CVE-2025-66605 – A vulnerability in Yokogawa's FAST/TOOLS softwa... (How to Fix)

Q: What is the severity of CVE-2025-66605?

CVE-2025-66605 has a CVSS score of 5.3 (MEDIUM). A vulnerability in Yokogawa's FAST/TOOLS software allows browser autocomplete to save sensitive input data from web interfaces. This affects industrial control system operators using FAST/TOOLS packages RVSVRN, UNSVRN, HMIWEB, FTEES, and HMIMOB from versions R9.01 to R10.04.

📋 TL;DR

A vulnerability in Yokogawa's FAST/TOOLS software allows browser autocomplete to save sensitive input data from web interfaces. This affects industrial control system operators using FAST/TOOLS packages RVSVRN, UNSVRN, HMIWEB, FTEES, and HMIMOB from versions R9.01 to R10.04.

💻 Affected Systems

Products:

FAST/TOOLS RVSVRN
FAST/TOOLS UNSVRN
FAST/TOOLS HMIWEB
FAST/TOOLS FTEES
FAST/TOOLS HMIMOB

Versions: R9.01 to R10.04

Operating Systems: Not specified in CVE

Default Config Vulnerable: ⚠️ Yes

Notes: Affects web interfaces and mobile interfaces where autocomplete is enabled on input fields.

📦 What is this software?

Fast\/tools by Yokogawa

View all CVEs affecting Fast\/tools →

⚠️ Risk & Real-World Impact

🔴

Worst Case

Sensitive operational data (credentials, configuration parameters, control commands) could be persistently stored in browsers and potentially accessed by unauthorized users on shared or compromised systems.

🟠

Likely Case

Operational data leakage through browser autocomplete storage, potentially exposing sensitive industrial control information to subsequent users of the same browser/system.

🟢

If Mitigated

Limited exposure if browsers are properly secured, autocomplete is disabled, and systems are not shared between users.

🌐 Internet-Facing: MEDIUM - Web interfaces exposed to internet could allow data capture if accessed through vulnerable browsers, but requires user interaction.

🏢 Internal Only: MEDIUM - Shared workstations in control rooms could expose sensitive operational data between users through browser autocomplete.

🎯 Exploit Status

Public PoC: ✅ No

Weaponized: UNKNOWN

Unauthenticated Exploit: ✅ No

Complexity: LOW

Exploitation requires user interaction with the web interface and relies on browser autocomplete behavior rather than direct code execution.

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: R10.04 with security update or later versions

Vendor Advisory: https://web-material3.yokogawa.com/1/39206/files/YSAR-26-0001-E.pdf

Restart Required: Yes

Instructions:

1. Apply Yokogawa security update for FAST/TOOLS. 2. Update to R10.04 or later. 3. Restart affected services. 4. Verify autocomplete attributes are properly disabled on sensitive input fields.

🔧 Temporary Workarounds

Browser Autocomplete Disable

all

Configure browsers to disable autocomplete for the FAST/TOOLS web interface

Browser-specific: Disable autocomplete in browser settings or use autocomplete='off' attribute injection via browser extensions

Input Field Protection

all

Manually add autocomplete='off' to sensitive input fields in web interface

Modify HTML forms to include autocomplete='off' attribute on sensitive input fields

🧯 If You Can't Patch

Implement strict browser usage policies prohibiting saving of form data
Use dedicated workstations for FAST/TOOLS access with browser data clearing after each session

🔍 How to Verify

Check if Vulnerable:

Inspect web interface input fields for missing autocomplete='off' attribute on sensitive data fields using browser developer tools

Check Version:

Check FAST/TOOLS version through system administration interface or vendor documentation

Verify Fix Applied:

Verify autocomplete='off' is present on all sensitive input fields in the web interface HTML

📡 Detection & Monitoring

Log Indicators:

Unusual browser autocomplete data storage patterns
Multiple user sessions accessing same sensitive data fields

Network Indicators:

HTTP traffic to FAST/TOOLS web interfaces with form submissions

SIEM Query:

Search for browser autocomplete data storage events related to FAST/TOOLS web interface URLs

📊 Metadata

CVE ID: CVE-2025-66605

CVSS v3 Score: 5.3 (MEDIUM)

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

CWE: CWE-359

EPSS Score: 0.04% exploit probability (12.6th percentile)

Published: February 9, 2026

Last Updated: March 5, 2026

🔗 References

https://web-material3.yokogawa.com/1/39206/files/YSAR-26-0001-E.pdf Vendor Advisory

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