High severity · published Feb 9, 2026
CVE-2025-66600
A vulnerability has been found in FAST/TOOLS provided by Yokogawa Electric Corporation
8.8
CVSS
0.4%
EPSS
No
On KEV
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
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 29% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
FA
FAST/TOOLS · Yokogawa Electric Corporation
R9.01 through R10.04 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-66600
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-66600
web-material3.yokogawa.com
https://web-material3.yokogawa.com/1/39206/files/YSAR-26-0001-E.pdf
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