Microsoft has released SQL Server 2012 Cumulative Update 5, which is Build 11.0.2395. I count 28 fixes in the public fix list. Some of these fixes look fairly important, so you should take a look at the fix list.
Here are a couple of the more important hotfixes:
This Cumulative Update is only for SQL Server 2012 Cumulative Update 5. It will not work with any other major version of SQL Server or with any other Service Pack Level.
Ideally you should be on the Service Pack 1 branch of SQL Server 2012.