On August 14th, ExchangeTeam announced the removal of the MS13-061 Security Update for Exchange Server 2013 due to an issue where the patch changed settings for the search infrastructure, placing the content index for all databases into a failed state. As of today, we have released updated security updates for both Exchange 2013 RTM CU1 and Exchange 2013 RTM CU2.
Download links for MS13-061: