epan/dissectors/packet-ncp2222.inc in the NDS dissector in Wireshark 1.12.x before 1.12.13 does not properly maintain a ptvc data structure, which allows remote attackers to cause a denial of service (NULL pointer dereference and application crash) via a crafted packet.
https://www.exploit-db.com/exploits/40194/
https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=12576
http://www.wireshark.org/security/wnpa-sec-2016-40.html
http://www.securitytracker.com/id/1036480
http://www.securityfocus.com/bid/92164