CVE-2021-3378: Fortilogger

Critical severity, CVSS 9.8. EPSS: 97.5% chance of exploitation in the next 30 days.

FortiLogger 4.4.2.2 is affected by Arbitrary File Upload by sending a "Content-Type: image/png" header to Config/SaveUploadedHotspotLogoFile and then visiting Assets/temp/hotspot/img/logohotspot.asp.

Affected products

• Fortilogger Fortilogger: before 5.2.0 (fixed in 5.2.0)

Published 2021-02-01. Last modified 2026-06-17.