In Wireshark 3.0.x before 3.0.8, the BT ATT dissector could crash. This was addressed in epan/dissectors/packet-btatt.c by validating opcodes.
https://www.wireshark.org/security/wnpa-sec-2020-02.html
https://lists.debian.org/debian-lts-announce/2021/02/msg00008.html