Fortinet has fixed a critical remote code execution zero-day vulnerability, CVE-2025-32756, actively exploited in attacks targeting FortiVoice enterprise phone systems.
The vulnerability affects FortiVoice, FortiMail, FortiNDR, FortiRecorder, and FortiCamera, allowing remote unauthenticated attackers to execute arbitrary code via malicious HTTP requests.
Threat actors exploiting the flaw scanned networks, erased crash logs, and deployed malware on compromised servers. They also added credential-stealing cron jobs and used scripts to scan victim networks.
Fortinet recommends disabling the HTTP/HTTPS administrative interface as a workaround. The attackers were identified using several IP addresses and enabling the 'fcgi debugging' setting on compromised systems.