The remote host is missing an update to the system as announced in the referenced advisory FreeBSD-SA-04:15.syscons.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-04:15.syscons.asc

syscons(4) is the default console driver for FreeBSD. Using the physical keyboard and screen, it provides multiple virtual terminals which appear as if they were separate terminals. One virtual terminal is considered current and exclusively occupies the screen and the keyboard the other virtual terminals are placed in the background. The syscons CONS_SCRSHOT ioctl(2) does insufficient validation of its input arguments. In particular, negative coordinates or large coordinates may cause unexpected behavior.