CVE-2021-43063: Fortinet FortiWeb

Medium severity, CVSS 6.1. EPSS: 0.9% chance of exploitation in the next 30 days.

A improper neutralization of input during web page generation ('cross-site scripting') in Fortinet FortiWeb version 6.4.1 and 6.4.0, version 6.3.15 and below, version 6.2.6 and below allows attacker to execute unauthorized code or commands via crafted HTTP GET requests to the login webpage.

Affected products

• Fortinet FortiWeb: from 6.2.0, up to and including 6.2.6; from 6.3.0, up to and including 6.3.15; version 6.4.0 only; version 6.4.1 only

Published 2021-12-08. Last modified 2026-06-17.