In Wireshark 2.2.0 to 2.2.6 and 2.0.0 to 2.0.12, the DHCP dissector could read past the end of a buffer. This was addressed in epan/dissectors/packet-bootp.c by extracting the Vendor Class Identifier more carefully.
https://www.wireshark.org/security/wnpa-sec-2017-24.html
https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=13628
https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=13609
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=1183
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=1153