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Critical severity · published Feb 9, 2026
CVE-2025-66602
A vulnerability has been found in FAST/TOOLS provided by Yokogawa Electric Corporation
9.8
CVSS
0.4%
EPSS
No
On KEV
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
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)0.4% · higher than 28% 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
Affected product
FA
FAST/TOOLS
Yokogawa Electric Corporation
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-66602
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-66602
Vendor Advisory
https://web-material3.yokogawa.com/1/39206/files/YSAR-26-0001-E.pdf
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