Windows 10 Version 1809
KB4578974 — 2020-10 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
KB4579976 — 2020-10 Cumulative Update for .NET Framework 3.5 and 4.7.2 for Windows Server 2019 and Windows 10 Version 1809
Servicing Stack Updates
KB4580970 — 2020-10 Servicing Stack Update for Windows Embedded Standard 7, Windows 7, and Windows Server 2008 R2
KB4580398 — 2020-10 Servicing Stack Update for Windows 10 Version 1803
KB4577667 — 2020-10 Servicing Stack Update for Windows Server 2019 and Windows 10 Version 1809
KB4577670 — 2020-10 Servicing Stack Update for Windows Server, version 1909, Windows 10 Version 1909, Windows Server 2019 (1903), and Windows 10 Version 1903
KB4580971 — 2020-10 Servicing Stack Update for Windows Server 2008
Known Issues
Windows 7 SP1 and Server 2008 R2
- Updates are reverted if the system is not supported for ESU
- Rename operations may fail on cluster shared volumes
- workaround is to perform the operating from a process that has elevated privileges, or from a node that does not have CSV ownership.
Windows 8.1 and Server 2012 R2
- Third-party driver installation may throw the error “Windows can’t verify the publisher of this driver software” and/or “No signature was present in the subject”.
- Occurs when an improperly formatted catalog file is identified during validation by Windows. Starting with this release, Windows requires the validity of DER encoded PKCS#7 content in catalog files. Microsoft suggests to contact the driver vendor or OEM vendor support to get the issue corrected.
- Rename operations may fail on cluster shared volumes
- workaround is to perform the operating from a process that has elevated privileges, or from a node that does not have CSV ownership.
Windows 10 version 1803
- Third-party driver installation may throw the error “Windows can’t verify the publisher of this driver software” and/or “No signature was present in the subject”.
- Occurs when an improperly formatted catalog file is identified during validation by Windows. Starting with this release, Windows requires the validity of DER encoded PKCS#7 content in catalog files. Microsoft suggests to contact the driver vendor or OEM vendor support to get the issue corrected.
Windows 10 version 1809
- Third-party driver installation may throw the error “Windows can’t verify the publisher of this driver software” and/or “No signature was present in the subject”.
- Occurs when an improperly formatted catalog file is identified during validation by Windows. Starting with this release, Windows requires the validity of DER encoded PKCS#7 content in catalog files. Microsoft suggests to contact the driver vendor or OEM vendor support to get the issue corrected.
- Devices with “some” Asian language packs installed may receive the error “0x800f0982 – PSFX_E_MATCHING_COMPONENT_NOT_FOUND.”
- Microsoft suggests to uninstall and reinstall the language packs, to update Windows 10, or to reset the PC if this does not help.
Windows 10 version 1903 and 1909
- Third-party driver installation may throw the error “Windows can’t verify the publisher of this driver software” and/or “No signature was present in the subject”.
- Occurs when an improperly formatted catalog file is identified during validation by Windows. Starting with this release, Windows requires the validity of DER encoded PKCS#7 content in catalog files. Microsoft suggests to contact the driver vendor or OEM vendor support to get the issue corrected.
- Windows may display a compatibility dialog when trying to update to version 1903 or 1909 from a previous version. This is caused by Windows 10 Setup Dynamic Update being unable to download required packages.
- Needs to enable HTTP access for the Windows 10 Setup Dynamic Update using the LOCAL SYSTEM account.
Windows 10 version 2004
- Third-party driver installation may throw the error “Windows can’t verify the publisher of this driver software” and/or “No signature was present in the subject”.
- Occurs when an improperly formatted catalog file is identified during validation by Windows. Starting with this release, Windows requires the validity of DER encoded PKCS#7 content in catalog files. Microsoft suggests to contact the driver vendor or OEM vendor support to get the issue corrected.
- Users who use the Microsoft Input Method Editor (IME) for Japanese or Chinese may experience issues such as being unable to enter text.
Security advisories and updates
Non-security related updates
KB4578623 — 2020-10 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
Microsoft Office Updates
You find Office update information here.
How to download and install the October 2020 security updates
Windows Update is the main option to install updates on home Windows systems. It is an automated updating system that will download and install available updates automatically. Administrators may download updates manually as well from Microsoft.
System administrators may run a manual check for updates on Windows systems to find out if updates are available; this may be faster than waiting for Windows Update to pick up the new update automatically.
Here is how that is done:
- Open the Start Menu of the Windows operating system, type Windows Update and select the result.
- Select check for updates in the application that opens. Updates may be installed automatically when they are found or offered by Windows; this depends on the operating system and version that is used, and update settings.
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
- KB4580345 — 2020-10 Security Monthly Quality Rollup for Windows 7
- KB4580387 — 2020-10 Security Only Quality Update for Windows 7
Windows 8.1 and Windows Server 2012 R2
- KB4580347 — 2020-10 Security Monthly Quality Rollup for Windows 8.1
- KB4580358 — 2020-10 Security Only Quality Update for Windows 8.1
Windows 10 (version 1803)
- KB4580330 — 2020-10 Cumulative Update for Windows 10 Version 1803
Windows 10 (version 1809)
- KB4577668 — 2020-10 Cumulative Update for Windows 10 Version 1809
Windows 10 (version 1903)
- KB4577671 — 2020-10 Cumulative Update for Windows 10 Version 1903
Windows 10 (version 1909)
- KB4577671 — 2020-10 Cumulative Update for Windows 10 Version 1909
Windows 10 (version 2004)
- KB4579311 — 2020-10 Cumulative Update for Windows 10 Version 2004
Additional resources
Summary
Article Name
Microsoft Windows Security Updates September 2020 overview
Description
DescriptionMicrosoft released security updates and non-security updates for all supported versions of the company’s Windows operating system, client and server, as well as other company products such as Microsoft Office on the September 2020 Patch Day.
Author
Martin Brinkmann
Publisher
Ghacks Technology News
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