CVE-2021-41030: Fortinet FortiClient Enterprise Management Server

Critical severity, CVSS 9.1. EPSS: 1% chance of exploitation in the next 30 days.

An authentication bypass by capture-replay vulnerability [CWE-294] in FortiClient EMS versions 7.0.1 and below and 6.4.4 and below may allow an unauthenticated attacker to impersonate an existing user by intercepting and re-using valid SAML authentication messages.

Affected products

• Fortinet FortiClient Enterprise Management Server: from 6.2.0, up to and including 6.2.9; from 6.4.0, up to and including 6.4.4; version 7.0.0 only; version 7.0.1 only

Published 2021-12-08. Last modified 2026-06-17.