What is CVE-2025-66178?

CVE-2025-66178 is a medium-severity vulnerability in Fortinet Fortiweb, classified under OS Command Injection. CVSS score: 6.7/10. Published 2026-03-10.

How severe is CVE-2025-66178?

Medium severity. CVSS v3 base score is 6.7 out of 10.

RCE in Fortinet Fortiweb

CVE-2025-66178

A improper neutralization of special elements used in an os command ('os command injection') vulnerability in Fortinet FortiWeb 8.0.0 through 8.0.1, FortiWeb 7.6.0 through 7.6.5, FortiWeb 7.4.0 through 7.4.11, FortiWeb 7.2.0 through 7.2.12…

Vulnerability class: Command Injection (OS Command Injection)

EPSS: 0.000 (11.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.7 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C.

Affected products

Fortinet Fortiweb — versions 8.0.0, 7.6.0, 7.4.0

Weakness classification (CWE)

CWE-78 — OS Command Injection

References

https://fortiguard.fortinet.com/psirt/FG-IR-26-088

Frequently asked questions

What is CVE-2025-66178?: CVE-2025-66178 is a medium-severity vulnerability in Fortinet Fortiweb, classified under OS Command Injection. CVSS score: 6.7/10. Published 2026-03-10.
How severe is CVE-2025-66178?: Medium severity. CVSS v3 base score is 6.7 out of 10.