CVE-2021-41016: Fortinet Fortiextender Firmware

High severity, CVSS 8.8. EPSS: 1.1% chance of exploitation in the next 30 days.

A improper neutralization of special elements used in a command ('command injection') in Fortinet FortiExtender version 7.0.1 and below, 4.2.3 and below, 4.1.7 and below allows an authenticated attacker to execute privileged shell commands via CLI commands including special characters

Affected products

• Fortinet Fortiextender Firmware: from 4.1.1, before 4.1.8 (fixed in 4.1.8); from 4.2.0, before 4.2.4 (fixed in 4.2.4); from 7.0.0, before 7.0.2 (fixed in 7.0.2)

Published 2022-02-02. Last modified 2026-06-17.