Multiple signal handler race conditions in lukemftpd (aka tnftpd before 20040810) allow remote authenticated attackers to cause a denial of service or execute arbitrary code.
https://exchange.xforce.ibmcloud.com/vulnerabilities/17020
http://www.vuxml.org/freebsd/c4b025bb-f05d-11d8-9837-000c41e2cdad.html
http://www.debian.org/security/2004/dsa-551
http://lists.grok.org.uk/pipermail/full-disclosure/2004-August/025418.html