Windows 10 Patch Tuesday updates are now live

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Microsoft has begun rolling out the monthly Patch Tuesday updates for Windows 10, bringing cumulative updates to all supported versions across multiple SKUs. As is the case every month, the second Tuesday is the day that all supported Windows versions receive mandatory updates. This time around, Windows 11 is also getting its first Patch Tuesday update and will continue to be served patches along with other supported Windows versions.

For Windows 10, however, the versions currently supported include the three latest releases and a few older versions for specific customers. Versions 2004, 20H2, and 21H1 are receiving KB5006670, bumping up the builds to 19041.1288, 19042.1288, and 19043.1288, respectively. The three versions are built on the same codebase and receiving identical update packages. The next major version, Windows 10 version 21H2 will also receive the same patch for those running the OS in the Release Preview channel.

As for what's new, there are a bunch of improvements and bug fixes, as always. Those that installed the C/D optional preview release that was offered earlier this month will only receive the new bits mentioned below. However, for those that did not install the optional patch, all the fixes will be bundled into KB5006670. You can manually download the update from here.

Here are the highlights of the update package:

  • Updates security for your Windows operating system.

And here is the complete changelog detailing the improvement, in addition to the fixes made via the optional patch:

  • Addresses an issue that prevents some applications, such as Microsoft Office and Adobe Reader, from opening or causes them to stop responding. This occurs on devices that are subject to Microsoft Exploit Protectionfor Export Address Filtering (EAF).

As is generally the case, the Redmond company has also listed the known issues in the update, which is always handy. Here are the known issues for KB5006670:



Devices with Windows installations created from custom offline media or custom ISO image might have Microsoft Edge Legacy removed by this update, but not automatically replaced by the new Microsoft Edge. This issue is only encountered when custom offline media or ISO images are created by slipstreaming this update into the image without having first installed the standalone servicing stack update (SSU) released March 29, 2021 or later.

Note Devices that connect directly to Windows Update to receive updates are not affected. This includes devices using Windows Update for Business. Any device connecting to Windows Update should always receive the latest versions of the SSU and latest cumulative update (LCU) without any extra steps.

To avoid this issue, be sure to first slipstream the SSU released March 29, 2021 or later into the custom offline media or ISO image before slipstreaming the LCU. To do this with the combined SSU and LCU packages now used for Windows 10, version 20H2 and Windows 10, version 2004, you will need to extract the SSU from the combined package. Use the following steps to extract the using SSU:

  1. Extract the cab from the msu via this command line (using the package for KB5000842 as an example): expand Windows10.0-KB5000842-x64.msu /

  2. Extract the SSU from the previously extracted cab via this command line: expand /f:*

  3. You will then have the SSU cab, in this example named Slipstream this file into your offline image first, then the LCU.

If you have already encountered this issue by installing the OS using affected custom media, you can mitigate it by directly installing the new Microsoft Edge. If you need to broadly deploy the new Microsoft Edge for business, see Download and deploy Microsoft Edge for business.

After installing the June 21, 2021 (KB5003690) update, some devices cannot install new updates, such as the July 6, 2021 (KB5004945) or later updates. You will receive the error message, "PSFX_E_MATCHING_BINARY_MISSING".

For more information and a workaround, see KB5005322.

Older Windows 10 versions, such as version 1909, are supported for SKUs such as Enterprise, Education, or IoT Enterprise. Those running Windows 10 version 1809 in the Long Term Servicing Channel are also receiving updates. Here is a summary of the versions, the corresponding KB articles for the updates and links for manual downloads, the build numbers, and the SKUs they are supported in:









Update Catalog

Enterprise, Education, or IoT Enterprise SKUs




Update Catalog

Long Term Servicing Channel (LTSC)




Update Catalog




Update Catalog

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