CVE-2009-2208
FreeBSD 6.3, 6.4, 7.1, and 7.2 does not enforce permissions on the SIOCSIFINFO_IN6 IOCTL, which allows local users to modify or disable IPv6 network interfaces, as demonstrated by modifying the MTU.
Date published : 2009-06-24
http://www.securityfocus.com/bid/35285
http://security.FreeBSD.org/advisories/FreeBSD-SA-09:10.ipv6.asc