CVE-2025-66598
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SSL/TLS Downgrade Vulnerability in Yokogawa FAST/TOOLS R9-R

Publication date: 2026-02-09

Last updated on: 2026-03-06

Assigner: YokogawaGroup

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

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Meta Information

Published
2026-02-09
Last Modified
2026-03-06
Generated
2026-07-06
AI Q&A
2026-02-09
EPSS Evaluated
2026-07-05
NVD
CVE-2025-66598
EUVD
EUVD-2025-207175

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
yokogawa fast/tools From r9.01 (inc) to r10.04 (inc)

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-327 The product uses a broken or risky cryptographic algorithm or protocol.

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Executive Summary

This vulnerability exists in the FAST/TOOLS product by Yokogawa Electric Corporation. The issue is that the product supports old SSL/TLS versions, which are outdated cryptographic protocols.

Because of this, an attacker could potentially decrypt communications between clients and the web server, compromising the confidentiality of the data transmitted.

Impact Analysis

The vulnerability can impact you by allowing attackers to intercept and decrypt sensitive communications with the web server.

This could lead to exposure of confidential information, unauthorized data access, and potential further exploitation of the system.

Compliance Impact

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