What is CVE-2019-16151?

CVE-2019-16151 is a medium-severity vulnerability in Fortinet Fortios, classified under Cross-site Scripting. CVSS score: 4.7/10. Published 2025-03-21.

How severe is CVE-2019-16151?

Medium severity. CVSS v3 base score is 4.7 out of 10.

XSS in Fortinet Fortios

CVE-2019-16151

An improper neutralization of input during web page generation vulnerability [CWE-79] in FortiOS 6.4.1 and below, 6.2.9 and below may allow a remote unauthenticated attacker to either redirect users to malicious websites via a crafted "Host" header or to execute JavaScript code in the victim's browser context. This happens when the FortiGate has web filtering and category override enabled/configured.

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.004 (28.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 4.7 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N.

Affected products

Fortinet Fortios — versions 6.4.0, 6.2.0

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

psirt@fortinet.com (Vendor Advisory)

Frequently asked questions

What is CVE-2019-16151?: CVE-2019-16151 is a medium-severity vulnerability in Fortinet Fortios, classified under Cross-site Scripting. CVSS score: 4.7/10. Published 2025-03-21.
How severe is CVE-2019-16151?: Medium severity. CVSS v3 base score is 4.7 out of 10.