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High severity7.5NVD Advisory· Published Nov 26, 2021· Updated Jun 17, 2026

CVE-2021-35533

CVE-2021-35533

Description

Improper Input Validation vulnerability in the APDU parser in the Bidirectional Communication Interface (BCI) IEC 60870-5-104 function of Hitachi Energy RTU500 series allows an attacker to cause the receiving RTU500 CMU of which the BCI is enabled to reboot when receiving a specially crafted message. By default, BCI IEC 60870-5-104 function is disabled (not configured). This issue affects: Hitachi Energy RTU500 series CMU Firmware version 12.0.* (all versions); CMU Firmware version 12.2.* (all versions); CMU Firmware version 12.4.* (all versions).

Affected products

5
  • Hitachienergy/Rtu500 Firmware3 versions
    cpe:2.3:o:hitachienergy:rtu500_firmware:12.0:*:*:*:*:*:*:*+ 2 more
    • cpe:2.3:o:hitachienergy:rtu500_firmware:12.0:*:*:*:*:*:*:*
    • cpe:2.3:o:hitachienergy:rtu500_firmware:12.2:*:*:*:*:*:*:*
    • cpe:2.3:o:hitachienergy:rtu500_firmware:12.4:*:*:*:*:*:*:*
  • Hitachi/RTU500 seriesllm-fuzzy2 versions
    12.0.*, 12.2.*, 12.4.*+ 1 more
    • (no CPE)range: 12.0.*, 12.2.*, 12.4.*
    • (no CPE)range: CMU Firmware version 12.0

Patches

Vulnerability mechanics

References

1

News mentions

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