Several protocol parsers in tcpdump before 4.9.2 could cause a buffer overflow in util-print.c:bittok2str_internal().
https://support.apple.com/HT208221
https://security.gentoo.org/glsa/201709-23
https://github.com/the-tcpdump-group/tcpdump/commit/9f0730bee3eb65d07b49fd468bc2f269173352fe
https://access.redhat.com/errata/RHEA-2018:0705
http://www.tcpdump.org/tcpdump-changes.txt