Buffer overflow in EFTP allows remote attackers to cause a denial of service by sending a string that does not contain a newline, then disconnecting from the server.
https://exchange.xforce.ibmcloud.com/vulnerabilities/5220
https://euvd.enisa.europa.eu/vulnerability/EUVD-2000-0858
http://www.securityfocus.com/bid/1677
http://archives.neohapsis.com/archives/bugtraq/2000-09/0089.html