KB5066875: Overview with user sentiment and feedback
Last Updated November 30, 2025
Probability of successful installation and continued operation of the machine
Overview
This security update for Windows Server 2012 includes fixes and quality improvements that are part of the September 9, 2025 KB5065509 (Monthly Rollup) update. The update addresses a stability issue that was observed in rare cases after installing the May 2025 security update and subsequent updates, causing some devices to become unresponsive and stop responding in specific scenarios. Additionally, this update removes the ltmdm64.sys driver, meaning fax modem hardware dependent on this driver will no longer work in Windows.
General Purpose
The main purpose of this update is to address stability issues and remove a problematic fax modem driver. The stability fix addresses a rare issue that could cause devices to become unresponsive after installing previous updates. By removing the ltmdm64.sys driver, the update will break functionality for any fax modem hardware relying on that driver. Overall, this appears to be a routine monthly security and quality rollup for Windows Server 2012 with a couple of targeted fixes.
General Sentiment
The sentiment around this update appears to be neutral to slightly negative. While the stability fix is a welcome improvement, the removal of the fax modem driver functionality will likely frustrate some users who rely on that legacy hardware. However, since fax modems are becoming increasingly uncommon, the impact of this change may be limited. Overall, this seems like a fairly routine update that addresses some minor issues, but doesn't introduce any major new features or changes.
Known Issues
- The installation of this Extended Security Update (ESU) might fail when trying to install it on an Azure Arc-enabled device that is running Windows Server 2012. To ensure a successful installation, users must make sure all Subset of endpoints for ESU only are met as described in the Connected Machine agent network requirements.
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 2025-11-30 07:14 PM
