CVE-2017-12997: Tcpdump

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

The LLDP parser in tcpdump before 4.9.2 could enter an infinite loop due to a bug in print-lldp.c:lldp_private_8021_print().

Affected products

• Tcpdump Tcpdump: up to and including 4.9.1

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