CVE-2026-1773 HIGH

CVE-2026-1773

Vendor Hitachi Energy
Product RTU500 series CMU firmware
Weakness CWE-184
Published February 24, 2026
Last update May 27, 2026
View on NVD All CVEs

CVSS base score

8.7/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality —
Integrity —

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

What the vulnerability does

01Description

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

Key dates

02Disclosure timeline

February 24, 2026 CVE published
May 27, 2026 Record updated

Related vulnerabilities

04Related CVE

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