ISC DHCP is ISC's reference implementation of all aspects of the Dynamic Host Configuration Protocol.
A buffer overflow error was found in ISC DHCP server, that can only be exploited under unusual server configurations where the DHCP server is configured to provide clients with a large set of DHCP options.
A remote attacker could exploit this vulnerability to cause a Denial of Service.
There is no known workaround at this time.
All ISC DHCP users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose ">=net-misc/dhcp-3.1.1"