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CVE-2024-2617 Hitachi Energy CVE debrief

CVE-2024-2617 is a HIGH severity vulnerability (CVSS 7.2) in Hitachi Energy RTU500 series CMU Firmware that allows authenticated and authorized users to bypass secure update mechanisms when the secure update feature is not enabled on all Communication and Measurement Units (CMUs) of an RTU500. Successful exploitation could enable a malicious actor to update the RTU500 with unsigned firmware, potentially compromising device integrity and operational security in industrial control environments. The vulnerability was initially published on April 30, 2024, and has undergone multiple advisory updates through March 3, 2026, including revisions to fixed version information and vulnerability descriptions. Affected versions span multiple firmware branches: 13.2.1–13.2.7, 13.4.1–13.4.4, and 13.5.1–13.5.3. Vendor fixes are available—versions 13.5.4 or later for the 13.5.x branch, and 13.7.7 or later for other affected branches—with remediation requiring both firmware updates and enabling the secure update feature on all CMUs. Organizations should prioritize patching and configuration hardening given the network-accessible attack vector and high impact potential (complete confidentiality, integrity, and availability compromise) for authenticated attackers.

Vendor
Hitachi Energy
Product
RTU500 series CMU Firmware
CVSS
HIGH 7.2
CISA KEV
Not listed in stored evidence
Original CVE published
2024-04-30
Original CVE updated
2026-03-03
Advisory published
2024-04-30
Advisory updated
2026-03-03

Who should care

Asset owners and operators of Hitachi Energy RTU500 remote terminal units in electric utility, oil and gas, water/wastewater, and other critical infrastructure sectors; industrial cybersecurity teams responsible for firmware integrity and secure update lifecycle management; OT security architects designing defense-in-depth strategies for distributed RTU deployments; compliance officers tracking NERC CIP, IEC 62351, or sector-specific security requirements for firmware authenticity; and incident response teams monitoring for indicators of firmware compromise in SCADA/EMS environments.

Technical summary

The RTU500 series CMU Firmware contains a logic flaw where the secure update feature, when not uniformly enabled across all CMUs in an RTU500 deployment, can be bypassed by authenticated and authorized users. This bypass permits the installation of firmware images lacking cryptographic signatures, violating the intended trust boundary for firmware updates. The vulnerability stems from inconsistent enforcement of secure update policies across distributed CMU components rather than a cryptographic implementation defect. Attack vector is network-based (AV:N) with low attack complexity (AC:L) and high privileges required (PR:H), reflecting that valid credentials are necessary but no user interaction is needed (UI:N). Impact is rated HIGH across all three security dimensions: complete loss of confidentiality (C:H), integrity (I:H), and availability (A:H) of the affected device. The scope remains unchanged (S:U) as exploitation does not extend beyond the vulnerable component. Multiple firmware branches are affected, with version-specific fixes released—13.5.4 for the 13.5.x line and 13.7.7 for broader coverage—alongside mandatory configuration changes to enable secure update on all CMUs.

Defensive priority

HIGH

Recommended defensive actions

  • Upgrade RTU500 CMU Firmware to version 13.5.4 or later for 13.5.x deployments, or version 13.7.7 or later for other affected branches
  • Enable the secure update feature on all CMUs within each RTU500 installation
  • Verify secure update configuration consistency across all CMUs in multi-unit deployments
  • Review and restrict administrative access to RTU500 management interfaces
  • Monitor for unauthorized firmware update attempts in security logs
  • Apply network segmentation controls to limit RTU500 management interface exposure
  • Consult vendor security advisory for deployment-specific hardening guidance

Evidence notes

Vulnerability description and affected product versions derived from CISA CSAF advisory ICSA-25-023-02. CVSS vector AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H indicates network-accessible attack with high privileges required but no user interaction. Remediation guidance specifies version-specific fixes and mandatory secure update feature enablement. Advisory revision history shows ongoing vendor coordination and description refinements through March 2026.

Sources and references

Verified primary and authoritative sources

  • CVE-2024-2617 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2024-2617

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2024-2617 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2024-2617

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

  • Source item URL

    Unverified legacy reference

    URL: https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/OT/white/2025/icsa-25-023-02.json

    cisa_csaf

  • Source reference

    Unverified legacy reference

    URL: https://www.cisa.gov/news-events/ics-advisories/icsa-25-023-02

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://www.cisa.gov/news-events/ics-alerts/ics-alert-10-301-01

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://www.cisa.gov/resources-tools/resources/ics-recommended-practices

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://www.cisa.gov/topics/industrial-control-systems

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://www.cisa.gov/sites/default/files/recommended_practices/NCCIC_ICS-CERT_Defense_in_Depth_2016_S508C.pdf

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://www.cisa.gov/sites/default/files/publications/Cybersecurity_Best_Practices_for_Industrial_Control_Systems.pdf

    Reference

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.