High severity · published Feb 9, 2026
CVE-2025-66598
A vulnerability has been found in FAST/TOOLS provided by Yokogawa Electric Corporation
7.5
CVSS
0.2%
EPSS
No
On KEV
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
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 7% 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-2025-66598
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-66598
Vendor Advisory
https://web-material3.yokogawa.com/1/39206/files/YSAR-26-0001-E.pdf
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