On March 21, 2016, Microsoft released SQL Server 2012 Service Pack 3 CU2, which is Build 11.0.6523.0. This Cumulative Update has 20 hotfixes in the Public fix list, which is a relatively low number for a SQL Server 2012 Cumulative Update.

If you are running SQL Server 2012, I think you should be moving to the SP3 branch pretty soon, if you have not done so already. The SP2 branch is still supported until November 2016, but the RTM and SP1 branches are no longer supported.

Here are links to the Microsoft CU lists for both current Service Packs.

SQL Server 2012 SP2 build versions

SQL Server 2012 SP3 build versions