What is CVE-2017-7734?

CVE-2017-7734 is a medium-severity vulnerability in Fortinet Fortios, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2017-09-12.

How severe is CVE-2017-7734?

Medium severity. CVSS v3 base score is 5.4 out of 10.

XSS in Fortinet Fortios

CVE-2017-7734

A Cross-Site Scripting vulnerability in Fortinet FortiOS versions 5.4.0 through 5.4.4 allows attackers to execute unauthorized code or commands via 'Comments' while saving Config Revisions.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2017-09-12 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.008 (54.4th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 54th percentile — 54.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: 0.000

Affected products

Fortinet Fortios — versions 5.4.0, 5.4.1, 5.4.2
Fortinet, Inc. Fortinet Fortios — versions FortiOS versions 5.4.0 through 5.4.4

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

www.securitytracker.com/id/1038705 (VDB Entry, Third Party Advisory, vdb-entry)
fortiguard.com/advisory/FG-IR-17-127 (Mitigation, Vendor Advisory)
www.securityfocus.com/bid/99098 (VDB Entry, Third Party Advisory, vdb-entry)

Frequently asked questions

What is CVE-2017-7734?: CVE-2017-7734 is a medium-severity vulnerability in Fortinet Fortios, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2017-09-12.
How severe is CVE-2017-7734?: Medium severity. CVSS v3 base score is 5.4 out of 10.