CVE-2023-33302: Fortinet FortiMail

High severity, CVSS 8.8. EPSS: 0.4% chance of exploitation in the next 30 days.

A buffer copy without checking size of input ('classic buffer overflow') in Fortinet FortiMail webmail and administrative interface version 6.4.0 through 6.4.4 and before 6.2.6 and FortiNDR administrative interface version 7.2.0 and before 7.1.0 allows 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: from 5.4.0, up to and including 5.4.12; from 6.0.0, 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)
• Fortinet Fortindr: from 1.1.0, before 7.2.1 (fixed in 7.2.1)

Published 2025-03-31. Last modified 2026-06-17.