{"id":"CVE-2020-5666","url":"https://www.cyber-defence.io/tools/cve/CVE-2020-5666","generatedAt":"2026-10-27T21:19:20.507Z","title":"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…","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.","published":"2020-11-16T01:15:13.000Z","lastModified":"2026-06-17T03:22:04.000Z","status":"Modified","sourceIdentifier":"vultures@jpcert.or.jp","cvss":{"version":"3.1","score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},"cwe":["CWE-400"],"affected":["mitsubishielectric/melsec iq-r00 firmware","mitsubishielectric/melsec iq-r01 firmware","mitsubishielectric/melsec iq-r02 firmware","mitsubishielectric/melsec iq-r04 firmware","mitsubishielectric/melsec iq-r16 firmware","mitsubishielectric/melsec iq-r08 firmware","mitsubishielectric/melsec iq-r32 firmware","mitsubishielectric/melsec iq-r120 firmware"],"epss":{"score":0.08754,"percentile":0.95126,"date":"2026-10-26","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (8.75%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[],"references":[{"url":"https://jvn.jp/en/jp/JVN44764844/index.html","tags":["Third Party Advisory"],"source":"vultures@jpcert.or.jp"},{"url":"https://jvn.jp/jp/JVN44764844/index.html","tags":["Third Party Advisory"],"source":"vultures@jpcert.or.jp"},{"url":"https://us-cert.cisa.gov/ics/advisories/icsa-20-317-01","tags":["Third Party Advisory","US Government Resource"],"source":"vultures@jpcert.or.jp"},{"url":"https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2020-015_en.pdf","tags":["Mitigation","Vendor Advisory"],"source":"vultures@jpcert.or.jp"},{"url":"https://jvn.jp/en/jp/JVN44764844/index.html","tags":["Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://jvn.jp/jp/JVN44764844/index.html","tags":["Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://us-cert.cisa.gov/ics/advisories/icsa-20-317-01","tags":["Third Party Advisory","US Government Resource"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2020-015_en.pdf","tags":["Mitigation","Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2020-5666","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}