CVE-2025-66598 PUBLISHED

Assigner: YokogawaGroup
Reserved: 05.12.2025 Published: 09.02.2026 Updated: 09.02.2026

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 Vector: 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
CVSS Score: 7.1

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	High	Confidentiality	None
Attack Complexity	Low	Integrity	Low	Integrity	None
Attack Requirements	None	Availability	None	Availability	None
Privileges Required	Low
User Interaction	None

CVSS 4.0

Vendor	Yokogawa Electric Corporation
Product	FAST/TOOLS
Versions	Default: unknown affected from R9.01 to R10.04 (incl.)