CVE-2021-43071 Memory corruption in Fortinet FortiWeb

What is CVE-2021-43071?

CVE-2021-43071 is a high-severity memory corruption vulnerability in Fortinet Fortiweb, published on 9 Dec 2021. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

A heap-based buffer overflow 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 requests to the LogReport API controller.

Weakness: CWE-787

Which versions are affected by CVE-2021-43071?

It affects 1 product.

Products include Fortinet Fortiweb.

How do I fix CVE-2021-43071?

No fix has been published for CVE-2021-43071 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-2021-43071 being exploited?

There is no known exploitation of CVE-2021-43071 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-23cq-6739-c6x5.