The patch is now ready for Windows Server 2012/2008 (non R2). It was released the 13 March, two day ago.
Small read there too: https://support.microsoft.com/en-us/help/4088877/windows-server-2012-update-kb4088877
Starting in March 2018, Microsoft released security updates to provide
mitigations for devices running the following x64-based Windows
operating systems. Customers should install latest Windows operating
system security updates to take advantage of available protections. We
are working to provide protections for other supported Windows
versions but do not have a release schedule at this time. Please check
back here for updates. For more information, see the related knowledge
base article for technical details and the FAQ later in this article.
Product update released Released Release date Release channel KB
Windows Server 2012 - Security Only Update Windows 8 Embedded Standard
Edition - Security Only Update Released 13-Mar WSUS, Catalog KB4088877
Windows Server 2012 - Monthly Rollup Windows 8 Embedded Standard
Edition - Monthly Rollup Released 13-Mar WU, WSUS, Catalog KB4088877
Windows Server 2008 SP2 Released 13-Mar WU, WSUS, Catalog KB4090450
Description: A security issue has been identified in a Microsoft software product that could affect your system. You can help protect your system by installing this update from Microsoft. For a complete listing of the issues that are included in this update, see the associated Microsoft Knowledge Base article. After you install this update, you may have to restart your system. Architecture: AMD64 , X86
Classification: Security Updates
Supported products: Windows Server 2012
Supported languages: all