In Wireshark 2.4.0 to 2.4.13, 2.6.0 to 2.6.7, and 3.0.0, the GSS-API dissector could crash. This was addressed in epan/dissectors/packet-gssapi.c by ensuring that a valid dissector is called.
lists.opensuse.org/opensuse-security-announce/2019-05/msg00022.html
lists.opensuse.org/opensuse-security-announce/2019-05/msg00027.html
lists.opensuse.org/opensuse-security-announce/2020-03/msg00027.html
www.securityfocus.com/bid/107834
bugs.wireshark.org/bugzilla/show_bug.cgi?id=15613
code.wireshark.org/review/gitweb?p=wireshark.git%3Ba=commit%3Bh=b20e5d8aae2580e29c83ddaf0b6b2e640603e4aa
lists.debian.org/debian-lts-announce/2019/05/msg00034.html
lists.debian.org/debian-lts-announce/2020/10/msg00036.html
lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4LYIOOQIMFQ3PA7AFBK4DNXHISTEYUC5/
lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PU3QA2DUO3XS24QE24CQRP4A4XQQY76R/
usn.ubuntu.com/3986-1/
www.wireshark.org/security/wnpa-sec-2019-14.html