According to an alert from Cisco, three vulnerabilities have been discovered in Cisco SN 5420 Storage Router software releases up to and including 1.1(5). Two of the vulnerabilities can cause a denial-of-service attack. The other allows access to the SN 5420 configuration if it has been previously saved on the router. There is no workaround for these vulnerabilities.
For more, go to: http://www.cisco.com/warp/public/707/SN-multiple-pub.shtml