CVE-2024-55591: Fortinet FortiOS/FortiProxy Zero Day
In late November and December 2024, Arctic Wolf observed evidence of a mass compromise of Fortinet FortiGate. While the initial attack vector was unknown at the time, evidence of compromise (with new users and SSL profiles) was consistent across compromised devices. On January 14, Fortinet released a formal statement and patch. The vulnerability is an Authentication Bypass via crafted requests to Node.js websocket module and issued CVE-2024-55591. The CVSSv3 score is 9.6.