Vulnerability · Published Feb 9, 2026 · Assigned by YokogawaGroup
CVE-2025-66596
Medium 6.9
In plain English
A medium-severity open redirect in FAST/TOOLS from Yokogawa Electric Corporation. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 8% of all known vulnerabilities).
Official description
A vulnerability has been found in FAST/TOOLS provided by Yokogawa Electric Corporation. This product does not properly validate request headers. When an attacker inserts an invalid host header, users could be redirected to malicious sites. The affected products and versions are as follows: FAST/TOOLS (Packages: RVSVRN, UNSVRN, HMIWEB, FTEES, HMIMOB) R9.01 to R10.04
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Yokogawa Electric Corporation | FAST/TOOLS | R9.01 – through R10.04 |
Weakness: CWE-601 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N