CVE-2025-66602Network attack vector

Information disclosure via direct IP web access

Published Feb 9, 2026 · Updated Feb 9, 2026

Improper IP-based access control in Yokogawa FAST/TOOLS R9.01 through R10.04 allows remote attackers to obtain web content via direct IP requests. The FAST/TOOLS web server accepts requests addressed to its IP address rather than rejecting direct-address access, exposing it to address-scanning worms. No credentials or user interaction are required, but the server must be network-reachable; the vendor reports only limited confidentiality loss.

CVSS severity6.9
Medium
EPSS probability0.31%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper IP-based access control in Yokogawa FAST/TOOLS R9.01 through R10.04 allows remote attackers to obtain web content via direct IP requests. The FAST/TOOLS web server accepts requests addressed to its IP address rather than rejecting direct-address access, exposing it to address-scanning worms. No credentials or user interaction are required, but the server must be network-reachable; the vendor reports only limited confidentiality loss.

The record

CVE
CVE-2025-66602
Published
Feb 9, 2026
Updated
Feb 9, 2026
Vendor
Yokogawa Electric Corporation
Product
FAST/TOOLS
Classifications
CWE-291, CAPEC-4, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 9, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 9, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=R9.01 <=R10.04

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Yokogawa Electric Corporation · FAST/TOOLSversion=R9.01 <=R10.04

Published CVSS scores

9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
6.9Yokogawa Electric CorporationCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
5.3Yokogawa Electric CorporationCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-291Reliance on IP Address for Authentication
CAPEC-4Using Alternative IP Address Encodings
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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