ISC DHCP 4.1 before 4.1.1-P1 and 4.0 before 4.0.2-P1 allows remote attackers to cause a denial of service (server exit) via a zero-length client ID.
https://exchange.xforce.ibmcloud.com/vulnerabilities/59222
http://www.securitytracker.com/id?1024093
http://www.securityfocus.com/bid/40775
http://www.mandriva.com/security/advisories?name=MDVSA-2010:114
http://www.exploit-db.com/exploits/14185
http://secunia.com/advisories/40116
http://lists.fedoraproject.org/pipermail/package-announce/2010-June/042843.html