CVE-2017-17543: Fortinet FortiClient

High severity, CVSS 7.5. EPSS: 0.4% chance of exploitation in the next 30 days.

Users' VPN authentication credentials are unsafely encrypted in Fortinet FortiClient for Windows 5.6.0 and below versions, FortiClient for Mac OSX 5.6.0 and below versions and FortiClient SSLVPN Client for Linux 4.4.2335 and below versions, due to the use of a static encryption key and weak encryption algorithms.

Affected products

• Fortinet FortiClient: up to and including 5.6.0
• Fortinet FortiClient SSLVPN Client: up to and including 4.4.2335

Published 2018-04-26. Last modified 2026-06-17.