🔒 CVE-2025-64155: Critical FortiSIEM Vulnerability

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📌 Overview

CVE-2025-64155 is a critical security vulnerability in Fortinet FortiSIEM, a popular security information and event management platform. Publicly disclosed on January 13, 2026, it allows unauthenticated remote attackers to execute arbitrary system commands.

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⚠️ Vulnerability Details

• Type: OS Command Injection (CWE-78)
• Impact: Remote Code Execution (RCE) with root privileges
• Attack Vector: Network (TCP Port 7900)
• Privileges Required: None
• User Interaction: None
• Attack Complexity: Low
• Severity: CVSS 3.x 9.8 (Critical)

Description: An attacker can send specially crafted requests to FortiSIEM services (like phMonitor) to execute arbitrary commands, potentially compromising the entire system.

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🖥 Affected Products / Versions

• FortiSIEM 6.7.0 – 6.7.10
• FortiSIEM 7.0.0 – 7.0.4
• FortiSIEM 7.1.0 – 7.1.8
• FortiSIEM 7.2.0 – 7.2.6
• FortiSIEM 7.3.0 – 7.3.4
• FortiSIEM 7.4.0

Note: Cloud and latest patched versions (e.g., 7.4.1, 7.3.5, 7.2.7, 7.1.9) are not affected.

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🔥 Impact

• Unauthenticated remote exploitation possible

• Full system compromise (root access)

• Potential attacker actions:

  • Install malware/backdoors
  • Exfiltrate logs and credentials
  • Tamper or disable monitoring
  • Pivot to internal systems

FortiSIEM often contains sensitive telemetry and admin data, so compromise can seriously weaken organizational security.

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📈 Exploitation Status

• Public Proof-of-Concept (PoC) available
• Active exploitation reported in the wild
• Not yet listed in some official government vulnerability catalogs, but highly urgent

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🛡 Mitigation & Remediation

Immediate Actions:

1. Patch FortiSIEM immediately: upgrade to versions 7.4.1, 7.3.5, 7.2.7, or 7.1.9
2. Restrict network access: allow only trusted hosts to reach TCP port 7900
3. Segment & isolate FortiSIEM from general network exposure
4. Monitor logs: watch for unusual connections or unexpected admin actions

Temporary Workaround:

• Block inbound traffic to TCP port 7900 until patching is possible

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🧠 Summary

CVE-2025-64155 is a critical OS command injection vulnerability in FortiSIEM, enabling remote, unauthenticated root access. With PoC exploits publicly available, organizations must patch, isolate, and monitor immediately to prevent full system compromise.

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References:

• The Hacker Wire
• Socradar Threat Blog
• INCIBE