8.8

CVE-2025-66597: yokogawa electric corporation fast/tools

CVSS: 8.8v4.0HighAnalyzed
Published 09-02-2026Last modified 09-02-2026
Open JSON

Vulnerability summary

CVE-2025-66597 is a high (CVSS 8.8) vulnerability in yokogawa electric corporation fast/tools. EPSS estimates a 0.19% chance of exploitation in the next 30 days, higher than 8.4% of scored vulnerabilities.

Overall risk
35/100
0100
Medium · default modelHow is this calculated?
CVSS score
8.8/10
010
High · v4.0 (CVE.org)
EPSS score
0.19%
0%100%
Low · +0.02 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 09-02-2026
    PublishedVulnerability first disclosed.
  2. 09-02-2026
    Last modifiedVulnerability information updated.

Description

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

CVSS metrics

3 scores · 2 sources · 2 versions

EPSS trend

Probability

0.19%

Chance of exploitation in the next 30 days

Percentile

8%

Versus all other CVEs

30-day change

+0.02 pp

From 0.17% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.19%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Yokogawa1 product
Yokogawa electric corporation1 product

2 vendors · 2 products

References

1 links