{"id":"CVE-2021-20600","url":"https://www.cyber-defence.io/tools/cve/CVE-2021-20600","generatedAt":"2026-10-27T22:31:42.906Z","title":"Uncontrolled resource consumption in Mitsubishi Electric MELSEC iQ-R series C Controller Module R12CCPU-V Firmware Versions \"16\" and prior allows a remote unauthenticated attacker to cause a denial-of-service (DoS) condition by sending a large number of…","description":"Uncontrolled resource consumption in Mitsubishi Electric MELSEC iQ-R series C Controller Module R12CCPU-V Firmware Versions \"16\" and prior allows a remote unauthenticated attacker to cause a denial-of-service (DoS) condition by sending a large number of packets in a short time while the module starting up. System reset is required for recovery.","published":"2021-10-08T17:15:07.000Z","lastModified":"2026-06-17T03:34:06.000Z","status":"Modified","sourceIdentifier":"Mitsubishielectric.Psirt@yd.MitsubishiElectric.co.jp","cvss":{"version":"3.1","score":5.9,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H"},"cwe":["CWE-400"],"affected":["mitsubishielectric/r12ccpu-v firmware"],"epss":{"score":0.02385,"percentile":0.83807,"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":"low","text":"Lower severity and a low EPSS score (2.38%). Track it; it rarely justifies an emergency change on its own."},"changes":[],"references":[{"url":"https://jvn.jp/vu/JVNVU94914666/index.html","tags":["Third Party Advisory"],"source":"Mitsubishielectric.Psirt@yd.MitsubishiElectric.co.jp"},{"url":"https://us-cert.cisa.gov/ics/advisories/icsa-21-280-04","tags":["Third Party Advisory","US Government Resource"],"source":"Mitsubishielectric.Psirt@yd.MitsubishiElectric.co.jp"},{"url":"https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2021-015_en.pdf","tags":["Vendor Advisory"],"source":"Mitsubishielectric.Psirt@yd.MitsubishiElectric.co.jp"},{"url":"https://jvn.jp/vu/JVNVU94914666/index.html","tags":["Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://us-cert.cisa.gov/ics/advisories/icsa-21-280-04","tags":["Third Party Advisory","US Government Resource"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2021-015_en.pdf","tags":["Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2021-20600","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."}