tcpdump 4.9.0 has a heap-based buffer over-read in the pimv1_print function in print-pim.c.
https://access.redhat.com/errata/RHEA-2018:0705
https://github.com/hackerlib/hackerlib-vul/tree/master/tcpdump-vul/heap-buffer-overflow/print-pim
https://security.gentoo.org/glsa/201709-23
https://support.apple.com/HT208221