September 10, 2019—KB4516051 (Security-only update)

2019-09-1007:00:00

Microsoft

support.microsoft.com

750

7.7 High

AI Score

Confidence

High

0.279 Low

EPSS

Percentile

96.9%

Improvements and fixes

This security update includes quality improvements. Key changes include:

Provides protections against a new subclass of speculative execution side-channel vulnerabilities, known as Microarchitectural Data Sampling, for 32-Bit (x86) versions of Windows (CVE-2019-11091, CVE-2018-12126, CVE-2018-12127, CVE-2018-12130). Use the registry settings as described in the Windows Server article_. _(These registry settings are enabled by default for Windows Server OS editions.)
Security updates to Windows App Platform and Frameworks, Windows Kernel, Windows Input and Composition, Windows Media, Windows Authentication, Windows Datacenter Networking, Windows Storage and Filesystems, the Microsoft JET Database Engine, and Windows Server .
For more information about the resolved security vulnerabilities, please refer to the Security Update Guide.

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

Before installing this updateMicrosoft strongly recommends you install the latest servicing stack update (SSU) for your operating system before installing the latest Rollup. SSUs improve the reliability of the update process to mitigate potential issues while installing the Rollup and applying Microsoft security fixes. If you are using Windows Update, the latest SSU (KB4517134) will be offered to you automatically. To get the standalone package for the latest SSU, search for it in the Microsoft Update Catalog.Install this update****Release Channel	Available	Next Step
Windows Update and Microsoft Update	No	See the other options below.
Microsoft Update Catalog	Yes	To get the standalone package for this update, go to the Microsoft Update Catalog website.
Windows Server Update Services (WSUS)	Yes	This update will automatically synchronize with WSUS if you configure Products and Classifications as follows:Product: Windows Server 2008 Service Pack 2Classification: Security Updates File informationFor a list of the files that are provided in this update, download the file information for update 4516051.