Few days ago we wrote about security update MS13-061, after installation it caused few errors in Exchange 2013 environment.
We wrote about this here:
This security update was removed from Microsoft Download Center on 08/14/2013
Today Exchange Team released updated security updates for both Exchange 2013 RTM CU1 and Exchange 2013 RTM CU2.
You can download security update here:
As always we recommend to test updates in lab environment first.
More information you can find on Exchange Team Blog