CVE-2020-5666

HIGH
7.5
CVSS Score
Published: November 16, 2020 at 12:49 AM UTC
Updated: June 17, 2026 at 03:22 AM UTC
17 products affected across 1 vendorMELSEC Iq R02 FirmwareMELSEC Iq R08 FirmwareMELSEC Iq R32 Firmware

Using MELSEC iQ-R Series CPU Modules by Mitsubishi Electric Corporation?

Get instant alerts when new vulnerabilities affect MELSEC iQ-R Series CPU Modules - before attackers find them.

Real-time alertsTrack your software stackFree plan available
Severity
HIGH7.5
Exploit prediction
EPSS 9%

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.

Affected

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

5 ≤ v ≤ 19
mitsubishielectric-melsec-iq-r00 (same device)
5 ≤ v ≤ 19
mitsubishielectric-melsec-iq-r01 (same device)
5 ≤ v ≤ 19
mitsubishielectric-melsec-iq-r02 (same device)
35 ≤ v ≤ 51
mitsubishielectric-melsec-iq-r04 (same device)
35 ≤ v ≤ 51
mitsubishielectric-melsec-iq-r08 (same device)
35 ≤ v ≤ 51
mitsubishielectric-melsec-iq-r120 (same device)
35 ≤ v ≤ 51
mitsubishielectric-melsec-iq-r16 (same device)
35 ≤ v ≤ 51
mitsubishielectric-melsec-iq-r32 (same device)

Remediation

No guide yet

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

References (4)

x_refsource_MISCThird Party Advisory
https://jvn.jp/en/jp/JVN44764844/index.html
x_refsource_MISCThird Party Advisory
https://jvn.jp/jp/JVN44764844/index.html
x_refsource_MISCThird Party AdvisoryUS Government Resource
https://us-cert.cisa.gov/ics/advisories/icsa-20-317-01

CVSS

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

Quick Info

StatusMODIFIED
CWE
CWE-400

Get alerted

Stop reading CVE feeds looking for your own stack

Track the products you run and VulnTracker tells you when a new CVE affects them — with what is known about fixing it, and nothing about the rest.

Free plan, no card