What is CVE-2025-66597?

CVE-2025-66597 is a high-severity vulnerability in Yokogawa Fast\/tools, classified under Use of a Broken or Risky Cryptographic Algorithm. CVSS score: 7.5/10. Published 2026-02-09.

How severe is CVE-2025-66597?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Yokogawa Fast\/tools

CVE-2025-66597

A vulnerability has been found in FAST/TOOLS provided by Yokogawa Electric Corporation. This product supports weak cryptographic algorithms, potentially allowing an attacker to decrypt communications with the web server. The affected products and versions are as follows: FAST/TOOLS (Packages: RVSVRN, UNSVRN, HMIWEB, FTEES, HMIMOB) R9.01 to R10.04

Vulnerability class: POODLE (CVE-2014-3566)

EPSS: 0.002 (6.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

Affected products

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

Weakness classification (CWE)

CWE-327 — Use of a Broken or Risky Cryptographic Algorithm

References

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

Frequently asked questions

What is CVE-2025-66597?: CVE-2025-66597 is a high-severity vulnerability in Yokogawa Fast\/tools, classified under Use of a Broken or Risky Cryptographic Algorithm. CVSS score: 7.5/10. Published 2026-02-09.
How severe is CVE-2025-66597?: High severity. CVSS v3 base score is 7.5 out of 10.