CVE-2025-39203Network attack vector

Communication disruption via crafted IEC 61850-8 messages

Published Jun 24, 2025 · Updated Oct 7, 2025

IEC 61850 denial of service in Hitachi Energy MicroSCADA X SYS600 10.5 through 10.6 allows remote authenticated users to cause a disconnection loop. The IEC 61850 interface improperly validates crafted IEC 61850-8 message content from an IED or remote system before processing it. Network access to the IEC 61850 interface and low privileges are required; successful exploitation repeatedly disconnects communications.

CVSS severity7.1
High
EPSS probability0.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

IEC 61850 denial of service in Hitachi Energy MicroSCADA X SYS600 10.5 through 10.6 allows remote authenticated users to cause a disconnection loop. The IEC 61850 interface improperly validates crafted IEC 61850-8 message content from an IED or remote system before processing it. Network access to the IEC 61850 interface and low privileges are required; successful exploitation repeatedly disconnects communications.

The record

CVE
CVE-2025-39203
Published
Jun 24, 2025
Updated
Oct 7, 2025
Vendor
Hitachi Energy
Product
MicroSCADA X SYS600
Classifications
CWE-354, T1499.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 24, 2025CVE publishedPublication date reported by the CVE source.
  2. Oct 7, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=10.5 <=10.6

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Hitachi Energy · MicroSCADA X SYS600version=10.5 <=10.6

Published CVSS scores

7.1Hitachi EnergyCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
6.5Hitachi EnergyCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-354Improper Validation of Integrity Check Value
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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