What is CVE-2021-35533?

CVE-2021-35533 is a high-severity vulnerability in Hitachi Energy Rtu500 Series, classified under Improper Input Validation. CVSS score: 7.5/10. Published 2021-11-26.

How severe is CVE-2021-35533?

High severity. CVSS v3 base score is 7.5 out of 10.

Improper input validation in Hitachi Energy Rtu500 Series

CVE-2021-35533

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).

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

EPSS: 0.009 (56.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Hitachi Energy Rtu500 Series — versions CMU Firmware version 12.0, CMU Firmware version 12.2, CMU Firmware version 12.4
Hitachienergy Rtu500
Hitachienergy Rtu500_firmware — versions 12.0, 12.2, 12.4

Weakness classification (CWE)

CWE-20 — Improper Input Validation

References

cybersecurity@hitachienergy.com (x_refsource_CONFIRM, Vendor Advisory)

Frequently asked questions

What is CVE-2021-35533?: CVE-2021-35533 is a high-severity vulnerability in Hitachi Energy Rtu500 Series, classified under Improper Input Validation. CVSS score: 7.5/10. Published 2021-11-26.
How severe is CVE-2021-35533?: High severity. CVSS v3 base score is 7.5 out of 10.