June 2013 CU for SharePoint 2010 and other Office 2010 product had been removed from the hotfix download servers shortly after the initial release due to an issue which affected many different Office products.
The product group has now re-released the June 2013 Cumulative Update for the affected products including SharePoint.
Be aware that the KB article numbers of the re-released Fixes are different from the original ones.
The KB articles are not yet available but should be in the next couple of days. The fixes can already be downloaded.
It is strongly recommended that customers who installed the initial June CU install the re-released updates.
Be aware that the June Cumulative Update for SharePoint 2010 is a Post-SP1 hotfix. That means that you should ensure that SP1 is installed before the June CU.
The KB articles for the re-released June CU will be availabe at the following locations in a couple of days:
KB 2817552 - SharePoint Foundation 2010
KB 2817527 - SharePoint Server 2010
See Stefan Gobner's blog for more info