CVE-2021-26112: Fortinet Fortiwan

Critical severity, CVSS 9.8. EPSS: 1.7% chance of exploitation in the next 30 days.

Multiple stack-based buffer overflow vulnerabilities [CWE-121] both in network daemons and in the command line interpreter of FortiWAN before 4.5.9 may allow an unauthenticated attacker to potentially corrupt control data in memory and execute arbitrary code via specifically crafted requests.

Affected products

• Fortinet Fortiwan: up to and including 4.5.8

Published 2022-04-06. Last modified 2026-06-17.