CVE-2021-26090: Fortinet FortiMail

High severity, CVSS 7.5. EPSS: 1.3% chance of exploitation in the next 30 days.

A missing release of memory after its effective lifetime vulnerability in the Webmail of FortiMail 6.4.0 through 6.4.4 and 6.2.0 through 6.2.6 may allow an unauthenticated remote attacker to exhaust available memory via specifically crafted login requests.

Affected products

• Fortinet FortiMail: from 6.2.0, up to and including 6.2.6; from 6.4.0, before 6.4.5 (fixed in 6.4.5)

Published 2021-07-12. Last modified 2026-06-17.