An unspecified "logical programming mistake" in SMART SynchronEyes Student and Teacher 6.0, and possibly earlier versions, allows remote attackers to cause a denial of service via a large packet to the Teacher discovery port (UDP port 5496), which causes a thread to terminate and prevents communications on that port.
https://exchange.xforce.ibmcloud.com/vulnerabilities/25659
http://www.vupen.com/english/advisories/2006/1241
http://www.securityfocus.com/archive/1/429843/100/0/threaded