Mandatory Windows 10 Update KB5063709 Delivers Critical Security Fixes, Addresses ESU Enrollment Bug
Mandatory Windows 10 Update KB5063709 Delivers Critical Security Fixes, Addresses ESU Enrollment Bug
Microsoft has released the crucial KB5063709 cumulative update for Windows 10 versions 22H2 and 21H2. This mandatory update, part of the July 2025 Patch Tuesday cycle, is vital for all Windows 10 users as it addresses a significant zero-day vulnerability and 136 other security flaws.
Beyond the extensive security patches, KB5063709 also includes a critical fix for a bug that was preventing users from successfully enrolling in Windows 10’s Extended Security Updates (ESU) program. Given that Windows 10 is approaching its end-of-life in October 2025, ensuring smooth ESU enrollment is paramount for organizations and users requiring continued security support.
The update also brings several other improvements, including updates to Country and Operator Settings Asset (COSA) profiles, new capabilities for deploying SKUSiPolicy VBS Anti-rollback protections via Secure Boot, and fixes for rare file system stability issues observed after recent updates. Input method problems, such as those affecting Microsoft Changjie, emoji search, and phonetic keyboards, have also been resolved.
Users can install this essential update by navigating to Settings, selecting Windows Update, and manually performing a ‘Check for Updates.’ As a mandatory update, it will begin installing automatically once detected. Alternatively, the KB5063709 update can be manually downloaded and installed from the Microsoft Update Catalog. Microsoft reports no known issues with this release.
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