In Wireshark 2.4.0 to 2.4.11, the ENIP dissector could crash. This was addressed in epan/dissectors/packet-enip.c by changing the memory-management approach so that a use-after-free is avoided.
https://www.wireshark.org/security/wnpa-sec-2019-05.html
https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=14470
http://lists.opensuse.org/opensuse-security-announce/2020-03/msg00027.html