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Medium severity · published Feb 9, 2026
CVE-2025-66596
A vulnerability has been found in FAST/TOOLS provided by Yokogawa Electric Corporation
6.1
CVSS
0.2%
EPSS
No
On KEV
Description
A vulnerability has been found in FAST/TOOLS provided by Yokogawa Electric Corporation. This product does not properly validate request headers. When an attacker inserts an invalid host header, users could be redirected to malicious sites. 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:R/S:C/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 8% 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-2025-66596
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-66596
Vendor Advisory
https://web-material3.yokogawa.com/1/39206/files/YSAR-26-0001-E.pdf
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