The DHCP daemon (DHCPD) for ISC DHCP 3.0.1rc12 and 3.0.1rc13, when compiled in environments that do not provide the vsnprintf function, uses C include files that define vsnprintf to use the less safe vsprintf function, which can lead to buffer overflow vulnerabilities that enable a denial of service (server crash) and possibly execute arbitrary code.
https://exchange.xforce.ibmcloud.com/vulnerabilities/16476
http://www.xerox.com/downloads/usa/en/c/cert_XRX06_004_v11.pdf
http://www.us-cert.gov/cas/techalerts/TA04-174A.html
http://www.securityfocus.com/bid/10591
http://www.novell.com/linux/security/advisories/2004_19_dhcp_server.html
http://www.mandriva.com/security/advisories?name=MDKSA-2004:061
http://www.kb.cert.org/vuls/id/654390
http://secunia.com/advisories/23265
http://marc.info/?l=bugtraq&m=108938625206063&w=2