CVE-2007-0431
AVM Fritz!Box 7050, and possibly other product models, allows remote attackers to cause a denial of service (VoIP application crash) via a zero-length UDP packet to the SIP port (port 5060).
Date published : 2007-01-22
http://www.securityfocus.com/bid/22130
http://www.securityfocus.com/archive/1/457406/100/0/threaded