CVE-2026-1773

IEC 60870-5-104 used in RTU500: Potential Denial of Service impact on reception of invalid U-format frame. Product is only affected if IEC 60870-5-104 bi-directional functionality is configured. E...

Published: Feb 24, 2026Updated: May 26, 2026 Sources: CVE List NVD csafCWE-184

7.5HIGH

Description

Hitachi Energy is aware of vulnerabilities that affect RTU500 product versions listed in this document. Successful exploitation of these vulnerabilities can result in the exposure of low-value user management information and device outage. Please refer to the Recommended Immediate Actions for information about the mitigation/remediation.

No summary for this CVE yet.

CVSS Vector Breakdown

Exploitability

AV:NAttack Vector

Network

AC:LAttack Complexity

Low

PR:NPrivileges Required

None

UI:NUser Interaction

None

Scope

S:UScope

Unchanged

Impact

C:NConfidentiality

None

I:NIntegrity

None

A:HAvailability

High

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Weaknesses

CWE-184

Affected Products

hitachienergy

commercial·CHaka hitachi energy ltd, hitachi energy

commercial·DE

RTU500 series CMU firmware

ICS / OT / IoT

Exploitability

Official Patch Available

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References

https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/OT/white/2026/icsa-26-062-03.json

raw.githubusercontent.com

https://publisher.hitachienergy.com/preview?DocumentID=8DBD000237&LanguageCode=en&DocumentPartId=&Action=launch

publisher.hitachienergy.com

https://www.cisa.gov/news-events/ics-advisories/icsa-26-062-03

cisa.gov

and 21 more references View all →

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