In Wireshark 2.4.0 to 2.4.4 and 2.2.0 to 2.2.12, the FCP protocol dissector could crash. This was addressed in epan/dissectors/packet-fcp.c by checking for a NULL pointer.
https://www.wireshark.org/security/wnpa-sec-2018-09.html
https://lists.debian.org/debian-lts-announce/2019/01/msg00010.html
https://lists.debian.org/debian-lts-announce/2018/04/msg00018.html