What is CVE-2025-25256?

CVE-2025-25256 is a critical-severity vulnerability in Fortinet Fortisiem, classified under OS Command Injection. CVSS score: 9.8/10. Published 2025-08-12.

How severe is CVE-2025-25256?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Is CVE-2025-25256 known to be exploited?

11 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

RCE in Fortinet Fortisiem

CVE-2025-25256

An improper neutralization of special elements used in an OS command ('OS Command Injection') vulnerability [CWE-78] in Fortinet FortiSIEM version 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 befor…

Vulnerability class: Command Injection (OS Command Injection)

EPSS: 0.390 (97.4th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:H/RL:X/RC:C.

Affected products

Fortinet Fortisiem — versions 7.3.0, 7.2.0, 7.1.0

Weakness classification (CWE)

CWE-78 — OS Command Injection

Public proof-of-concept exploits

References

https://fortiguard.fortinet.com/psirt/FG-IR-25-152

Frequently asked questions

What is CVE-2025-25256?: CVE-2025-25256 is a critical-severity vulnerability in Fortinet Fortisiem, classified under OS Command Injection. CVSS score: 9.8/10. Published 2025-08-12.
How severe is CVE-2025-25256?: Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2025-25256 known to be exploited?: 11 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.