Directory traversal vulnerability in WinAgents TFTP Server for Windows 3.1 and earlier allows remote attackers to read arbitrary files via "..." (triple dot) sequences in a GET request.
https://exchange.xforce.ibmcloud.com/vulnerabilities/25971
http://www.winagents.com/en/news/410.php
http://www.vupen.com/english/advisories/2006/1562