The remote host has a web browser installed that is vulnerable to a remote code execution attack.
The remote host is running a version of Mozilla Firefox 3.6.x earlier than 3.6.3. Such versions are potentially affected by a memory corruption flaw caused by the re-use of a freed object when moving DOM nodes between documents. A remote attacker, exploiting this flaw, could execute arbitrary code on the remote host subject to the privileges of the user running the affected application.
Upgrade to Firefox 3.6.3 or later.