CVE-2017-12897: Tcpdump

Critical severity, CVSS 9.8. EPSS: 2.5% chance of exploitation in the next 30 days.

The ISO CLNS parser in tcpdump before 4.9.2 has a buffer over-read in print-isoclns.c:isoclns_print().

Affected products

• Tcpdump Tcpdump: up to and including 4.9.1

Published 2017-09-14. Last modified 2026-06-17.