Unauthenticated OS Command Injection in Fortinet FortiSIEM phMonitor
CVE-2025-25256 is a critical OS command injection vulnerability in Fortinet FortiSIEM. According to the provided content, the flaw affects FortiSIEM 7.3.0 through 7.3.1, 7.2.0 through 7.2.5, 7.1.0 through 7.1.7, 7.0.0 through 7.0.3, and versions before 6.7.9, with broader reporting also indicating exposure across older 6.x branches. Fortinet describes the issue as improper neutralization of special elements used in an OS command, allowing an unauthenticated attacker to execute unauthorized code or commands via crafted CLI requests. Multiple supporting items tie exploitation to the phMonitor service, which is exposed on TCP port 7900 and processes inter-role FortiSIEM messages. The vulnerability enables remote command execution without authentication against vulnerable on-premises FortiSIEM deployments.
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Impact, mitigation & remediation
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Impact
What an attacker gets, and what they’ve been doing with it.
Mitigation
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Remediation
Patch, then assume compromise.
Exploits
No valid public exploits. Mallory filtered out 1 candidate as fakes, detection scripts, or README-only repos.
All candidate exploits were filtered out by Mallory's validation.
Affected products & vendors
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
Recent activity
123 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A previously fixed FortiSIEM vulnerability referenced as having practical exploit code observed in the wild (details not provided in the content).
Command injection vulnerability in Fortinet FortiSIEM.
A critical Fortinet FortiSIEM vulnerability enabling remote, unauthenticated OS command/code execution via crafted TCP requests to exposed phMonitor command handlers, chaining arbitrary write (with admin permissions) and privilege escalation to root.
An OS command injection flaw in Fortinet FortiSIEM enabling unauthenticated remote code execution via crafted CLI requests.
The version that knows your environment.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.