According to an alert from Cisco, some Cisco Catalyst switches running certain CatOS-based software releases have a vulnerability wherein a buffer overflow in the Telnet option handling can cause the Telnet daemon to crash and result in a switch reload. This vulnerability can be exploited to initiate a denial-of-service attack. For more, go to:http://www.cisco.com/warp/public/707/catos-telrcv-vuln-pub.shtml
[]