The remote host is missing an update to the system as announced in the referenced advisory.
The following packages are affected: isc-dhcp31-client isc-dhcp41-client
CVE-2011-0997 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, as demonstrated by a hostname that is provided to dhclient-script.
Solution: Update your system with the appropriate patches or software upgrades.