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Release Date:



Monthly Rollup

Important The installation of this Extended Security Update (ESU) might fail when you try to install it on an Azure Arc-enabled device that is running Windows Server 2012. For a successful installation, please make sure all Subset of endpoints for ESU only are met as described in Connected Machine agent network requirements.


Learn more about this cumulative security update, including improvements, any known issues, and how to get the update.

Note Verify that you have installed the required updates listed in the How to get this update section before installing this update.

For information about the various types of Windows updates, such as critical, security, driver, service packs, and so on, please see the following Description of the standard terminology that is used to describe Microsoft software updates. To view other notes and messages, see the Windows Server 2012 update history home page.


This cumulative security update contains improvements that are part of update KB5039260 (released June 11, 2024). The following is a summary of the key issues that this update addresses. The bold text within the brackets indicates the item or area of the change we are documenting.

  • [DST] The official name of the former “Republic of Turkey” is changed to Republic of Türkiye in English. For more information about DST changes, see the Daylight Saving Time & Time Zone Blog.

  • [IME] In some scenarios, an Input Method Editor (IME) will either not show or show in an incorrect position.

  • [RADIUS protocol] A security vulnerability exists in the Remote Authentication Dial-In User Service (RADIUS) protocol related to MD5 collision problems. For more information, see KB5040268.

  • [Windows Installer] When the installer repairs an application, the User Account Control (UAC) does not prompt for your credentials. After you install this update, the UAC will prompt for them. Because of this, you might have to update your Automation scripts and add the Shield icon. This indicates that the process requires full administrator access. To turn off the UAC prompt, set the HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\Installer\DisableLUAInRepair registry value to 1. For more information, see:

For more information about the resolved security vulnerabilities, please refer to the Deployments | Security Update Guide and the July 2024 Security Updates.

We are currently not aware of any issues with this update.

How to get this update

Before installing this update

We strongly recommend that you install the latest servicing stack update (SSU) for your operating system before installing the latest Rollup. SSUs improve the reliability of the update process to mitigate potential issues while installing the Rollup and applying Microsoft security fixes. For general information about SSUs, see Servicing stack updates and Servicing Stack Updates (SSU): Frequently Asked Questions.

If you use Windows Update, the latest SSU (KB5040570) will be offered to you automatically. To get the standalone package for the latest SSU, search for it in the Microsoft Update Catalog.

Language packs

If you install a language pack after you install this update, you must reinstall this update. Therefore, we recommend that you install any language packs that you need before you install this update. For more information, see Learn about adding a language pack to Windows.

Install this update

To install this update, use one of the following release channels.


Next step


This update will be downloaded and installed automatically from Windows Update.


Next step


To get the standalone package for this update, go to the Microsoft Update Catalog website.

To download updates from the Update Catalog, see Steps to download updates from the Windows Update Catalog.


Next step


This update will automatically sync if you configure Products and Classifications as follows:

  • Product: Windows Server 2012

  • Classification: Security Updates

For more information about configuring in WSUS, see Windows Server Update Services (WSUS).

For more information about configuring in Configuration Manager, see Synchronize software updates.

File information

For a list of the files that are provided in this update, download the file information for update KB5040485.

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