In Wireshark 2.4.0 to 2.4.4 and 2.2.0 to 2.2.12, epan/dissectors/packet-s7comm.c had an infinite loop that was addressed by correcting off-by-one errors.
https://www.wireshark.org/security/wnpa-sec-2018-06.html
https://euvd.enisa.europa.eu/vulnerability/EUVD-2018-19061