The HTTP server in Cisco Unified IP Phone 7935 and 7936 running SCCP firmware allows remote attackers to cause a denial of service (reboot) via a crafted HTTP request.
https://exchange.xforce.ibmcloud.com/vulnerabilities/40489
http://www.vupen.com/english/advisories/2008/0543
http://www.securitytracker.com/id?1019408
http://www.securityfocus.com/bid/27774
http://www.cisco.com/en/US/products/products_security_advisory09186a0080949c7a.shtml