Microsoft Windows Security Updates April 2020 overview

Welcome to the overview for Microsoft’s April 2020 Patch Day; Microsoft released security updates for all supported versions of the Windows operating system — client and server — as well as other company products such as Microsoft Office.


Our overview provides you with links and information that you may use to better understand the releases. It includes links to direct downloads, the list of known issues according to Microsoft, an overview of critical security issues, the operating system distribution of vulnerabilities, and more.


Feel free to check out the March 2020 Patch Day overview here.


Microsoft Windows Security Updates April 2020


microsoft windows-security updates april 2020


You may download the following Excel spreadsheet to get a full list of all security updates that Microsoft released on the April 2020 Patch Day. Just click on the following link to download the spreadsheet to your system: microsoft-windows-security-updates-april-2020


Executive Summary


  • Microsoft released security updates for all supported versions of Windows.

  • Security updates are also available for Microsoft Edge, Internet Explorer, Microsoft Office, Windows Defender, Visual Studio, Microsoft Dynamics, Microsoft Apps for Android and Mac.

  • New msi application installation issue for domain devices on some versions of Windows.

Operating System Distribution


  • Windows 7  (extended support only): 37 vulnerabilities: 5 critical and 32 important
    • CVE-2020-0907 | Microsoft Graphics Components Remote Code Execution Vulnerability

    • CVE-2020-0687 | Microsoft Graphics Remote Code Execution Vulnerability

    • CVE-2020-0938 | Adobe Font Manager Library Remote Code Execution Vulnerability

    • CVE-2020-1020 | Adobe Font Manager Library Remote Code Execution Vulnerability

    • CVE-2020-0965 | Microsoft Windows Codecs Library Remote Code Execution Vulnerability


  • Windows 8.1: 39 vulnerabilities: 3 rated critical and 52 rated important
    • same as Windows 7


  • Windows 10 version 1803: 60 vulnerabilities: 6 critical and 54 important
    • CVE-2020-0907 | Microsoft Graphics Components Remote Code Execution Vulnerability

    • CVE-2020-0687 | Microsoft Graphics Remote Code Execution Vulnerability

    • CVE-2020-0948 | Media Foundation Memory Corruption Vulnerability

    • CVE-2020-0949 | Media Foundation Memory Corruption Vulnerability

    • CVE-2020-0950 | Media Foundation Memory Corruption Vulnerability

    • CVE-2020-0965 | Microsoft Windows Codecs Library Remote Code Execution Vulnerability


  • Windows 10 version 1809: 63 vulnerabilities: 7 critical and 56 important
    • Same as Windows 10 version 1803 plus

    • CVE-2020-0910 | Windows Hyper-V Remote Code Execution Vulnerability


  • Windows 10 version 1903: 67 vulnerabilities: 8 critical and 59 important
    • Same as Windows 10 version 1809 plus

    • CVE-2020-0796 | Windows SMBv3 Client/Server Remote Code Execution Vulnerability


  • Windows 10 version 1909: 
    • same as Windows 10 version 1903


Windows Server products


  • Windows Server 2008 R2 (extended support only): 32 vulnerabilities, 5 critical, 42 important
    • CVE-2020-0907 | Microsoft Graphics Components Remote Code Execution Vulnerability

    • CVE-2020-0687 | Microsoft Graphics Remote Code Execution Vulnerability

    • CVE-2020-0938 | Adobe Font Manager Library Remote Code Execution Vulnerability

    • CVE-2020-0965 | Microsoft Windows Codecs Library Remote Code Execution Vulnerability

    • CVE-2020-1020 | Adobe Font Manager Library Remote Code Execution Vulnerability


  • Windows Server 2012 R2: 37 vulnerabilities: 4 critical and 32 important.
    • Same as Windows Server 2008 R2.


  • Windows Server 2016: 51 vulnerabilities: 6 critical and 45 important.
    • CVE-2020-0907 | Microsoft Graphics Components Remote Code Execution Vulnerability

    • CVE-2020-0965 | Microsoft Windows Codecs Library Remote Code Execution Vulnerability

    • CVE-2020-0950 | Media Foundation Memory Corruption Vulnerability

    • CVE-2020-0949 | Media Foundation Memory Corruption Vulnerability

    • CVE-2020-0948 | Media Foundation Memory Corruption Vulnerability

    • CVE-2020-0687 | Microsoft Graphics Remote Code Execution Vulnerability


  • Windows Server 2019: 63 vulnerabilities: 7 critical and 65 are important
    • same as Windows Server 2016 plus

    • CVE-2020-0910 | Windows Hyper-V Remote Code Execution Vulnerability


Other Microsoft Products


  • Internet Explorer 11: 4 vulnerability: 2 critical, 2 important

  • Microsoft Edge:  2 vulnerabilities: 2 critical
    • CVE-2020-0969 | Chakra Scripting Engine Memory Corruption Vulnerability

    • CVE-2020-0970 | 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 Server 2008 R2


Fixes and improvements:


  • Fixed the long-standing issue on Cluster Shared Volumes that caused some operations to fail.

  • Security updates.

Windows 8.1 and Windows Server 2012 R2


Fixes and improvements:


  • Security updates.

Windows 10 version 1803


Fixes and improvements:


  • Security updates.

Windows 10 version 1809


Fixes and improvements:


  • Fixed an issue that prevented apps from installing if they are published using GPO.

  • Security updates.

Windows 10 version 1903 and 1909


Fixes and improvements:


  • Fixed an issue that prevented apps from installing if they are published using GPO.

  • Security updates.

Other security updates


KB4550905 — Cumulative security update for Internet Explorer: April 14, 2020


KB4550917 — Security Monthly Quality Rollup for Windows Embedded 8 Standard and Windows Server 2012


KB4550951 — Security Monthly Quality Rollup for Windows Server 2008


KB4550957 — Security Only Quality Update for Windows Server 2008


KB4550971 — Security Only Quality Update for Windows Embedded 8 Standard and Windows Server 2012


KB4549947 — Servicing Stack Update for Windows Server 2019 and Windows 10 Version 1809


KB4550737 — Servicing Stack Update for Windows Server 2008


KB4550738 — Servicing Stack Update for Windows Embedded Standard 7, Windows 7, and Windows Server 2008 R2


KB4550927 — Cumulative Update for Windows 10 Version 1709


KB4550929 — Cumulative Update for Windows Server 2016 and Windows 10 Version 1607


KB4550930 — Cumulative Update for Windows 10 Version 1507


KB4550939 — Cumulative Update for Windows 10 Version 1703


KB4550992 — Servicing Stack Update for Windows 10 Version 1703


KB4550994 — Servicing Stack Update for Windows Server 2016 and Windows 10 Version 1607


KB4552152 — Servicing Stack Update for Windows Server, version 1909, Windows 10 Version 1909, Windows Server, version 1903, and Windows 10 Version 1903


Known Issues


Windows 7 SP1 and Server 2008 R2


  • Device may display the error “Failure to configure Windows updates. Reverting Changes. Do not turn off your computer” after installing the update.

  • Devices on domains may fail to install apps published using GPO. Affects only app installations that use .msi files. (mitigation: manual install) (only affects Monthly Rollup)

Windows 8.1 and Windows Server 2012 R2


  • Certain operations on Cluster Shared Volumes may fail.

  • Devices on domains may fail to install apps published using GPO. Affects only app installations that use .msi files. (mitigation: manual install) (only affects Monthly Rollup)

Windows 10 version 1803


  • Devices on domains may fail to install apps published using GPO. Affects only app installations that use .msi files. (mitigation: manual install)

Windows 10 version 1809


  • Installations with some Asian language packs installed may throw the error “0x800f0982 – PSFX_E_MATCHING_COMPONENT_NOT_FOUND”.

Security advisories and updates


ADV200006 | Type 1 Font Parsing Remote Code Execution Vulnerability


Non-security related updates


KB4549950 — Dynamic Update for Windows 10 Version 1909, and Windows 10 Version 1903


Microsoft Office Updates


You find Office update information here.


How to download and install the April 2020 security updates


Microsoft releases security updates through various channels including Windows Update, WSUS, other update services, as well as the Microsoft Update Catalog website.


It is highly recommended that backups are created before any type of update is installed.


Do the following to check for new updates:


  1. Open the Start Menu of the Windows operating system, type Windows Update and select the result.

  2. 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


Windows 7 and Server 2008 R2


  • KB4550964 — 2020-04 Security Monthly Quality Rollup for Windows 7

  • KB4550965 — 2020-04 Security Only Quality Update for Windows 7

Windows 8.1 and Windows Server 2012 R2


  • KB4550961 — 2020-04 Security Monthly Quality Rollup for Windows 8.1

  • KB4550970 — 2020-04 Security Only Quality Update for Windows 8.1

Windows 10 (version 1803)


  • KB4550922 — 2020-04 Cumulative Update for Windows 10 Version 1809

Windows 10 (version 1809)


  • KB4549949  — 2020-04 Cumulative Update for Windows 10 Version 1809

Windows 10 (version 1903)


  • KB4549951 — 2020-04 Cumulative Update for Windows 10 Version 1903

Windows 10 (version 1909)


  • KB4549951 — 2020-04 Cumulative Update for Windows 10 Version 1909

Additional resources


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