What is CVE-2023-40718?

CVE-2023-40718 is a high-severity vulnerability in Fortinet Fortios, classified under CWE-436. CVSS score: 7.5/10. Published 2023-10-10.

How severe is CVE-2023-40718?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Fortinet Fortios

CVE-2023-40718

A interpretation conflict in Fortinet IPS Engine versions 7.321, 7.166 and 6.158 allows attacker to evade IPS features via crafted TCP packets.

Published 2023-10-10 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.

EPSS exploit prediction

EPSS: 0.004 (33.6th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 34th percentile — 33.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000

Affected products

Fortinet Fortios
Fortinet Fortios Ips Engine
Fortinet Ips Engine — versions 7.321, 7.166, 6.158

Weakness classification (CWE)

CWE-436

References

fortiguard.com/psirt/FG-IR-23-090 (Vendor Advisory)

Frequently asked questions

What is CVE-2023-40718?: CVE-2023-40718 is a high-severity vulnerability in Fortinet Fortios, classified under CWE-436. CVSS score: 7.5/10. Published 2023-10-10.
How severe is CVE-2023-40718?: High severity. CVSS v3 base score is 7.5 out of 10.