Over 10,000 Fortinet Firewalls Still Exposed to 2FA Bypass Attack in 2026
In early January 2026, it was revealed that over 10,000 Fortinet FortiGate firewalls remain exposed to a critical authentication bypass vulnerability (CVE-2020-12812) first patched by Fortinet in July 2020. Attackers exploit this flaw by manipulating username case sensitivity to bypass two-factor authentication (2FA) on SSL VPNs—allowing unauthorized access to devices with unpatched software and certain LDAP configurations. Despite years of vendor and government warnings, more than 1,300 vulnerable systems in the United States alone are still online, placing organizations at ongoing risk of compromise. The persistence of this five-year-old flaw’s exploitation highlights chronic issues in vulnerability management and patch adoption within network infrastructure. Active targeting by both cybercriminal and state-backed actors, combined with evidence of ransomware deployment, underscores the need for continuous configuration hardening, zero trust adoption, and rapid remediation of exposed security controls.
Kill Chain
