ISC BIND 9 Remote packet Denial of Service against Authoritative and Recursive Servers

http://www.isc.org/software/bind/advisories/cve-2011-2464

"A defect in the affected BIND 9 versions allows an attacker to remotely
cause the "named" process to exit using a specially crafted packet. This
defect affects both recursive and authoritative servers. The code
location of the defect makes it impossible to protect BIND using ACLs
configured within named.conf or by disabling any features at
compile-time or run-time."