Buffer overflows in netstd 3.07-17 package allows remote DNS servers to execute arbitrary code via a long FQDN reply, as observed in the utilities (1) linux-ftpd, (2) pcnfsd, (3) tftp, (4) traceroute, or (5) from/to.
http://www.securityfocus.com/bid/4816
http://www.iss.net/security_center/static/9164.php