The U.S. Cybersecurity and Infrastructure Security Agency (CISA) issued an urgent warning to Fortinet customers following the disclosure of “FortiBleed,” a massive data leak exposing credentials associated with nearly 74,000 Fortinet firewalls and VPN gateways worldwide. The leaked dataset, discovered by security researcher Volodymyr “Bob” Diachenko, contains usernames, email addresses, plaintext passwords, and device URLs spanning over 21,000 domains across 194 countries, affecting organizations in government, critical infrastructure, telecommunications, healthcare, finance, and manufacturing, including major companies such as Samsung, Mercedes-Benz, Chevron, and AT&T. Threat intelligence firm Hudson Rock described the dataset as one of the largest known collections of compromised Fortinet credentials, while cybersecurity researcher Kevin Beaumont independently verified portions of the data and noted that most affected devices remain online. Diachenko attributed the operation to a Russian-speaking threat group that allegedly conducted more than 1.16 billion credential attempts against over 320,000 FortiGate targets to harvest SSL VPN authentication data, although the exact source of the leaked information remains unknown. In response, CISA urged organizations to immediately terminate active SSL VPN and administrative sessions, reset all associated passwords, enable phishing-resistant multi-factor authentication, restrict management interfaces from internet exposure, remove unauthorized accounts, and review logs for evidence of compromise or lateral movement. The warning comes amid broader concerns over Fortinet security, as CISA currently tracks twenty-six (26) Fortinet vulnerabilities known to have been exploited in the wild, including several leveraged in ransomware campaigns.