CVE-2025-66598 Weak cryptography in FAST/TOOLS
An attacker can decrypt communications with the web server due to support for old SSL/TLS versions in Yokogawa FAST/TOOLS.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-66598?
CVE-2025-66598 is a high-severity vulnerability in Yokogawa Electric Corporation FAST/TOOLS, published on 9 Feb 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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
Weakness: CWE-327
Which versions are affected by CVE-2025-66598?
It affects 1 product.
Products include Yokogawa Fast\/Tools.
How do I fix CVE-2025-66598?
No fix has been published for CVE-2025-66598 yet. Limit exposure of the affected software until one is available.
Is CVE-2025-66598 being exploited?
There is no known exploitation of CVE-2025-66598 in the wild and no public exploit code.
Other vulnerabilities in Yokogawa Electric Corporation FAST/TOOLS
Sources
Also known as GHSA-vwj8-79vf-v875.