What is CVE-2018-13366?

CVE-2018-13366 is a medium-severity vulnerability in Fortinet Fortios, classified under Information Disclosure. CVSS score: 5.3/10. Published 2019-04-09.

How severe is CVE-2018-13366?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Information disclosure in Fortinet Fortios

CVE-2018-13366

An information disclosure vulnerability in Fortinet FortiOS 6.0.1, 5.6.7 and below allows attacker to reveals serial number of FortiGate via hostname field defined in connection control setup packets of PPTP protocol.

Vulnerability class: Information Disclosure

Published 2019-04-09 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.

EPSS exploit prediction

EPSS: 0.009 (57.2th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 57th percentile — 57.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: 0.000

Affected products

Fortinet Fortios — versions 6.0.1, 5.6.7 and below
Fortinet Fortios — versions 6.0.0, 6.0.1

Weakness classification (CWE)

CWE-200 — Information Disclosure

References

fortiguard.com/advisory/FG-IR-18-101 (Vendor Advisory)

Frequently asked questions

What is CVE-2018-13366?: CVE-2018-13366 is a medium-severity vulnerability in Fortinet Fortios, classified under Information Disclosure. CVSS score: 5.3/10. Published 2019-04-09.
How severe is CVE-2018-13366?: Medium severity. CVSS v3 base score is 5.3 out of 10.