#SCCM 2012R2 - Determine SCCM 2012 CU version

1. Launch registry, navigate HKLM\Software\Microsoft\SMS\Setup
2. On right panel, check on CULevel.

or Power Shell 

• Get-ItemProperty -Path HKLM:\SOFTWARE\Microsoft\SMS\Setup -Name "CULevel"

CULevel value is (0). Mean no CU installed.