The Grandstream BudgeTone 200 IP phone, with program 1.1.1.14 and bootloader 1.1.1.5, allows remote attackers to cause a denial of service (device crash) via SIP (1) INVITE, (2) CANCEL, or unspecified other messages with a WWW-Authenticate header containing a crafted Digest domain.
https://exchange.xforce.ibmcloud.com/vulnerabilities/33108
http://www.vupen.com/english/advisories/2007/1054
http://www.securitytracker.com/id?1017804
http://www.securityfocus.com/bid/23075
http://secunia.com/advisories/24538
http://lists.grok.org.uk/pipermail/full-disclosure/2007-March/053099.html