In Wireshark 2.2.0 to 2.2.7 and 2.0.0 to 2.0.13, the DOCSIS dissector could go into an infinite loop. This was addressed in plugins/docsis/packet-docsis.c by rejecting invalid Frame Control parameter values.
https://www.wireshark.org/security/wnpa-sec-2017-36.html
https://lists.debian.org/debian-lts-announce/2019/01/msg00010.html
https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=13797