Microsoft has released SQL Server 2014 Service Pack 2 Cumulative Update 5, which is Build 12.0.5546.0. There are 24 hotfixes in the public fix list. In my opinion, you should be on the SP2 branch by now. If you have not made that move, you should be making plans to get on SP2 as soon as possible. My blog post below highlights some of the more important fixes in all of the post-SP2 Cumulative Updates:
Microsoft has also released SQL Server 2014 Service Pack 1 Cumulative Update 12, which is Build 12.0.4502.0. There are 12 hotfixes in the public fix list for this CU. My blog post below highlights some of the more important fixes in all of the post-SP1 Cumulative Updates:
There is no corresponding CU for the RTM branch, since SQL Server 2014 RTM is no longer a supported Service Pack level. If you are still on the RTM branch (which is not a good thing), then my blog post below highlights some of the more important fixes in all of the RTM Cumulative Updates:
Finally, if you are wondering why this matters, you might want to read my SQLskills SQL101: SQL Server Maintenance post to find out more about how SQL Server is serviced by Microsoft and why staying current is important.