The mirror mechanism in SurgeFTP 2.3a1 allows user-assisted, remote FTP servers to cause a denial of service (restart) via a malformed response to a PASV command.
lists.grok.org.uk/pipermail/full-disclosure/attachments/20070710/98374694/attachment-0030.txt
marc.info/?l=full-disclosure&m=118409539009277&w=2
osvdb.org/37909
secunia.com/advisories/26061
securityreason.com/securityalert/2883
www.vupen.com/english/advisories/2007/2528
exchange.xforce.ibmcloud.com/vulnerabilities/35376