CVE-2025-66600 Security feature bypass in FAST/TOOLS
Attackers can sniff web communications via MITM attacks due to missing HSTS configuration in Yokogawa FAST/TOOLS industrial software.
- 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-2025-66600?
CVE-2025-66600 is a high-severity 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.
This product lacks HSTS (HTTP Strict Transport Security) configuration. When an attacker performs a Man in the middle (MITM) attack, communications with the web server could be sniffed.
The affected products and versions are as follows: FAST/TOOLS (Packages: RVSVRN, UNSVRN, HMIWEB, FTEES, HMIMOB) R9.01 to R10.04
Weakness: CWE-358
Which versions are affected by CVE-2025-66600?
How do I fix CVE-2025-66600?
No fix has been published for CVE-2025-66600 yet. Limit exposure of the affected software until one is available.
Is CVE-2025-66600 being exploited?
There is no known exploitation of CVE-2025-66600 in the wild and no public exploit code.
Sources
Also known as GHSA-8582-9v9f-8xjx.