KB5061018: Overview with user sentiment and feedback

Overview

KB5061018 is a Security Monthly Quality Rollup for Windows Server 2012 R2 released on June 10, 2025. This update is part of Microsoft's Extended Security Update (ESU) program for Windows Server 2012 R2, which reached its end of support on October 10, 2023. The ESU program will continue providing security updates for three years on an annual subscription basis until the final end date of October 13, 2026.This cumulative security update builds upon previous updates, specifically including improvements that were part of KB5058403 (released May 13, 2025). The update primarily focuses on miscellaneous security improvements to internal Windows OS functionality. As with most security updates, it's designed to address vulnerabilities and enhance the overall security posture of the operating system.It's important to note that before installing this update, users must first install the latest Servicing Stack Update (SSU) KB5058529. Without the latest SSU, this update will not be offered to the device or cannot be installed. This prerequisite is crucial for ensuring proper update installation and system stability.

General Purpose

The primary purpose of KB5061018 is to provide essential security improvements for Windows Server 2012 R2 systems that are enrolled in the Extended Security Update program. This update specifically addresses security vulnerabilities within the internal Windows OS functionality, helping to protect systems from potential exploits and security threats.The update is designed to maintain the security integrity of Windows Server 2012 R2 systems that are still in use beyond the official end of support date. By applying this update, organizations can continue to operate these servers with reduced security risks while they plan and implement their migration to newer Windows Server versions. Microsoft strongly recommends upgrading to a later version of Windows Server as the ultimate solution, as the ESU program is only a temporary measure to provide additional time for migration planning.

General Sentiment

The general sentiment toward KB5061018 appears to be mixed. While Microsoft officially states there are no known issues with this update, there has been at least one report of a significant problem from a user. A domain controller administrator reported that after applying KB5061018 to a Windows Server 2012 R2 domain controller, the lsass.exe process began consuming high CPU resources. The issue was severe enough that the administrator rolled back the update, which reportedly resolved the problem.This single report suggests that there might be potential issues with the update in specific domain controller environments, though it's unclear how widespread this problem might be. The lack of additional reports could indicate this is an isolated incident possibly related to the specific configuration of that particular server rather than a widespread issue affecting all installations of the update.For IT administrators managing Windows Server 2012 R2 domain controllers, this reported issue might warrant additional caution and testing before deploying the update in production environments, particularly monitoring for high CPU usage by the lsass.exe process after installation.

Known Issues

• The installation of this Extended Security Update (ESU) might fail when attempting to install it on an Azure Arc-enabled device running Windows Server 2012 R2. To ensure successful installation, verify that all required endpoints for ESU are properly configured as described in the Connected Machine agent network requirements.* A user has reported that after applying KB5061018 on a Windows Server 2012 R2 domain controller, the lsass.exe process consumed high CPU resources. Rolling back the update resolved the issue.

Disclaimer: We take measures to ensure that AI-generated content is of the highest possible quality, but we cannot guarantee its accuracy and recommend that users do their own independent research. Generated on 2025-07-31 08:19 PM

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