The IOS Shell in Cisco IOS allows local users to cause a denial of service (device crash) via unspecified commands, aka Bug ID CSCur59696.
https://exchange.xforce.ibmcloud.com/vulnerabilities/100810
http://www.securitytracker.com/id/1031717
http://www.securityfocus.com/bid/72550
http://tools.cisco.com/security/center/content/CiscoSecurityNotice/CVE-2015-0606