Critical severity · published Feb 9, 2026
CVE-2025-66603
A vulnerability has been found in FAST/TOOLS provided by Yokogawa Electric Corporation
9.8
CVSS
0.3%
EPSS
No
On KEV
Description
A vulnerability has been found in FAST/TOOLS provided by Yokogawa Electric Corporation.
The web server accepts
the OPTIONS method. An attacker could potentially use this information to carry
out other attacks.
The
affected products and versions are as follows: FAST/TOOLS (Packages: RVSVRN, UNSVRN, HMIWEB, FTEES, HMIMOB) R9.01 to
R10.04
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 23% 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, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-66603
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-66603
Vendor Advisory
https://web-material3.yokogawa.com/1/39206/files/YSAR-26-0001-E.pdf
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