FileZilla Server before 0.9.22 allows remote attackers to cause a denial of service (crash) via a malformed argument to the STOR command, which results in a NULL pointer dereference. NOTE: CVE analysis suggests that the problem might be due to a malformed PORT command.
https://exchange.xforce.ibmcloud.com/vulnerabilities/30853
http://www.vupen.com/english/advisories/2006/4937
http://sourceforge.net/project/shownotes.php?release_id=470364&group_id=21558