The KB articles for June CU are available at the following locations:
KB 2881063 - SharePoint Foundation 2013 June 2014 CU
KB 2881061 - SharePoint Server 2013 June 2014 CU
KB 2881062 - SharePoint Server 2013 with Project Server June 2014 CU
KB 2881051 - Office Web Apps Server 2013 - be aware that Office Web Apps Server 2013 fixes will be released with a different cadence to SharePoint in the future.
The Full Server Packages for June 2014 CU are available through the following links:
After installing the fixes you need to run the SharePoint 2013 Products Configuration Wizard on each machine in the farm.
Be aware that the SharePoint Server 2013 CU contains the SharePoint Foundation CU. And the SharePoint Server 2013 with Project Server CU contains Project Server CU, SharePoint Server CU and SharePoint Foundation CU.