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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
NVD MITRE
7.5CVSSHIGH
EPSS Score
0.4%
Top 67.4%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:NI:NA:H
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
Open in CVSS calculator →

Weaknesses

CWE-184

Affected Products

RTU500 series CMU firmwareHitachi EnergyICS / OT / IoT
rtu540 firmwarehitachienergyICS / OT / IoT
rtu560 firmwarehitachienergyICS / OT / IoT
rtu520 firmwarehitachienergyICS / OT / IoT
rtu530 firmwarehitachienergyICS / OT / IoT
hitachi energycommercialDEICS / OT / IoT
hitachienergycommercialCHICS / OT / IoTaka hitachi energy, hitachi energy ltd

Exploitability

Official Patch Available

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 →

Timeline

Published
Feb 24, 2026
Last Updated
May 26, 2026

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