The web framework on Cisco Unified IP 9900 phones with firmware 9.4(.1) and earlier allows remote attackers to upload files to arbitrary locations on a phone's filesystem via crafted HTTP requests, aka Bug ID CSCup90424.
https://exchange.xforce.ibmcloud.com/vulnerabilities/100620
http://www.securityfocus.com/bid/72485
http://tools.cisco.com/security/center/viewAlert.x?alertId=37346
http://tools.cisco.com/security/center/content/CiscoSecurityNotice/CVE-2015-0604