From release, SCCM 2012 R2 has been extremely solid and you may never run into any of the issues resolved by updates that have been released since; however in working with a Microsoft PFE (Premier Field Engineer) it was recommended to me to stay with the current version or current version -1. And if you read through what has been added in each version CU1 – CU5 you will likely find some nice fixes or additions that you can use in your environment. This is especially true for myself when it comes to the PowerShell improvements.
If you have never installed a SCCM 2012 R2 CU before you don’t need to worry about the previous updates, you can just install the latest version to get the improvements added since release. To read more about and obtain CU5 just take a look at the Microsoft Knowledge Base article here (https://support.microsoft.com/en-us/kb/3054451?wa=wsignin1.0).
The CU5 update can be applied directly to the following:
- Central administration site
- Primary site (Standalone)
- Primary site (Hierarchy)
- Secondary site
- Configuration Manager console
You should apply this update from the top down starting with your CAS if you have one or your Primary if you do not use a CAS.