CISA Warns Fortinet Customers as FortiBleed Hits 86,644 FortiGate Devices

CISA urged Fortinet customers to secure FortiGate appliances against a Russian-speaking threat actor campaign called FortiBleed. The attack compromised 86,644 devices as of June 19, 2026, using default and built-in accounts. Telecom, government, and education sectors are most impacted, with exposures concentrated in India, the U.S., and Mexico.