How severe is CVE-2025-66597?

CVE-2025-66597 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2025-66597 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (6th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-66597?

CVE-2025-66597 affects Yokogawa Fast/tools. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-66597?

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

Does CVE-2025-66597 have an EU (EUVD) identifier?

Yes. CVE-2025-66597 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-207176.

When was CVE-2025-66597 published?

CVE-2025-66597 was published on 2026-02-09 and last updated on 2026-06-17.

CVE-2025-66597

CVE-2025-66597 is a high-severity vulnerability in Yokogawa Fast/tools with a CVSS 3.x base score of 7.5. 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-327.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v4: 8.8
EPSS exploit prediction: 0% (6th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-207176
Weakness: CWE-327
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 supports weak cryptographic algorithms, potentially allowing an attacker to decrypt communications with the web server. 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-2025-66597?: A vulnerability has been found in FAST/TOOLS provided by Yokogawa Electric Corporation. This product supports weak cryptographic algorithms, potentially allowing an attacker to decrypt communications with the web server. 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-2025-66597?: CVE-2025-66597 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2025-66597 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (6th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-66597?: CVE-2025-66597 affects Yokogawa Fast/tools. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-66597?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2025-66597 have an EU (EUVD) identifier?: Yes. CVE-2025-66597 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-207176.
When was CVE-2025-66597 published?: CVE-2025-66597 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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