The latest cumulative update for ConfigMgr 2012 SP2 and R2 SP1 CU1 was released on 04.08.15. Here’s the install guide for the hotfix.
Download the hotfix from here https://support.microsoft.com/en-us/kb/3074857
Unzip the .zip file and execute the CM12_SP2R2SP1CU1-KB3074857-X64-ENU.exe.
Accept the licence terms and click Next.
Address anything in the pre-req check.
Update the console
Update the site database
Create the deployment packages.
The update process will commence.
Looking good! Click Next.
Click Finish to complete the installation.
You will now be running version 5.0.8289.1203 console and client versions.