CVE-2025-66600

HIGHNVD 8.8

8.8

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

This product lacks HSTS (HTTP Strict Transport Security) configuration. When an attacker performs a Man in the middle (MITM) attack, communications with the web server could be sniffed.

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

CVSS v3: 8.8
EG Score: 0.0(none)
EPSS: 20.5%
KEV: Not listed

Published

February 9, 2026

Last Modified

April 15, 2026

References (1)

7168b535-132a-4efe-a076-338f829b2eb9https://web-material3.yokogawa.com/1/39206/files/YSAR-26-0001-E.pdf

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-358Improperly Implemented Security Check for Standard

Data Freshness Timeline

(refreshed 16× in last 7d / 20× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

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2026-05-21 22:43 UTCepss_batch

Frequently asked(5)

What is CVE-2025-66600?

CVE-2025-66600 is a high vulnerability published on February 9, 2026. A vulnerability has been found in FAST/TOOLS provided by Yokogawa Electric Corporation. This product lacks HSTS (HTTP Strict Transport Security) configuration. When an attacker performs a Man in the middle (MITM) attack, communications with the web server could be sniffed. The affected products and…

When was CVE-2025-66600 disclosed?

CVE-2025-66600 was first published in the National Vulnerability Database on February 9, 2026, with the most recent update on April 15, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2025-66600 actively exploited?

CVE-2025-66600 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 20.5% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2025-66600?

CVE-2025-66600 has a CVSS v3 base score of 8.8 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 0.0.

How do I remediate CVE-2025-66600?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2025-66600, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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CVE-2025-66600

📅 Published

🔄 Last Modified

🔗 References (1)

Weakness Classification(1)

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2025-66600?

🔗 Related CVEs(same CWE)

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Published

Last Modified

References (1)

Frequently asked(5)

Related CVEs(same CWE)