common_startup.cc in PowerDNS (aka pdns) Authoritative Server before 2.9.22.5 and 3.x before 3.0.1 allows remote attackers to cause a denial of service (packet loop) via a crafted UDP DNS response.
https://euvd.enisa.europa.eu/vulnerability/EUVD-2012-0244
https://bugzilla.redhat.com/show_bug.cgi?id=772570