Buffer overflow in Domain Name Relay Daemon (DNRD) before 2.19.1 allows remote attackers to execute arbitrary code via a large number of large DNS packets with the Z and QR flags cleared.
https://euvd.enisa.europa.eu/vulnerability/EUVD-2005-2316
http://www.FreeBSD.org/ports/portaudit/e72fd82b-fa01-11d9-bc08-0001020eed82.html
http://sourceforge.net/forum/forum.php?forum_id=482568