FortiBleed Exposes 73,000+ Fortinet Devices: What Businesses Need to Know

Christopher Souza | CEO

It has been an unfortunate month for Fortinet customers. Not even a month after concerns emerged around attacks targeting Fortinet Endpoint Management Server (EMS), security researchers now uncovered another major security issue involving Fortinet infrastructure.

This latest incident, known as FortiBleed, involves the exposure of VPN credentials, firewall configuration data, and other sensitive information associated with Fortinet devices. While Fortinet has stated that the exposed information does not appear to stem from a newly discovered vulnerability, the scale of the leak has raised significant concerns across the cybersecurity community.

What Is FortiBleed?

Security researchers discovered a large dataset containing information associated with 73,932 Fortinet firewall and VPN devices across more than 21,000 organizations. They analyzed the data found exposed VPN credentials, usernames, passwords, configuration exports, and other information that could potentially be used to gain access to corporate networks.

According to analysis published by Hudson Rock, the dataset appears to be linked to a large-scale credential harvesting operation that targeted Fortinet devices around the world. The exposed information is one of the largest collections of Fortinet-related credential leaks known to date.

Was This a New Fortinet Breach?

At this time, there is no evidence that Fortinet itself suffered a new breach that directly resulted in the exposed dataset.

Fortinet has indicated that much of the information appears to originate from previously compromised systems, older credential theft campaigns, and historical vulnerabilities that had already been disclosed and patched. Some of the exposed data may have been collected over time through a combination of credential theft, compromised endpoints, misconfigured devices, and exploitation of known vulnerabilities that were not remediated promptly.

What remains unclear is how some of the configuration files and device data were obtained. Because investigators have not fully confirmed the source of all exposed information, organizations should avoid assuming they are unaffected simply because they have recently updated firmware.

Why This Matters

Firewalls and VPN gateways often serve as the front door to an organization’s network. If your front door is weak, the entire house is at risk. When credentials or configuration data become exposed, attackers gain valuable information that can help them identify weaknesses, bypass security controls, or launch additional attacks.

This is one reason security professionals often view configuration data as nearly as sensitive as passwords themselves.

The Risks Organizations Face

The organizations most at risk may be those that have not revisited their Fortinet security posture since earlier vulnerability disclosures.

Potential concerns include:

• VPN credentials that have remained unchanged for extended periods
• Administrative accounts without multi-factor authentication
• Legacy configurations that were never reviewed after previous security advisories
• Internet-facing management interfaces that are unnecessarily exposed
• Users reusing passwords across multiple systems

That means organizations that regularly rotate passwords and enforce strong authentication controls may already be in a significantly better position than those that have not.

Recommended Actions

TSI advises organizations using Fortinet firewalls or VPN services to consider taking the following steps as a precaution:

• Review and Rotate Credentials: Administrative accounts and VPN credentials should be reviewed and changed immediately.
• Verify Multi-Factor Authentication: Multi-factor authentication remains one of the most effective protections against credential-based attacks. Any externally accessible administrative portal or VPN service should require MFA whenever possible.
• Audit Device Configurations: Review firewall and VPN configurations for unnecessary exposure, outdated settings, or changes that may have occurred over time.
• Confirm Firmware Is Current: Verify that all Fortinet devices are running supported and fully patched versions.
• Review Access Logs: Monitoring VPN and firewall logs can help identify unusual authentication attempts, unexpected geographic access patterns, or suspicious administrative activity.
• Limit Administrative Exposure: Management interfaces should only be accessible from trusted networks. Publicly exposed administrative portals increase risk and should be evaluated.

One of the biggest takeaways from the FortiBleed incident is that cybersecurity is a continuous process that doesn’t rely solely about applying patches. Organizations must always consider credential hygiene, configuration management, access controls, and ongoing monitoring.

Many of the organizations represented in the leaked dataset may have applied security updates years ago, yet still find themselves exposed because credentials were never rotated or legacy configurations remained in place. Security requires continuous attention across people, processes, and technology.

TSI Can Help! Contact Us Today

TSI is actively monitoring developments related to FortiBleed and reviewing new information as it becomes available. While researchers continue to investigate the source and scope of the exposed data, organizations should take this opportunity to validate their Fortinet security posture and address any gaps that may exist.

If your organization uses Fortinet firewalls, FortiGate VPN services, or other Fortinet security products, our team can assist with configuration reviews, credential audits, firmware validation, security assessments, and best-practice recommendations. Contact TSI today to discuss your environment and ensure your organization remains protected as this situation escalates.

About Technical Support International

TSI is 37-year old cybersecurity (MSSP) and IT support (MSP) company specializing in helping DIB organizations address their NIST 800-171 and CMMC compliance obligations. As a CMMC-AB Registered Provider Organization (RPO), TSI offers a complete NIST 800-171 and CMMC support solution to help guide our clients toward a successful certification audit and provide the assurance that they’re adhering to these expansive compliance requirements.