CVE-2021-35533

HIGH

Hitachi Energy RTU500 CMU Firmware 12.0.*, 12.2.*, 12.4.* - Denial of Service via APDU Parser Input Validation

Title source: llm
STIX 2.1

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).

References (1)

Core 1

Scores

CVSS v3 7.5
EPSS 0.0092
EPSS Percentile 55.8%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Details

CWE
CWE-20
Status published
Products (3)
hitachienergy/rtu500_firmware 12.0
hitachienergy/rtu500_firmware 12.2
hitachienergy/rtu500_firmware 12.4
Published Nov 26, 2021
Tracked Since Feb 18, 2026