Cisco Unified IP 9900 phones with firmware 9.4(.1) and earlier allow local users to cause a denial of service (device reload) via crafted commands, aka Bug ID CSCup92790.
https://exchange.xforce.ibmcloud.com/vulnerabilities/100617
http://www.securityfocus.com/bid/72483
http://tools.cisco.com/security/center/viewAlert.x?alertId=37344
http://tools.cisco.com/security/center/content/CiscoSecurityNotice/CVE-2015-0601