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CVE-2025-25256 is a critical OS command injection vulnerability in Fortinet FortiSIEM. The flaw is caused by improper neutralization of special elements used in OS commands and is reachable through crafted CLI or TCP requests handled by the phMonitor service. The issue 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 additional reporting indicating older legacy branches are also affected. The vulnerability is pre-authentication, allowing a remote attacker to reach the vulnerable functionality without valid credentials or user interaction. Successful exploitation results in execution of unauthorized code or operating-system commands on the appliance.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
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.
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.
126 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A vulnerability tracked as CVE-2025-25256 for which a detection template was updated to use out-of-band DNS-based verification to confirm command execution and reduce false positives on non-FortiSIEM hosts.
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.
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.