CVE-2021-36190 Server-side request forgery in Fortinet FortiWeb

What is CVE-2021-36190?

CVE-2021-36190 is a medium-severity server-side request forgery vulnerability in Fortinet Fortiweb, published on 8 Dec 2021. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

A unintended proxy or intermediary ('confused deputy') in Fortinet FortiWeb version 6.4.1 and below, 6.3.15 and below allows an unauthenticated attacker to access protected hosts via crafted HTTP requests.

Which versions are affected by CVE-2021-36190?

It affects 1 product.

Products include Fortinet Fortiweb.

How do I fix CVE-2021-36190?

No fix has been published for CVE-2021-36190 yet. Limit exposure of the affected software until one is available.

Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.

Is CVE-2021-36190 being exploited?

There is no known exploitation of CVE-2021-36190 in the wild and no public exploit code.

Other vulnerabilities in Fortinet Fortiweb

• CVE-2025-25257 Fortinet FortiWeb SQL Injection Exploited Critical 9.6
• CVE-2025-64446 Fortinet FortiWeb Path Traversal Exploited Critical 9.4
• CVE-2025-58034 Fortinet FortiWeb OS Command Injection Exploited Medium 6.7
• CVE-2020-29015 SQL injection in Fortinet FortiWeb Critical 9.8
• CVE-2020-29016 Memory corruption in Fortinet FortiWeb Critical 9.8

All Fortinet Fortiweb vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-4662-9qvh-xxm7.