November 12, 2019—KB4525233 (Security-only update)

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

IMPORTANT Customers who have purchased the Extended Security Update (ESU) for on-premises versions of some operating systems must follow specific procedures to continue receiving security updates after extended support ends on January 14, 2020. For more information, see KB4522133.

Improvements and fixes

This security update includes quality improvements. Key changes include:

• Provides protections against the Intel® Processor Machine Check Error vulnerability (CVE-2018-12207). Use the registry setting as described in the Guidance KB article .(This registry setting is disabled by default.)
• Provides protections against the Intel® Transactional Synchronization Extensions (Intel® TSX) Transaction Asynchronous Abort vulnerability (CVE-2019-11135). Use the registry settings as described in the Windows Client and Windows Server articles .(These registry settings are enabled by default for Windows Client OS editions, but disabled by default for Windows Server OS editions.)
• Security updates to Windows Input and Composition, Microsoft Graphics Component, Windows Cryptography, Windows Virtualization, Windows Kernel, Windows Datacenter Networking, and the Microsoft JET Database Engine.

For more information about the resolved security vulnerabilities, please refer to the Security Update Guide.

Known issues in this update

Microsoft is not currently aware of any issues with this update.

How to get this update

Before installing this update****Prerequisite: You must install the updates listed below and**restart your device** before installing the latest Rollup. Installing these updates improves the reliability of the update process and mitigates potential issues while installing the Rollup and applying Microsoft security fixes.

1. The March 12, 2019 servicing stack update (SSU) (KB4490628). To get the standalone package for this SSU, search for it in the Microsoft Update Catalog.
2. The latest SHA-2 update (KB4474419) released September 10, 2019. If you are using Windows Update, the latest SHA-2 update will be offered to you automatically. For more information on SHA-2 updates, see 2019 SHA-2 Code Signing Support requirement for Windows and WSUS.