CVE-2025-66602 Missing authorization in FAST/TOOLS

Medium 6.9 Published 9 Feb 2026 Updated 9 Feb 2026

The web server allows access via IP address without authentication, enabling worms to potentially attack the system.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2025-66602?

CVE-2025-66602 is a medium-severity missing authorization vulnerability in Yokogawa Electric Corporation FAST/TOOLS, published on 9 Feb 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

A vulnerability has been found in FAST/TOOLS provided by Yokogawa Electric Corporation.

The web server accepts access by IP address. When a worm that randomly searches for IP addresses intrudes into the network, it could potentially be attacked by the worm.

The affected products and versions are as follows: FAST/TOOLS (Packages: RVSVRN, UNSVRN, HMIWEB, FTEES, HMIMOB) R9.01 to R10.04

Weakness: CWE-291

Which versions are affected by CVE-2025-66602?

It affects 1 product.

Products include Yokogawa Fast\/Tools.

How do I fix CVE-2025-66602?

No fix has been published for CVE-2025-66602 yet. Limit exposure of the affected software until one is available.

Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.

Is CVE-2025-66602 being exploited?

There is no known exploitation of CVE-2025-66602 in the wild and no public exploit code.

Sources

Also known as GHSA-55cf-6jj6-233p.