The dissect_ppi function in epan/dissectors/packet-ppi.c in the PPI dissector in Wireshark 2.0.x before 2.0.1 does not initialize a packet-header data structure, which allows remote attackers to cause a denial of service (application crash) via a crafted packet.
https://security.gentoo.org/glsa/201604-05
https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=11876