A zero-day vulnerability in Fortinet firewalls is being actively exploited by attackers. The flaw allows attackers to compromise systems with exposed interfaces. There is a mass exploitation campaign against Fortinet firewalls that peaked in December 2024. Fortinet has released a patch (CVE-2024-55591). It is suspected that the attackers may have been exploiting a zero-day vulnerability before the patch was released. Organizations using Fortinet firewalls are strongly advised to apply the patch as soon as possible.
A new hacking group has leaked configuration files and VPN credentials for over 15,000 FortiGate devices. This includes full configuration dumps and VPN passwords, exposing sensitive technical information to other cybercriminals. The affected devices appear to be primarily Fortigate 7.x and 7.2.x devices. The data was likely collected using a zero day exploit in 2022 but just released in Jan 2025.