The IS-IS parser in tcpdump before 4.9.2 has a buffer over-read in print-isoclns.c:isis_print().Referenceshttps://security.gentoo.org/glsa/201709-23https://support.apple.com/HT208221http://www.debian.org/security/2017/dsa-3971http://www.securitytracker.com/id/1039307https://github.com/the-tcpdump-group/tcpdump/commit/3b32029db354cbc875127869d9b12a9addc75b50http://www.tcpdump.org/tcpdump-changes.txthttps://access.redhat.com/errata/RHEA-2018:0705
