This security update includes improvements and fixes that were a part of update KB4512512 (released August 17, 2019) and addresses the following issues:
- 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 Client article. (These registry settings are enabled by default for Windows Client OS editions.)
- Security updates to the Microsoft Scripting Engine, 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.