What’s Vulnerable › Vulnerabilities

CVE-2021-43081

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.9% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2022-05-11 · updated 2026-06-17
• Weakness: CWE-79

Description

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 (FortiGate): from 6.0.0 through 6.0.14; from 6.2.0 through 6.2.10; from 6.4.0 before 6.4.9; from 7.0.0 before 7.0.4 — fixed in 6.4.9, 7.0.4
• Fortinet FortiProxy: from 2.0.0 before 2.0.8; from 7.0.0 before 7.0.2 — fixed in 2.0.8, 7.0.2

How to fix

Upgrade to a fixed version: Fortinet FortiOS (FortiGate) 6.4.9, 7.0.4; Fortinet FortiProxy 2.0.8, 7.0.2. Check the vendor advisory for mitigations.

References

• https://fortiguard.com/psirt/FG-IR-21-230
• https://fortiguard.com/psirt/FG-IR-21-230

Get alerted when CVE-2021-43081 or the next vulnerability affects your stack