This security update includes improvements and fixes that were a part of update KB4075212 (released February 21, 2018) and addresses the following issues:
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Addresses an issue in which Internet Explorer is unresponsive in certain scenarios when a Browser Helper Object is installed.
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Updates legacy Document Mode cell visibility in Internet Explorer.
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Addresses an issue in which Internet Explorer stops working in certain printing scenarios.
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Addresses an issue in which Internet Explorer stops working when you use F12-based developer tools.
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Addresses an issue in Internet Explorer that causes the Outlook Web App to slow down under certain circumstances.
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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 cumulative 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 Internet Explorer, 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.