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    CVE-2026-17539

    RTU500 has a vulnerability, where high-load scenarios, such as sending GI requests at short intervals, may cause a NULL pointer dereference in the last entry of the enhanced message queue. This can cause a BCI_IEC104 fatal write error, resulting in connection interruption and restart, and ultimately a denial of service for bidirectional IEC 60870-5-104 communication.

    Published:Sep 3, 2026
    Last Modified:Sep 3, 2026
    EPS:Sep 3, 2026
    EPSS Score:0.00351
    CVSS Score:5.9

    Affected Products

    Vendor
    Hitachienergy
    Product
    Rtu500 Firmware

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-476 NULL Pointer Dereference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

    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-2026-1773 (CVSS 8.7) — IEC 60870-5-104 used in RTU500: Potential Denial of Service impact on reception of invalid U-format frame. Pro…
    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