Is CVE-2025-66602 in the CISA KEV catalog?

No. CVE-2025-66602 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2025-66602?

CVE-2025-66602 has a CVSS v3 base score of 9.8 (CRITICAL).

What is the EPSS score for CVE-2025-66602?

CVE-2025-66602 has an EPSS score of 0.30% (22th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix or mitigate CVE-2025-66602?

No published fix for CVE-2025-66602 has been found yet. Check the linked vendor advisories for guidance as it becomes available.

CVE & CISA-KEV Catalog

CVE-2025-66602

CRITICAL

9.8

CVSS v3

NVD

Description

A vulnerability has been found in FAST/TOOLS provided by Yokogawa Electric Corporation. The web server accepts access by IP address. When a worm that randomly searches for IP addresses intrudes into the network, it could potentially be attacked by the worm. The affected products and versions are as follows: FAST/TOOLS (Packages: RVSVRN, UNSVRN, HMIWEB, FTEES, HMIMOB) R9.01 to R10.04

CWE-291

How to fix

No published remediation has been found for this vulnerability's affected products yet.

Mitigation guidance may be in the linked vendor advisories in the References section below.

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CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Exploit Intelligence

0.30%probability of exploitation in 30 days

22ndpercentile

Low risk: more likely to be exploited than 22% of all known CVEs.

References

Vendor Advisory1

web-material3.yokogawa.com

Related Vulnerabilities

Other CWE-291 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2026-4252	Critical	9.8	1.3%	-	-
CVE-2023-7211	Medium	5.6	0.9%	-	-
CVE-2025-34202	High	8.8	0.9%	-	Fix
CVE-2024-23309	Critical	9.0	0.9%	-	-
CVE-2022-46415	Critical	9.1	0.9%	-	-
CVE-2026-3690	High	7.4	0.7%	-	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-03-05.