Download and Install KB4549951 Windows 10 Cumulative Update For April 2020 [Version 1909, 1903]

It’s time to patch Windows 10 again as April’s Patch Tuesday has arrived. Microsoft has released cumulative update KB4549951 for Windows 10 Version 1909 and 1903 which will take the complete build of your OS to 1903-OS Build 18362.778 and 1909-OS Build 18363.778.

Unlike the previously released cumulative update, this update is mandatory and will be installed on your system by default. If you have not installed any of the previous updates, this update will install them for you.

Quick Facts about KB4549951

  • Release date: 14th April 2020
  • Operating Systems Support: Windows 10 Version 1909, Windows 10 Version 1903
  • Build no. after installing KB4549951: 1903-OS Build 18362.778 and 1909-OS Build 18363.778

What’s new in KB4549951 update

This update comes with three critical zero-day fixes to Windows 10 OS. A total of 113 vulnerabilities have been fixed in Microsoft products which includes 15 critical, 93 important, 3 moderate and 2 low level vulnerabilities.

Here is the list of security improvements from knowledgebase released by Microsoft.

  • Addresses an issue that prevents certain apps from being installed if they are published using a Group Policy Object.
  • Addresses an issue that prevents a wired network interface from obtaining a new Dynamic Host Configuration Protocol (DHCP) IP address on new subnets and virtual LANs (VLAN) after wired 802.1x re-authentication. The issue occurs if you use VLANs that are based on accounts and a VLAN change occurs after a user signs in.
  • Security updates to Microsoft Scripting Engine, Windows App Platform, Frameworks, Windows Cloud Infrastructure, Windows Virtualization, Microsoft Graphics Component, Windows Kernel, Windows Media, Windows Shell, Windows Management, Windows Fundamentals, Windows Virtualization, Windows Storage, Filesystems, Windows Update Stack, and the Microsoft JET Database Engine.

And here is the breakdown of each vulnerability fix with respect to the Microsoft product:

Windows DefenderCVE-2020-0835, CVE-2020-1002
Windows UpdateCVE-2020-0985, CVE-2020-0996, CVE-2020-0983, CVE-2020-1014
WindowsCVE-2020-0794, CVE-2020-0944, CVE-2020-1001, CVE-2020-1006, CVE-2020-1029, CVE-2020-0934, CVE-2020-0940, CVE-2020-0942, CVE-2020-0965, CVE-2020-0981, CVE-2020-1009, CVE-2020-1011, CVE-2020-1016, CVE-2020-1017, CVE-2020-1094
Windows KernelCVE-2020-0913, CVE-2020-0955, CVE-2020-1000, CVE-2020-1003, CVE-2020-1007, CVE-2020-1027, CVE-2020-0699, CVE-2020-0821, CVE-2020-0888, CVE-2020-0936, CVE-2020-0956, CVE-2020-0957, CVE-2020-0962, CVE-2020-1015
Windows DNSCVE-2020-0993
Remote Desktop ClientCVE-2020-0919
Windows MediaCVE-2020-0945, CVE-2020-0946, CVE-2020-0947, CVE-2020-0948, CVE-2020-0949, CVE-2020-0950, CVE-2020-0937, CVE-2020-0939

If you want more information about each vulnerability, you can go through Microsoft Security Update April release notes.

Of all the vulnerabilities, the following vulnerabilities are the most critical. This update must be installed if you are using any Adobe product on your system.

  • CVE-2020-0935 – OneDrive for Windows Elevation of Privilege Vulnerability
  • CVE-2020-1020 – Adobe Font Manager Library Remote Code Execution Vulnerability
  • CVE-2020-0938 and CVE-2020-1020 – Adobe Font Manager Library Remote Code Execution Vulnerability

Install KB4549951 using Windows Update

To install this update using Windows Update, please go to Windows Settings –> Update & Security –> Windows Update. In the right-hand pane, click on the Check for updates button.

You will see the following under Optional updates available:

2020-04 Cumulative Update for Windows 10 Version 1909 for x64-based Systems (KB4549951)

Installing KB4549951 in Windows 10
Installing KB4549951 in Windows 10

Since this is a mandatory update, it will download and install automatically. Once installed, you will need to restart the system for the changes to take effect.

Download KB4549951 Offline installers

You can also download this cumulative update and then install it on any system without requiring any Internet connection.

Download KB4549951 for Windows 10 Version 1909 32-bit [193.1 MB]

Download KB4549951 for Windows 10 Version 1909 64-bit [358 MB]

Download KB4549951 for Windows 10 Version 1903 32-bit [193.1 MB]

Download KB4549951 for Windows 10 Version 1903 64-bit [358 MB]

To install the update, simply run the downloaded MSU file and Windows will automatically install the cumulative update. After installing this update, the Operating System build number will be 18363.778 for Windows 10 Version 1909 and 18362.778 for Windows 10 Version 1903.

You can check your current Windows build by going to Run –> winver.

Uninstall KB4554364 cumulative update

At the time of this writing, I did not find any problem being discussed in different forums regarding this update.

However, if you are having issues with this update, it can be uninstalled in two ways:

Uninstall KB4549951 using Windows Update History tool

  1. Go to Windows Settings (Windows key + i) –> Update & Security –> Windows Update.
  2. From the right-hand pane, click on View Update History.
  3. Now click on Uninstall updates.
  4. Select Update for Microsoft Windows (KB4549951) and press the Uninstall button.

Uninstall KB4549951 using command-line

Another quick way to uninstall this update is by using the command prompt. Here are the commands:

  1. Open Command Prompt (Run –> cmd)
  2. Run the following command:
    wmic qfe list brief /format:table
  3. This will show all the updates installed on the computer. Make sure KB4549951 is on the list.
  4. To uninstall the update, run the following command
    wusa /uninstall /kb:4549951

The system needs to be restarted after uninstalling the update.

Similar fixes are also available for earlier versions of Windows. You can go through them here:

Windows 10 Version 1809KB4549949 (OS Build 17763.1158)Download
Windows 10 Version 1803KB4550922 (OS Build 17134.1425)Download
Windows 10 Version 1709KB4550927 (OS Build 16299.1806)Download
Windows 10 Version 1703KB4550939 (OS Build 15063.2346)Download
Windows 10 Version 1607KB4550929 (OS Build 14393.3630)Download
Windows 10 Version 1507KB4550930 (OS Build 10240.18545)Download

Usman Khurshid

Usman Khurshid is a seasoned IT Pro with over 15 years of experience in the IT industry. He has experience in everything from IT support, helpdesk, sysadmin, network admin, and cloud computing. He is also certified in Microsoft Technologies (MCTS and MCSA) and also Cisco Certified Professional in Routing and Switching. Reach him at Twitter @usmank11

2 thoughts on “Download and Install KB4549951 Windows 10 Cumulative Update For April 2020 [Version 1909, 1903]

  1. I no longer consider it safe to save research work on my desktop drive after a very recent read/write error message and only half the file loaded. Thankfully all my work is backed up. But days of work recently lost have to be redone. I uninstalled KB4549951 twice and as quick as a wink they slipped it back in, once demanding I turn on Wi-Fi. After the frozen tray incident I used Ctrl-Alt-Detete to gain access to the search line and control panel to uninstall the update. Updates send shivers up my spine. They are like a box of chocolate. You never know what you’re gonna get – Forrest Gump. I’ve been working with computers for nigh on forty years.

    1. Thank you for your thoughts Wayne. Next time I’ll keep in mind to also share a method on how to block that specific update from installing on the PC because uninstalling is not enough nowadays.

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