PowerDNS before 2.9.21.2 allows remote attackers to cause a denial of service (daemon crash) via a CH HINFO query.
doc.powerdns.com/powerdns-advisory-2008-03.html
lists.opensuse.org/opensuse-security-announce/2008-12/msg00002.html
secunia.com/advisories/32979
secunia.com/advisories/33264
security.gentoo.org/glsa/glsa-200812-19.xml
securitytracker.com/id?1021304
www.securityfocus.com/bid/32627
exchange.xforce.ibmcloud.com/vulnerabilities/47076