XFree86 Xserver Denial of Service Vulnerability
Solution submitted by Fred Silva <email@example.com>:
Run the X server with the option "-nolisten tcp" set. This option causes the X server to not listen connections from any client. To use this option, simply add it to serverargs variable in the /usr/X11/bin/startx script.
FreeBSD has released fixes for this vulnerability.
XFree86 X11R6 3.3.6