What is CVE-2025-66603?

CVE-2025-66603 is a critical-severity vulnerability in Yokogawa Fast\/tools, classified under CWE-358. CVSS score: 9.8/10. Published 2026-02-09.

How severe is CVE-2025-66603?

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

Vulnerability in Yokogawa Fast\/tools

CVE-2025-66603

A vulnerability has been found in FAST/TOOLS provided by Yokogawa Electric Corporation. The web server accepts the OPTIONS method. An attacker could potentially use this information to carry out other attacks. The affected products a…

EPSS: 0.003 (17.3th 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.

Affected products

Yokogawa Fast\/tools
Yokogawa Electric Corporation Fast/tools — versions R9.01

Weakness classification (CWE)

CWE-358

References

7168b535-132a-4efe-a076-338f829b2eb9 (Vendor Advisory)

Frequently asked questions

What is CVE-2025-66603?: CVE-2025-66603 is a critical-severity vulnerability in Yokogawa Fast\/tools, classified under CWE-358. CVSS score: 9.8/10. Published 2026-02-09.
How severe is CVE-2025-66603?: Critical severity. CVSS v3 base score is 9.8 out of 10.