na-img-4.0.34.bin for the IP3 Networks NetAccess NA75 allows local users to gain Unix shell access via "`" (backtick) characters in the appliance's command line interface (CLI).
https://exchange.xforce.ibmcloud.com/vulnerabilities/26108
http://www.vupen.com/english/advisories/2006/1540
http://www.securityfocus.com/bid/17698
http://www.securityfocus.com/archive/1/432007/100/0/threaded