Mitsubishi (CVE-2020-5666)

high Tenable OT Security Plugin ID 500495

Synopsis

The remote OT asset is affected by a vulnerability.

Description

Uncontrolled resource consumption vulnerability in MELSEC iQ-R Series CPU Modules (R00/01/02CPU Firmware versions from '05' to '19' and R04/08/16/32/120(EN)CPU Firmware versions from '35' to '51') allows a remote attacker to cause an error in a CPU unit via a specially crafted HTTP packet, which may lead to a denial-of-service (DoS) condition in execution of the program and its communication.

This plugin only works with Tenable.ot.
Please visit https://www.tenable.com/products/tenable-ot for more information.

Solution

Refer to the vendor advisory.

Plugin Details

Severity: High

ID: 500495

File Name: tenable_ot_mitsubishi_CVE-2020-5666.nasl

Version: 1.10

Type: Remote

Family: Tenable.ot

Published: 2/7/2022

Updated: 6/18/2026

Supported Sensors: Tenable OT Security

Risk Information

VPR

Risk Factor: Low

Score: 3.6

CVSS v2

Risk Factor: High

Base Score: 7.1

Vector: CVSS2#AV:N/AC:M/Au:N/C:N/I:N/A:C

CVSS Score Source: CVE-2020-5666

CVSS v3

Risk Factor: High

Base Score: 7.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Vulnerability Information

CPE: cpe:/o:mitsubishielectric:melsec_iq-r08_firmware, cpe:/o:mitsubishielectric:melsec_iq-r32_firmware, cpe:/o:mitsubishielectric:melsec_iq-r01_firmware, cpe:/o:mitsubishielectric:melsec_iq-r02_firmware, cpe:/o:mitsubishielectric:melsec_iq-r00_firmware, cpe:/o:mitsubishielectric:melsec_iq-r16_firmware, cpe:/o:mitsubishielectric:melsec_iq-r120_firmware, cpe:/o:mitsubishielectric:melsec_iq-r04_firmware

Required KB Items: Tenable.ot/Mitsubishi

Exploit Ease: No known exploits are available

Patch Publication Date: 11/16/2020

Vulnerability Publication Date: 11/16/2020

Reference Information

CVE: CVE-2020-5666

CWE: 400

ICSA: 20-317-01

Detections

Analytics