The IS-IS parser in tcpdump before 4.9.2 has a buffer over-read in print-isoclns.c:isis_print().
http://www.debian.org/security/2017/dsa-3971
http://www.securitytracker.com/id/1039307
http://www.tcpdump.org/tcpdump-changes.txt
https://access.redhat.com/errata/RHEA-2018:0705
https://github.com/the-tcpdump-group/tcpdump/commit/3b32029db354cbc875127869d9b12a9addc75b50
Source: MITRE
Published: 2017-09-14
Updated: 2019-10-03
Type: CWE-125
Base Score: 7.5
Vector: AV:N/AC:L/Au:N/C:P/I:P/A:P
Impact Score: 6.4
Exploitability Score: 10
Severity: HIGH
Base Score: 9.8
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Impact Score: 5.9
Exploitability Score: 3.9
Severity: CRITICAL