The remote host is missing an update to the system as announced in the referenced advisory FreeBSD-SA-05:09.htt.asc

Upgrade your system to the appropriate stable release or security branch dated after the correction date https://secure1.securityspace.com/smysecure/catid.html?in=FreeBSD-SA-05:09.htt.asc

Hyper-Threading Technology is the name used for the implementation of simultaneous multithreading on Intel Pentium 4, Mobile Pentium 4, and Xeon processors. A security flaw involving operating systems running on Hyper-Threading Technology processors was has been reported. Complete details are not available at the time of this writing. However, a workaround has been issued. It is expected that more details will be available tomorrow, at which time a revised version of this advisory will be published.