CVE-2021-36193 Memory corruption in FortiADC

What is CVE-2021-36193?

CVE-2021-36193 is a medium-severity memory corruption vulnerability in Fortinet Fortiweb, published on 2 Feb 2022. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

Multiple stack-based buffer overflows in the command line interpreter of FortiWeb before 6.4.2 may allow an authenticated attacker to achieve arbitrary code execution via specially crafted commands.

Weakness: CWE-787, CWE-121

Which versions are affected by CVE-2021-36193?

It affects 1 product.

Products include Fortinet Fortiweb.

How do I fix CVE-2021-36193?

No fix has been published for CVE-2021-36193 yet. Limit exposure of the affected software until one is available.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2021-36193 being exploited?

There is no known exploitation of CVE-2021-36193 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-xfch-762x-q3v9.