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

    Published:Feb 24, 2026
    Last Modified:May 26, 2026
    EPS:Feb 24, 2026
    EPSS Score:0.00026
    CVSS Score:7.5

    Affected Products

    Vendor
    Hitachienergy
    Product
    Rtu500 Firmware
    Vendor
    Hitachienergy
    Product
    Rtu520
    Vendor
    Hitachienergy
    Product
    Rtu520 Firmware
    Vendor
    Hitachienergy
    Product
    Rtu530
    Vendor
    Hitachienergy
    Product
    Rtu530 Firmware
    Vendor
    Hitachienergy
    Product
    Rtu540
    Vendor
    Hitachienergy
    Product
    Rtu540 Firmware
    Vendor
    Hitachienergy
    Product
    Rtu560
    Vendor
    Hitachienergy
    Product
    Rtu560 Firmware

    Exploits

    No exploit reference

    Related CVEs

    CVE-2026-17539 (CVSS 5.9) — RTU500 has a vulnerability, where high-load scenarios, such as sending GI requests at short intervals, may cau…
    CVE-2026-8479 (CVSS 6.9) — IEC 60870-5-104 used in bidirectional mode in RTU500 is vulnerable for a NULL pointer dereferencing, if a spec…
    CVE-2026-1772 (CVSS 5.3) — RTU500 web interface: An unprivileged user can read user management information. The information cannot be acc…
    CVE-2024-2617 (CVSS 7.2) — A vulnerability exists in the RTU500 that allows for authenticated and authorized users to bypass secure updat…
    CVE-2023-6711 (CVSS 5.9) — Vulnerability exists in SCI IEC 60870-5-104 and HCI IEC 60870-5-104 that affects the RTU500 series product ver…
    CVE-2022-4608 (CVSS 7.5) — A vulnerability exists in HCI IEC 60870-5-104 function included in certain versions of the RTU500 series produ…
    CVE-2022-2502 (CVSS 7.5) — A vulnerability exists in the HCI IEC 60870-5-104 function included in certain versions of the RTU500 series p…
    CVE-2022-3353 (CVSS 5.9) — A vulnerability exists in the IEC 61850 communication stack that affects multiple Hitachi Energy products. …
    CVE-2022-28613 (CVSS 7.5) — A vulnerability exists in the HCI Modbus TCP function included in the product versions listed above. If the HC…
    CVE-2021-35533 (CVSS 7.5) — Improper Input Validation vulnerability in the APDU parser in the Bidirectional Communication Interface (BCI) …

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High