The remote host is missing an update to bind announced via advisory DSA 026-1.

https://secure1.securityspace.com/smysecure/catid.html?in=DSA%20026-1

BIND 8 suffered from several buffer overflows. It is possible to construct an inverse query that allows the stack to be read remotely exposing environment variables. CERT has disclosed information about these issues. A new upstream version fixes this. Due to the complexity of BIND we have decided to make an exception to our rule by releasin the new upstream source to our stable distribution. We recommend you upgrade your bind packages immediately.