CVE-2021-35533

Specially Crafted IEC 60870-5-104 Packet Vulnerability in RTU500 series

HIGH
7.5
CVSS Score
Published: November 26, 2021 at 04:37 PM UTC
Updated: June 17, 2026 at 03:57 AM UTC
2 products affected across 1 vendorRTU500 FirmwareRTU500

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Severity
HIGH7.5
Exploit prediction
EPSS 0.9%

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

CMU Firmware version 12.0 ≤ v ≤ 12.0.*CMU Firmware version 12.2 ≤ v ≤ 12.2.*CMU Firmware version 12.4 ≤ v ≤ 12.4.*12.012.212.4CMU Firmware version 12.0CMU Firmware version 12.2CMU Firmware version 12.4

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

CVSS

7.5HIGHHitachi Energy
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-20

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