daemon/worker.c in Unbound 1.x before 1.4.10, when debugging functionality and the interface-automatic option are enabled, allows remote attackers to cause a denial of service (assertion failure and daemon exit) via a crafted DNS request that triggers improper error handling.
https://exchange.xforce.ibmcloud.com/vulnerabilities/67645
http://www.securityfocus.com/bid/47986
http://www.kb.cert.org/vuls/id/531342
http://unbound.nlnetlabs.nl/downloads/CVE-2011-1922.txt
http://secunia.com/advisories/44865
http://lists.fedoraproject.org/pipermail/package-announce/2011-June/061243.html