This cumulative update includes fixes for nonsecurity issues and all previously released fixes for security and nonsecurity issues.
Issues that this cumulative update fixes
This cumulative update fixes the issues that are described in the following Microsoft Knowledge Base articles:
4502131 “TLS negotiation failed with error UnknownCredentials” error after updating TLSCertificateName on Office 365 send connector in Exchange Server 2013 hybrid environment
4503028 Description of the security update for Microsoft Exchange Server 2013 and 2010: June 11, 2019