CVE-2021-26102: Fortinet Fortiwan

Critical severity, CVSS 9.1. EPSS: 19.7% chance of exploitation in the next 30 days.

A relative path traversal vulnerability (CWE-23) in FortiWAN version 4.5.7 and below, 4.4 all versions may allow a remote non-authenticated attacker to delete files on the system by sending a crafted POST request. In particular, deleting specific configuration files will reset the Admin password to its default value.

Affected products

• Fortinet Fortiwan: from 4.4.0, before 4.5.8 (fixed in 4.5.8)

Published 2024-12-19. Last modified 2026-06-17.