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Vulnerability record · CVE-2025-66598 · published 9 February 2026

CVE-2025-66598: Yokogawa fast\/tools broken cryptographic algorithm vulnerability

Yokogawa · Fast\/Tools

A vulnerability has been found in FAST/TOOLS provided by Yokogawa Electric Corporation. This product supports old SSL/TLS versions, 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

7.1 CVSS 4.0 High EPSS 0.16% · top 95.8% CWE-327 · Broken cryptographic algorithm
7.1CVSS 4.0 base score
0.16%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
1References
17 Jun 2026Last modified by NVD

Description

A vulnerability has been found in FAST/TOOLS provided by Yokogawa Electric Corporation. This product supports old SSL/TLS versions, 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:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://web-material3.yokogawa.com/1/39206/files/YSAR-26-0001-E.pdf Vendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2025-66598), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.