What is the CVSS score of CVE-2025-66608?

CVE-2025-66608 has a CVSS 3.1 base score of 7.5 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N. EPSS exploitation probability: 0.1%.

How to fix or mitigate CVE-2025-66608?

Within 24 hours: Inventory all FAST/TOOLS deployments and assess exposure in production environments; notify Yokogawa support for patch timeline and workarounds. Within 7 days: Implement network segmentation to restrict FAST/TOOLS access to trusted networks only and deploy WAF rules to block malformed URL requests to the application. Within 30 days: Establish continuous monitoring for exploitation attempts; coordinate with Yokogawa for patch deployment immediately upon release and schedule testing in non-production environments.

Fast Tools CVE-2025-66608

HIGH

Path Traversal: '\\..\\filename' (CWE-29)

2026-02-09 7168b535-132a-4efe-a076-338f829b2eb9

Information Disclosure Fast Tools Yokogawa

7.5

CVSS 3.1 · NVD

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Vulnerability Assessment

Weakness	CWE CWE-29 OWASP Top 10:2025 A01:2025 - Broken Access Control ASVS 5.0 V5 - File Handling Path traversal prevention
Impact	CVSS 7.5 (HIGH). Attack vector: Network. Complexity: Low. Privileges required: None. User interaction: None.
Exploit ScenarioDerived	An attacker could exploit this vulnerability to compromise the affected system.

This Week Schedule remediation this week. Why: HIGH severity (CVSS 7.0-8.9).

No patch listed yet 0.1% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 12, 2026

A vulnerability has been found in FAST/TOOLS provided by Yokogawa Electric Corporation. This product does not properly validate URLs. [CVSS 7.5 HIGH]

RemediationAI

Monitor vendor advisories for a patch. Restrict network access to the affected service where possible.

Affects your stack

Find out whether the stacks and servers you run are on an affected version.

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

Affects Fast\/Tools. A vulnerability has been found in FAST/TOOLS provided by Yokogawa Electric Corporation.

This product does not properly validate URLs. An attacker could send specially crafted requests to steal files from the web server.

The affected products and versions are as follows: FAST/TOOLS (Packages: RVSVRN, UNSVRN, HMIWEB, FTEES, HMIMOB) R9.01 to R10.04

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 7.5 HIGH

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

DescriptionCVE.org

A vulnerability has been found in FAST/TOOLS provided by Yokogawa Electric Corporation.

This product does not properly validate URLs. An attacker could send specially crafted requests to steal files from the web server.

The affected products and versions are as follows: FAST/TOOLS (Packages: RVSVRN, UNSVRN, HMIWEB, FTEES, HMIMOB) R9.01 to R10.04

Executive ViewAI

Why It Matters

CVE-2025-66608 affects Yokogawa FAST/TOOLS, a critical industrial control system platform, through improper URL validation that could enable attackers to bypass security controls or redirect users to malicious sites. Organizations using this product face immediate risk of unauthorized access or data exfiltration until remediation is applied, particularly concerning given the absence of an available patch.

Business Impact: High

Compensating Controls

Network segmentation to restrict access to FAST/TOOLS only from authorized subnets; Web Application Firewall (WAF) rules to block requests with malicious or malformed URLs; disable external URL processing features if not operationally critical; implement strict input validation at network boundary; enable detailed logging and monitoring of all FAST/TOOLS URL requests; restrict administrative access to the application; maintain offline backups of critical configurations.

Threat Intelligence Overview

EPSS Score

0.1%

Top 71% exploitable

Data Quality

3 sources

Confidence: Low

NVD

CVE.org

EPSS

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity HIGH

CISA KEV No

Public POC No

EPSS 0.1%

Patch available No

Active threat No

Deciding rule

HIGH severity (CVSS 7.0-8.9)

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived

Scheduled

Exploitation· derived

None

System Exposure· derived

Open

Automatable· derived

Yes

Human Impact

High

Priority Score

Low Medium High Critical

KEV: 0

EPSS: 0

CVSS: +38

PoC: 0

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Information Disclosure MEDIUM

Information disclosure occurs when an application unintentionally exposes sensitive data that aids attackers in reconnaissance or directly compromises security.