August 2021 CU for SharePoint 2013 product family is available for download

The product group released the August 2021 Cumulative Update for the SharePoint 2013 product family.

For August 2021 CU we have full server packages (also known as Uber packages) for all products. No other CU is required to fully patch SharePoint.

As this is a common question: Yes, August 2021 CU includes all fixes from August 2021 PU.


Be aware that all Updates for SharePoint 2013 require SharePoint Server 2013 SP1 to be installed first.

Please also have a look at the article that discusses how to properly patch a SharePoint 2013 farm which has Search enabled (see below).

Previous releases of the SharePoint Server 2013 cumulative update included both the executable and the .CAB file in the same self-extracting executable download. Because of the file size, the SharePoint Server 2013 package has been divided into several separate downloads. One contains the executable file, while the others contain the CAB file. All are necessary and must be placed in the same folder to successfully install the update. All are available by clicking the same Hotfix Download Available link in the KB article for the release.

This CU includes all SharePoint 2013 fixes (including all SharePoint 2013 security fixes) released since SP1. The CU does not include SP1. You need to install SP1 before installing this CU.

The KB articles for August 2021 CU should be available at the following locations in a couple of hours:

  • KB 5002010 – SharePoint Foundation 2013 August 2021 CU
  • KB 5002012 – SharePoint Server 2013 August 2021 CU
  • KB 5002011 – Project Server 2013 August 2021 CU
  • There was no Office Web Apps Server 2013 fix released this month.

The Full Server Packages for August 2021 CU are available through the following links:

After installing the fixes you need to run the SharePoint 2013 Products Configuration Wizard on each machine in the farm. If you prefer to run the command line version psconfig.exe ensure to have a look here for the correct Options.

Be aware that the SharePoint Server 2013 CU contains the SharePoint Foundation 2013 CU. And the Project Server 2013 CU also contains the SharePoint Server 2013 CU and SharePoint Foundation 2013 CU.

Please ensure to have a look at the SharePoint Patching Best Practices before applying new fixes.

Related Info:


  1. Hello Stefan,

    I need to know if the August patch will have any downsides. I am mostly worried about workflows where I have SharePoint 2010 workflows in my SharePoint 2013 environment. The SharePoint 2010 workflows are extremely important for our business and it cant be broken or down.

    Is there any downsides or issue that this patch brings.

    Thank you Sir


    1. Hi Osamah,
      the only potential issue I’m aware for SP2010 workflows is the following change introduced by July security fix:
      It should only affect custom workflow actions and 3rd party workflow implementations.

      As always it is important to evaluate each fix in a test environment against all business critital functions before applying in production to ensure that the fixes do not impact the production system.



  2. Hi Stefan,

    We have observed Nintex workflows are not starting and unable to publish post installation of Aug 2021 CU.

    Is there any permanent fix for this.


    1. Hi Vali,
      I haven’t seen any similar reports about Aug 2021 CU.
      Which CU level did you upgrade from?


      1. Hi Stefan,
        I have upgraded from Dec2020 CU to Aug2021 CU.

        I have contacted MS and Nintex support team. They have confirmed that it is due to Aug2021 CU. I have applied the workaround suggested by MS then it fixed the issue.

        I just want to know if there is any Risk involved or any other implications to disable the security feature for workflow.



        1. Hi Vali,
          ok – so you are running into the behavior change introduced in July CU which was discussed already in the comments above. I thought you were talking about a new issue in August CU.


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