CVE-2026-1773 PUBLISHED

Assigner: Hitachi Energy
Reserved: 02.02.2026 Published: 24.02.2026 Updated: 24.02.2026

IEC 60870-5-104: 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. Enabling secure communication following IEC 62351-3 does not remediate the vulnerability but mitigates the risk of exploitation.

Metrics

CVSS 4.0

CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
CVSS Score: 8.7

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	None	Confidentiality	None
Attack Complexity	Low	Integrity	None	Integrity	None
Attack Requirements	None	Availability	High	Availability	None
Privileges Required	None
User Interaction	None

CVSS 4.0

Product Status

Vendor	Hitachi Energy
Product	RTU500 series CMU firmware
Versions	Default: unaffected affected from 12.7.1 to 12.7.7 (incl.) affected from 13.5.1 to 13.5.4 (incl.) affected from 13.6.1 to 13.6.2 (incl.) affected from 13.7.1 to 13.7.7 (incl.) Version 13.8.1 is affected

References

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

Problem Types

CWE-184 Incomplete List of Disallowed Inputs CWE

Impacts

CAPEC-278 Web Services Protocol Manipulation