Multiple vulnerabilities has been discovered and corrected in dhcp:

The server in ISC DHCP 3.x and 4.x before 4.2.2, 3.1-ESV before
3.1-ESV-R3, and 4.1-ESV before 4.1-ESV-R3 allows remote attackers
to cause a denial of service (daemon exit) via a crafted DHCP packet
(CVE-2011-2748).

The server in ISC DHCP 3.x and 4.x before 4.2.2, 3.1-ESV before
3.1-ESV-R3, and 4.1-ESV before 4.1-ESV-R3 allows remote attackers to
cause a denial of service (daemon exit) via a crafted BOOTP packet
(CVE-2011-2749).

Packages for 2009.0 are provided as of the Extended Maintenance
Program. Please visit this link to learn more:
http://store.mandriva.com/product_info.php?cPath=149&products_id=490

The updated packages have been patched to correct these issues.