Cisco IOS 11.x and 12.x allows remote attackers to cause a denial of service by sending the ENVIRON option to the Telnet daemon before it is ready to accept it, which causes the system to reboot.Referenceshttp://www.securityfocus.com/bid/1123http://www.osvdb.org/1289http://www.cisco.com/warp/public/707/iostelnetopt-pub.shtml
