CVE-2018-9195: Fortinet FortiClient

Medium severity, CVSS 5.9. EPSS: 1.6% chance of exploitation in the next 30 days.

Use of a hardcoded cryptographic key in the FortiGuard services communication protocol may allow a Man in the middle with knowledge of the key to eavesdrop on and modify information (URL/SPAM services in FortiOS 5.6, and URL/SPAM/AV services in FortiOS 6.0.; URL rating in FortiClient) sent and received from Fortiguard severs by decrypting these messages. Affected products include FortiClient for Windows 6.0.6 and below, FortiOS 6.0.7 and below, FortiClient for Mac OS 6.2.1 and below.

Affected products

• Fortinet FortiClient: up to and including 6.0.6; up to and including 6.2.1
• Fortinet FortiOS: up to and including 6.0.6

Published 2019-11-21. Last modified 2026-06-17.