CVE-2021-43081: Fortinet FortiOS

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

An improper neutralization of input during web page generation vulnerability [CWE-79] in FortiOS version 7.0.3 and below, 6.4.8 and below, 6.2.10 and below, 6.0.14 to 6.0.0. and in FortiProxy version 7.0.1 and below, 2.0.7 to 2.0.0 web filter override form may allow an unauthenticated attacker to perform an XSS attack via crafted HTTP GET requests.

Affected products

• Fortinet FortiOS: from 6.0.0, up to and including 6.0.14; from 6.2.0, up to and including 6.2.10; from 6.4.0, before 6.4.9 (fixed in 6.4.9); from 7.0.0, before 7.0.4 (fixed in 7.0.4)
• Fortinet FortiProxy: from 2.0.0, before 2.0.8 (fixed in 2.0.8); from 7.0.0, before 7.0.2 (fixed in 7.0.2)

Published 2022-05-11. Last modified 2026-06-17.