In Wireshark 2.6.0, 2.4.0 to 2.4.6, and 2.2.0 to 2.2.14, the RRC dissector and other dissectors could crash. This was addressed in epan/proto.c by avoiding a NULL pointer dereference.
https://www.wireshark.org/security/wnpa-sec-2018-33.html
https://lists.debian.org/debian-lts-announce/2019/01/msg00010.html
https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=14703
http://www.securitytracker.com/id/1041036
http://www.securityfocus.com/bid/104308
http://lists.opensuse.org/opensuse-security-announce/2020-03/msg00027.html