July 8, 2025—KB5062570 (OS Build 25398.1732)
Applies To
Windows Server, version 23H2Release Date:
7/8/2025
Version:
OS Build 25398.1732
Windows Secure Boot certificate expirationImportant: Secure Boot certificates used by most Windows devices are set to expire starting in June 2026. This might affect the ability of certain personal and business devices to boot securely if not updated in time. To avoid disruption, we recommend reviewing the guidance and taking action to update certificates in advance. For details and preparation steps, see Windows Secure Boot certificate expiration and CA updates.
To learn about Windows update terminology, see the pages on types of Windows updates and monthly quality update types. For an overview, see the update history page for Windows Server, version 23H2.
ImprovementsÂ
This security update includes improvements that were a part of update KB5060118 (released June 10, 2025) and KB5063774 (released July 1, 2025). The following summary outlines key issues addressed by the KB update after you install it. Also, included are available new features. The bold text within the brackets indicates the item or area of the change.
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[DNS Server]Â Fixed: This update addresses an issue where a full zone transfer cannot be completed from a Windows DNS Server to another DNS Server when Extension Mechanisms for DNS is enabled.
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[Language and character support]​​​​​​​ Fixed: An issue that affected some Chinese characters and experienced compliance issue with GB18030. These characters didn’t display correctly or weren’t accepted when using extended Unicode. A modern ICU-based solution now properly supports GB18030-2022 requirements.
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[Performance]Â Fixed: This update addresses an issue that prevented the complete removal of unused language packs and Feature on Demand packages, which previously led to unnecessary storage use and longer Windows Update installation times.
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[Security]​​​​​​​ This update upgrades the curl tool in Windows to version 8.13.0 to help protect against potential security risks, including unauthorized access to data or service disruptions.
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[Microsoft RPC Netlogon protocol] This update includes a security hardening change to the Microsoft RPC Netlogon protocol. This change improves security by tightening access checks for a set of remote procedure call (RPC) requests. After this update is installed, Active Directory domain controllers will no longer allow anonymous clients to invoke some RPC requests through the Netlogon RPC server. These requests are typically related to domain controller location. Certain file and print service software can be affected, including Samba. If your organization uses Samba, please refer to the Samba release notes. ​​​​​​​
For more information about security vulnerabilities, see the Security Update Guide and the July 2025 Security Updates.Â
Windows Server, version 23H2 servicing stack update (KB5062685)Â - 25398.1720
This update makes quality improvements to the servicing stack, which is the component that installs Windows updates. Servicing stack updates (SSU) ensure that you have a robust and reliable servicing stack so that your devices can receive and install Microsoft updates. To learn more about SSUs, see Simplifying on-premises deployment of servicing stack updates.
Known issues in this update​​​​​​​
Microsoft is not currently aware of any issues with this update.
How to get this update
Before you install this update
Microsoft now combines the latest servicing stack update (SSU) for your operating system with the latest cumulative update (LCU). For general information about SSUs, see Servicing stack updates and Servicing Stack Updates (SSU): Frequently Asked Questions.
Install this update
To install this update, use one of the following Windows and Microsoft release channels.
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Available |
Next Step |
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None. This update will be downloaded and installed automatically from Windows Update and Microsoft Update. |
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Available |
Next Step |
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None. This update will be downloaded and installed automatically from Windows Update for Business in accordance with configured policies. |
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Available |
Next Step |
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Yes 1 |
To get the standalone package for this update, go to the Microsoft Update Catalog website. |
1 This latest cumulative update includes updates for AI components. Even though the AI component updates are included in the update, the AI components are only applicable to Windows Copilot+ PCs and will not install on Windows PC or Windows Server.
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Available |
Next Step |
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This update will automatically sync with Windows Server Update Services (WSUS) if you configure Products and Classifications as follows: Product: Microsoft Server operating system-21H2 Classification: Security Updates |
If you want to remove the LCU
To remove the LCU after installing the combined SSU and LCU package, use the DISM/Remove-Package command line option with the LCU package name as the argument. You can find the package name by using this command: DISM /online /get-packages.
Running Windows Update Standalone Installer (wusa.exe) with the /uninstall switch on the combined package will not work because the combined package contains the SSU. You cannot remove the SSU from the system after installation.
File InformationÂ
For a list of the files provided in this update, download the file information for cumulative update 5062570.
For a list of the files provided in the servicing stack update, download the file information for the SSU (KB5062685) - version 25398.1720.Â
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