Windows Server 2012 R2 missing newer updates since April 2014.
book
Article ID: 164306
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Updated On:
Products
Patch Management Solution for Windows
Cause
Windows Server 2012 R2 CU1 is a prerequisite for newer updates. Reference: https://support.microsoft.com/en-us/help/2919355/windows-rt-8.1,-windows-8.1,-and-windows-server-2012-r2-update-april-2014
Resolution
Install all 2014 applicable Windows updates and this would allow for newer updates, including KB2919355 (CU1).