In Wireshark before 2.2.12, the MRDISC dissector misuses a NULL pointer and crashes. This was addressed in epan/dissectors/packet-mrdisc.c by validating an IPv4 address. This vulnerability is similar to CVE-2017-9343.
https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=14299
https://code.wireshark.org/review/#/c/25063/
https://lists.debian.org/debian-lts-announce/2019/01/msg00010.html