diff -up dhcp-4.1-ESV-R2/client/dhclient.c.CVE-2011-0997 dhcp-4.1-ESV-R2/client/dhclient.c
--- dhcp-4.1-ESV-R2/client/dhclient.c.CVE-2011-0997	2011-04-06 20:44:17.000000000 +0200
+++ dhcp-4.1-ESV-R2/client/dhclient.c	2011-04-06 20:44:17.000000000 +0200
@@ -4348,11 +4348,11 @@ static int check_option_values(struct un
 	if ((universe == NULL) || (universe == &dhcp_universe)) {
 		switch(opt) {
 		      case DHO_HOST_NAME:
-		      case DHO_DOMAIN_NAME:
 		      case DHO_NIS_DOMAIN:
 		      case DHO_NETBIOS_SCOPE:
 			return check_domain_name(ptr, len, 0);
 			break;
+		      case DHO_DOMAIN_NAME: /* accept a list for compatibiliy */
 		      case DHO_DOMAIN_SEARCH:
 			return check_domain_name_list(ptr, len, 0);
 			break;