The remote host is missing an update to the system as announced in the referenced advisory FreeBSD-SA-04:12.jailroute.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-04:12.jailroute.asc

The jail(2) system call allows a system administrator to lock up a process and all its descendants inside a closed environment with very limited ability to affect the system outside that environment, even for processes with superuser privileges. It is an extension of, but far more stringent than, the traditional Unix chroot(2) system call. The FreeBSD kernel maintains internal routing tables for the purpose of determining which interface should be used to transmit packets. These routing tables can be manipulated by user processes running with superuser privileges by sending messages over a routing socket. A programming error resulting in a failure to verify that an attempt to manipulate routing tables originated from a non-jailed process.