On August 17, 2015, Microsoft released SQL Server 2014 SP1 Cumulative Update 2, which is Build 12.0.4422. This CU has 44 hotfixes in the public fix list, which is a relatively high number. This shows that Microsoft has been busy fixing important SQL Server issues, and it also underscores the importance of paying attention to cumulative updates and making an effort to stay current with your builds of SQL Server.
They also released SQL Server 2014 RTM CU9, which is Build 12.0.2553. This CU has 30 hotfixes in the public fix list. Personally, I think you should be moving to the SQL Server 2014 SP1 branch by now, or in the very near future, rather than staying on the RTM branch much longer.