Today the Exchange team released security bulletin MS13-105. Updates are being made available for the following versions of Exchange Server:
- Exchange Server 2007 SP3
- Exchange Server 2010 SP2
- Exchange Server 2010 SP3
- Exchange Server 2013 CU2
- Exchange Server 2013 CU3
Customers who are not running one of these versions will need to upgrade to an appropriate version in order to receive the update.
Read more at source: http://blogs.technet.com/b/exchange/archive/2013/12/10/released-microsoft-security-bulletin-ms13-105-for-exchange.aspx