[2.3] Vulnerability in dhcp < 4.2.5-P1 allows remote denial of service
This update replaces the included BIND 9 code that the DHCP programs
link against. Those contained a defect that could possibly lead to
excessive memory consumption and a denial of service.
(from redmine: issue id 1731, created on 2013-03-27, closed on 2013-04-11)