What is CVE-2025-66602?

CVE-2025-66602 is a critical-severity vulnerability in Yokogawa Fast\/tools, classified under Reliance on IP Address for Authentication. CVSS score: 9.8/10. Published 2026-02-09.

How severe is CVE-2025-66602?

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

Vulnerability in Yokogawa Fast\/tools

CVE-2025-66602

A vulnerability has been found in FAST/TOOLS provided by Yokogawa Electric Corporation. The web server accepts access by IP address. When a worm that randomly searches for IP addresses intrudes into the network, it could potentially be…

EPSS: 0.003 (22.2th 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-291 — Reliance on IP Address for Authentication

References

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

Frequently asked questions

What is CVE-2025-66602?: CVE-2025-66602 is a critical-severity vulnerability in Yokogawa Fast\/tools, classified under Reliance on IP Address for Authentication. CVSS score: 9.8/10. Published 2026-02-09.
How severe is CVE-2025-66602?: Critical severity. CVSS v3 base score is 9.8 out of 10.