A vulnerability has been found and corrected in ISC DHCP: dhclient in ISC DHCP 3.0.x through 4.2.x before 4.2.1-P1, 3.1-ESV before 3.1-ESV-R1, and 4.1-ESV before 4.1-ESV-R2 allows remote attackers to execute arbitrary commands via shell metacharacters in a hostname obtained from a DHCP message . Additionally for Corporate Server 4 and Enterprise Server 5 ISC DHCP has been upgraded from the 3.0.7 version to the 4.1.2-P1 version which brings many enhancements such as better ipv6 support. Packages for 2009.0 are provided as of the Extended Maintenance Program