Neon Responder 5.4 for LANsurveyor allows remote attackers to cause a denial of service (application outage) via a crafted Clock Synchronisation packet that triggers an access violation.
https://exchange.xforce.ibmcloud.com/vulnerabilities/25904
http://www.vupen.com/english/advisories/2006/1442
http://www.securityfocus.com/archive/1/431157/100/0/threaded
http://securitytracker.com/id?1015950
http://securityreason.com/securityalert/776