This indicates an attempt to exploit a vulnerability in Apple Mac OS X.
Apple MAC OS X ships with the Bonjour system service, mDNSResponder, which listens on an ephemeral UDP port, by default. An overflow can be triggered by sending overly long data in the "Location:" header of a request to mDNSResponder. As a result, remote code execution as root may be possible.
Any version of MAC OS X.
Arbitrary code execution.
Currently, we are not aware of any officially supplied fix for this issue.