Unspecified vulnerability in Cisco PIX 500 Series Security Appliances allows remote attackers to send arbitrary UDP packets to intranet devices via unspecified vectors involving Session Initiation Protocol (SIP) fixup commands, a different issue than CVE-2006-4032. NOTE: the vendor, after working with the researcher, has been unable to reproduce the issue
http://www.securityfocus.com/bid/19536
http://www.networkworld.com/news/2006/080406-black-hat-unpatched-flaw-revealed.html?t5
http://searchsecurity.techtarget.com/originalContent/0%2C289142%2Csid14_gci1207450%2C00.html