Question 1

What is the EOL Risk Score for Fortinet FortiGate appliances (hardware) FortiGate-3815D-USG?

Accepted Answer

Fortinet FortiGate appliances (hardware) FortiGate-3815D-USG has an EOL Risk Score™ of 40 out of 100, placing it in the Medium risk band. The score is calculated from four factors: EOL Recency (30/40), Attack Surface (10/30), CISA KEV Exposure (0/20), and Extended Support Availability (0/10).

Question 2

Is Fortinet FortiGate appliances (hardware) FortiGate-3815D-USG still supported?

Accepted Answer

Fortinet FortiGate appliances (hardware) FortiGate-3815D-USG is no longer supported — it has passed its end of life date (January 14, 2026). No further security patches will be issued. Upgrade to a supported version or obtain extended lifecycle support.

Question 3

When does Fortinet FortiGate appliances (hardware) FortiGate-3815D-USG reach end of life?

Accepted Answer

Fortinet FortiGate appliances (hardware) FortiGate-3815D-USG reached (or will reach) end of life on January 14, 2026. After this date, no security patches or bug fixes are issued by the vendor.

Question 4

What are the security risks of running Fortinet FortiGate appliances (hardware) FortiGate-3815D-USG after end of life?

Accepted Answer

After end of life, Fortinet FortiGate appliances (hardware) FortiGate-3815D-USG no longer receives security patches. Any newly discovered CVEs remain unpatched indefinitely. Organizations running EOL software also face compliance violations under SOC 2, PCI DSS, HIPAA, and ISO 27001, which require use of supported software versions.