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Vulnerability record · CVE-2020-5666 · published 16 November 2020

CVE-2020-5666: Mitsubishielectric melsec iq-r00 firmware uncontrolled resource consumption vulnerability

Mitsubishielectric · Melsec Iq R00 Firmware

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.

7.5 CVSS 3.1 High EPSS 8.8% · top 5.0% CWE-400 · Uncontrolled resource consumption
7.5CVSS 3.1 base score, v2 7.1
8.8%EPSS exploitation probability, 30 days
NoNot in CISA KEV
8Affected product versions listed by NVD
8References
17 Jun 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

8 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://jvn.jp/en/jp/JVN44764844/index.html Third Party Advisory
https://jvn.jp/jp/JVN44764844/index.html Third Party Advisory
https://us-cert.cisa.gov/ics/advisories/icsa-20-317-01 Third Party AdvisoryUS Government Resource
https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2020-015_en.pdf MitigationVendor Advisory
https://jvn.jp/en/jp/JVN44764844/index.html Third Party Advisory
https://jvn.jp/jp/JVN44764844/index.html Third Party Advisory
https://us-cert.cisa.gov/ics/advisories/icsa-20-317-01 Third Party AdvisoryUS Government Resource
https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2020-015_en.pdf MitigationVendor Advisory

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2020-5666), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.