What is CVE-2018-13376?

CVE-2018-13376 is a high-severity vulnerability in Fortinet Fortios. CVSS score: 7.5/10. Published 2018-11-27.

How severe is CVE-2018-13376?

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

Vulnerability in Fortinet Fortios

CVE-2018-13376

An uninitialized memory buffer leak exists in Fortinet FortiOS 5.6.1 to 5.6.3, 5.4.6 to 5.4.7, 5.2 all versions under web proxy's disclaimer response web pages, potentially causing sensitive data to be displayed in the HTTP response.

Published 2018-11-27 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.021 (81.1th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 81st percentile — 81.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.021 · newest: 0.021 · change: 0.000

Affected products

Fortinet Fortios
Fortinet, Inc. Fortinet Fortios — versions FortiOS 5.6.1 to 5.6.3, 5.4.6 to 5.4.7, 5.2 all versions

References

www.securityfocus.com/bid/106036 (VDB Entry, Third Party Advisory, vdb-entry)
herolab.usd.de/wp-content/uploads/sites/4/2018/12/usd20180031.txt (Exploit, Third Party Advisory)
fortiguard.com/advisory/FG-IR-18-325 (Vendor Advisory)

Frequently asked questions

What is CVE-2018-13376?: CVE-2018-13376 is a high-severity vulnerability in Fortinet Fortios. CVSS score: 7.5/10. Published 2018-11-27.
How severe is CVE-2018-13376?: High severity. CVSS v3 base score is 7.5 out of 10.