SMART SynchronEyes Student and Teacher 6.0, and possibly earlier versions, allows remote attackers to cause a denial of service (memory consumption) via a certain packet to the Teacher discovery port that causes SynchronEyes to connect to the attacker's machine and read a value that is used as a parameter to malloc.
https://exchange.xforce.ibmcloud.com/vulnerabilities/25663
http://www.vupen.com/english/advisories/2006/1241
http://www.securityfocus.com/archive/1/429843/100/0/threaded