FortiBleed Targeted FortiGate Firewalls in 110 Million-Credential Harvesting Operation
A Russian-speaking initial access broker (IAB) driven by financial gain is assessed to be behind a large-scale credential-harvesting operation known as FortiBleed that has targeted over 430,000 FortiGate firewalls globally. The campaign , active since February 2026, involves collecting credential lists, searching for exposed services, brute-forcing accessible systems, and deploying bespoke sniffers on compromised firewalls. "Once deployed, these sniffers capture cleartext and hashed credentials from traffic passing through compromised devices," SOCRadar said [PDF] in a fresh report. "The actors then crack, validate, and reuse the credentials against Active Directory domains and other exposed services." Central to the operation is a Golang-based tool called FortigateSniffer that takes advantage of the FortiOS built-in diagnostic command -diagnose sniffer packet to passively capture authentication traffic from the infected appliances. The tool is designed to ...
ī Jun 23, 2026