Microsoft has released Exchange 2013 CU9 and Update rollups, please see the blog post :
The Exchange team is announcing today the availability of our latest quarterly updates for Exchange Server 2013 as well as updates for Exchange Server 2010 Service Pack 3 and Exchange Server 2007 Service Pack 3.
Cumulative Update 9 for Exchange Server 2013 and UM Language Packs are now available on the Microsoft Download Center. Cumulative Update 9 contains the latest set of fixes and builds upon Exchange Server 2013 Cumulative Update 8. The release includes fixes for customer reported issues, minor product enhancements and previously released security bulletins. A complete list of customer reported issues resolved can be found in Knowledge Base Article KB3049849. Customers running any previous release of Exchange Server 2013 can move directly to Cumulative Update 9 today. Customers deploying Exchange Server 2013 for the first time may skip previous releases and start their deployment with Cumulative Update 9 directly.