Is CVE-2025-39203 in the CISA KEV catalog?

No. CVE-2025-39203 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2025-39203?

CVE-2025-39203 has a CVSS v3 base score of 6.5 (MEDIUM).

What is the EPSS score for CVE-2025-39203?

CVE-2025-39203 has an EPSS score of 0.20% (10th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2025-39203?

Upgrade microscada x sys600 to 10.7 or later.

CVE & CISA-KEV Catalog

CVE-2025-39203

MEDIUM

6.5

CVSS v3

NVD

Description

A vulnerability exists in the IEC 61850 of the MicroSCADA X SYS600 product. An IEC 61850-8 crafted message content from IED or remote system can cause a denial of service resulting in disconnection loop.

CWE-354

How to fix

Remediation Available

microscada x sys600NVD

Affected:>= 10.5, < 10.7Fixed in:10.7CVE-2025-39203derived from NVD

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

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

Exploit Intelligence

0.20%probability of exploitation in 30 days

10thpercentile

Low risk: more likely to be exploited than 10% of all known CVEs.

References

Vendor Advisory1

publisher.hitachienergy.com

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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 2026-01-26.