In Wireshark 2.4.0 to 2.4.12 and 2.6.0 to 2.6.6, the RPCAP dissector could crash. This was addressed in epan/dissectors/packet-rpcap.c by avoiding an attempted dereference of a NULL conversation.
https://www.wireshark.org/security/wnpa-sec-2019-08.html
https://www.debian.org/security/2019/dsa-4416
https://usn.ubuntu.com/3986-1/
https://seclists.org/bugtraq/2019/Mar/35
https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=15536
http://www.securityfocus.com/bid/107203
http://lists.opensuse.org/opensuse-security-announce/2020-03/msg00027.html
http://lists.opensuse.org/opensuse-security-announce/2019-05/msg00027.html
http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00007.html