CVE-2021-22129: Fortinet FortiMail

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

Multiple instances of incorrect calculation of buffer size in the Webmail and Administrative interface of FortiMail before 6.4.5 may allow an authenticated attacker with regular webmail access to trigger a buffer overflow and to possibly execute unauthorized code or commands via specifically crafted HTTP requests.

Affected products

• Fortinet FortiMail: up to and including 5.4.12; from 5.6.1, before 6.0.11 (fixed in 6.0.11); from 6.2.0, before 6.2.7 (fixed in 6.2.7); from 6.4.0, before 6.4.5 (fixed in 6.4.5)

Published 2021-07-09. Last modified 2026-06-17.