CVE-2019-16411: Suricata-Ids Suricata

Critical severity, CVSS 9.8. EPSS: 2% chance of exploitation in the next 30 days.

An issue was discovered in Suricata 4.1.4. By sending multiple IPv4 packets that have invalid IPv4Options, the function IPV4OptValidateTimestamp in decode-ipv4.c tries to access a memory region that is not allocated. There is a check for o->len < 5 (corresponding to 2 bytes of header and 3 bytes of data). Then, "flag = *(o->data + 3)" places one beyond the 3 bytes, because the code should have been "flag = *(o->data + 1)" instead.

Affected products

• Suricata-Ids Suricata: version 4.1.4 only

Published 2019-09-24. Last modified 2026-06-17.