Fortinet has urgently notified customers of a crucial OS command injection vulnerability in its FortiSIEM platform, recognized as CVE-2025-25256, which is now being actively exploited within the wild. In line with Fortinet’s safety advisory, the flaw obtained a CVSS rating of 9.8, indicating its excessive severity.
What’s at Danger and Which Variations Are Affected?
This vulnerability stems from improper sanitization of particular components used inside working system instructions (categorised underneath CWE-78). Because of this, unauthenticated risk actors can remotely execute arbitrary code or instructions by means of crafted CLI requests—with none consumer interplay.
The affected FortiSIEM variations embrace:
- 6.1 by means of 6.6
- 6.7.0 to six.7.9 (improve to six.7.10+)
- 7.0.0 to 7.0.3 (improve to 7.0.4+)
- 7.1.0 to 7.1.7 (improve to 7.1.8+)
- 7.2.0 to 7.2.5 (improve to 7.2.6+)
- 7.3.0 to 7.3.1 (improve to 7.3.2+)
- 7.4 will not be affected
What Fortinet Recommends for FortiSIEM Bug
Fortinet urges fast motion — both patch to a hard and fast model or limit entry to the phMonitor port (TCP 7900), which is usually used for inside discovery and synchronization. Limiting entry to this port to trusted inside hosts or IPs could mitigate risk quickly.
Fortinet additionally confirmed that working exploit code is circulating within the wild. Sadly, these exploits don’t generate distinctive indicators of compromise (IoCs), making detection difficult.
Brute-Power Assaults on Fortinet SSL VPNs
This advisory comes on the heels of GreyNoise’s discovery of a sudden surge in brute-force makes an attempt focusing on Fortinet SSL VPN units. On August 3, 2025, greater than 780 distinctive IP addresses—from nations together with the US, Canada, Russia, and the Netherlands—tried unauthorized entry to VPN endpoints on quite a few continents.
GreyNoise additional noticed that this brute-force tooling shifted focus round August 5, transitioning from FortiOS-targeted assaults to hitting FortiManager (FGFM) programs as a substitute—suggesting attackers could also be adapting their technique mid-operation.
This sample is in keeping with GreyNoise’s broader analysis displaying that spikes in brute-force exercise typically precede new CVE disclosures focusing on the identical vendor, sometimes inside a six-week interval.
CVE-2025-25256 Vulnerability Abstract
| Problem | Particulars |
|---|---|
| Vulnerability | CVE-2025-25256 – crucial OS command injection in FortiSIEM (CVSS 9.8) |
| Exploit Standing | Actively exploited; lacks clear IoCs |
| Affected Variations | FortiSIEM 6.1–7.3.1 (besides 7.4) |
| Beneficial Motion | Patch to newest fastened model; limit entry to phMonitor port (7900) |
| Associated Assault Developments | Giant-scale brute-force assaults on SSL VPN and shifts towards FortiManager |
| Strategic Perception | Brute-force spikes are sometimes a precursor to new vulnerability disclosures |
Organizations working FortiSIEM should prioritize fast patching. If updates can’t be utilized immediately, tightening entry to crucial inside ports like 7900 (phMonitor) can function a short lived buffer. In the meantime, the latest wave of brute-force assaults in opposition to Fortinet units—particularly the shift towards FortiManager—indicators a broader, coordinated effort that intensifies the urgency.
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