How severe is CVE-2025-66599?

CVE-2025-66599 has a CVSS 4.0 base score of 6.9, rated medium severity.

Is CVE-2025-66599 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (17th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2025-66599?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2025-66599 have an EU (EUVD) identifier?

Yes. CVE-2025-66599 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-207174.

When was CVE-2025-66599 published?

CVE-2025-66599 was published on 2026-02-09 and last updated on 2026-06-17.

CVE-2025-66599

CVE-2025-66599 is a medium-severity vulnerability with a CVSS 4.0 base score of 6.9. 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-497.

Key facts

Severity: Medium (CVSS 4.0 base score 6.9)
EPSS exploit prediction: 0% (17th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-207174
Weakness: CWE-497
Published: 2026-02-09
Last modified: 2026-06-17

Description

A vulnerability has been found in FAST/TOOLS provided by Yokogawa Electric Corporation. Physical paths could be displayed on web pages. This information could be exploited by an attacker for other attacks. 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-2025-66599?: A vulnerability has been found in FAST/TOOLS provided by Yokogawa Electric Corporation. Physical paths could be displayed on web pages. This information could be exploited by an attacker for other attacks. 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-2025-66599?: CVE-2025-66599 has a CVSS 4.0 base score of 6.9, rated medium severity.
Is CVE-2025-66599 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (17th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2025-66599?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-66599 have an EU (EUVD) identifier?: Yes. CVE-2025-66599 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-207174.
When was CVE-2025-66599 published?: CVE-2025-66599 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

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