FortiOS 6.4.1 and <=6.2.9: XSS via Host Header in Web Filtering
CVE-2019-16151 Published on March 21, 2025
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 Analysis
CVE-2019-16151 can be exploited with network access, requires user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality, with no impact on integrity, and no impact on availability.
Weakness Type
What is a XSS Vulnerability?
The software does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.
CVE-2019-16151 has been classified to as a XSS vulnerability or weakness.
Products Associated with CVE-2019-16151
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Affected Versions
Fortinet FortiOS:- Version 6.4.0, <= 6.4.1 is affected.
- Version 6.2.0, <= 6.2.9 is affected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.