CVE-2021-43071: Fortinet FortiWeb

High severity, CVSS 8.8. EPSS: 1.3% chance of exploitation in the next 30 days.

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.

Affected products

• Fortinet FortiWeb: from 6.2.0, up to and including 6.2.6; from 6.3.0, up to and including 6.3.16; version 6.4.0 only; version 6.4.1 only

Published 2021-12-09. Last modified 2026-06-17.