ISC BIND 9.8.x before 9.8.4-P1 and 9.9.x before 9.9.2-P1, when DNS64 is enabled, allows remote attackers to cause a denial of service (assertion failure and daemon exit) via a crafted query.
https://kb.isc.org/article/AA-00828
http://www.ubuntu.com/usn/USN-1657-1
http://www.slackware.com/security/viewer.php?l=slackware-security&y=2012&m=slackware-security.536004
http://support.apple.com/kb/HT5880
http://rhn.redhat.com/errata/RHSA-2012-1549.html
http://lists.apple.com/archives/security-announce/2013/Sep/msg00002.html