Several protocol parsers in tcpdump before 4.9.2 could cause a buffer over-read in util-print.c:tok2strbuf().
https://support.apple.com/HT208221
https://security.gentoo.org/glsa/201709-23
https://github.com/the-tcpdump-group/tcpdump/commit/0318fa8b61bd6c837641129d585f1a73c652b1e0
https://access.redhat.com/errata/RHEA-2018:0705
http://www.tcpdump.org/tcpdump-changes.txt