CVE-2020-29016: Fortinet FortiWeb

Critical severity, CVSS 9.8. EPSS: 3.4% chance of exploitation in the next 30 days.

A stack-based buffer overflow vulnerability in FortiWeb 6.3.0 through 6.3.5 and version before 6.2.4 may allow an unauthenticated, remote attacker to overwrite the content of the stack and potentially execute arbitrary code by sending a crafted request with a large certname.

Affected products

• Fortinet FortiWeb: before 6.2.4 (fixed in 6.2.4); from 6.3.0, up to and including 6.3.5

Published 2021-01-14. Last modified 2026-06-17.