The default configuration of TLS in IBM Tivoli Directory Server (TDS) 6.3 and earlier supports the (1) NULL-MD5 and (2) NULL-SHA ciphers, which allows remote attackers to trigger unencrypted communication via the TLS Handshake Protocol.
https://exchange.xforce.ibmcloud.com/vulnerabilities/74303
http://www.securitytracker.com/id?1026939
http://www.securityfocus.com/bid/53043
http://www.ibm.com/support/docview.wss?uid=swg1IO16036
http://www.ibm.com/support/docview.wss?uid=swg1IO16035