The BOOTP parser in tcpdump before 4.9.2 has a buffer over-read in print-bootp.c:bootp_print().
https://support.apple.com/HT208221
https://security.gentoo.org/glsa/201709-23
https://github.com/the-tcpdump-group/tcpdump/commit/66e22961b30547e9a8daa1f0e8dc9fbe6e2698fa
https://github.com/the-tcpdump-group/tcpdump/commit/29e5470e6ab84badbc31f4532bb7554a796d9d52
https://access.redhat.com/errata/RHEA-2018:0705
http://www.tcpdump.org/tcpdump-changes.txt