SolarWinds TFTP Server 9.2.0.111 and earlier allows remote attackers to cause a denial of service (service stop) via a crafted Option Acknowledgement (OACK) request. NOTE: some of these details are obtained from third party information.
https://euvd.enisa.europa.eu/vulnerability/EUVD-2009-3098
http://www.securityfocus.com/bid/36182