How severe is CVE-2025-66606?

CVE-2025-66606 has a CVSS 3.x base score of 9.6, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2025-66606 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (12th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-66606?

CVE-2025-66606 affects Yokogawa Fast/tools. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-66606?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2025-66606 have an EU (EUVD) identifier?

Yes. CVE-2025-66606 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-207165.

When was CVE-2025-66606 published?

CVE-2025-66606 was published on 2026-02-09 and last updated on 2026-06-17.

CVE-2025-66606

CVE-2025-66606 is a critical-severity vulnerability in Yokogawa Fast/tools with a CVSS 3.x base score of 9.6. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-86.

Key facts

Severity: Critical (CVSS 3.x base score 9.6)
CVSS v4: 2.1
EPSS exploit prediction: 0% (12th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-207165
Weakness: CWE-86
Affected product: Yokogawa Fast/tools
Published: 2026-02-09
Last modified: 2026-06-17

Description

A vulnerability has been found in FAST/TOOLS provided by Yokogawa Electric Corporation. This product does not properly encode URLs. An attacker could tamper with web pages or execute malicious scripts. The affected products and versions are as follows: FAST/TOOLS (Packages: RVSVRN, UNSVRN, HMIWEB, FTEES, HMIMOB) R9.01 to R10.04

Frequently asked questions

What is CVE-2025-66606?: A vulnerability has been found in FAST/TOOLS provided by Yokogawa Electric Corporation. This product does not properly encode URLs. An attacker could tamper with web pages or execute malicious scripts. The affected products and versions are as follows: FAST/TOOLS (Packages: RVSVRN, UNSVRN, HMIWEB, FTEES, HMIMOB) R9.01 to R10.04
How severe is CVE-2025-66606?: CVE-2025-66606 has a CVSS 3.x base score of 9.6, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2025-66606 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (12th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-66606?: CVE-2025-66606 affects Yokogawa Fast/tools. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-66606?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2025-66606 have an EU (EUVD) identifier?: Yes. CVE-2025-66606 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-207165.
When was CVE-2025-66606 published?: CVE-2025-66606 was published on 2026-02-09 and last updated on 2026-06-17.

References

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

Affected products (1)

cpe:2.3:a:yokogawa:fast\/tools:*:*:*:*:*:*:*:*

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