This security update includes quality improvements. No new operating system features are being introduced in this update. Key changes include:
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Addresses an issue in which customers sometimes can't sign in to Windows 2012 R2 servers when they use a custom credential provider on a console or RDP.
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Provides Spectre and Meltdown protection for 32-Bit (x86) and 64-Bit (x64) versions of Windows except the KB4078130 update that was offered to disable mitigation against Spectre Variant 2.
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Provides security updates to the Microsoft Graphics component, Windows Kernel, Windows Shell, Windows MSXML, Windows Installer, and Windows Hyper-V.
For more information about the resolved security vulnerabilities, see the Security Update Guide.