What is CVE-2017-7733?

CVE-2017-7733 is a medium-severity vulnerability in Fortinet Fortios, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2017-10-27.

How severe is CVE-2017-7733?

Medium severity. CVSS v3 base score is 6.1 out of 10.

XSS in Fortinet Fortios

CVE-2017-7733

A Cross-Site-Scripting (XSS) vulnerability in Fortinet FortiOS 5.4.0 to 5.4.5 and 5.6.0 allows a remote unauthenticated attacker to execute arbitrary javascript code via webUI "Login Disclaimer" redir parameter.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2017-10-27 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.013 (68.9th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 69th percentile — 68.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.013 · newest: 0.013 · change: 0.000

Affected products

Fortinet Fortios — versions FortiOS 5.6.0, 5.4.5, 5.4.4, 5.4.3, 5.4.2, 5.4.1, 5.4.0
Fortinet Fortios — versions 5.4.0, 5.4.1, 5.4.2

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

www.securitytracker.com/id/1039677 (VDB Entry, Third Party Advisory, vdb-entry)
fortiguard.com/psirt/FG-IR-17-113 (Vendor Advisory)
www.securityfocus.com/bid/101563 (VDB Entry, Third Party Advisory, vdb-entry)

Frequently asked questions

What is CVE-2017-7733?: CVE-2017-7733 is a medium-severity vulnerability in Fortinet Fortios, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2017-10-27.
How severe is CVE-2017-7733?: Medium severity. CVSS v3 base score is 6.1 out of 10.