{"id":"CVE-2020-5666","aliases":["EUVD-2020-26827","GHSA-5527-cm29-m2f3"],"status":"published","title":"Uncontrolled resource consumption vulnerability in MELSEC iQ-R Series CPU Modules (R00/01/02CPU...","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.","severity":{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-11","score":0.08754,"percentile":0.95227,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-400"],"published":"2020-11-16T00:49:55Z","modified":"2026-06-17T03:22:03Z","products":[{"vendor":"mitsubishi electric corporation","product":"melsec iq-r series cpu modules"},{"vendor":"mitsubishielectric","product":"melsec_iq-r00_firmware"},{"vendor":"mitsubishielectric","product":"melsec_iq-r01_firmware"},{"vendor":"mitsubishielectric","product":"melsec_iq-r02_firmware"},{"vendor":"mitsubishielectric","product":"melsec_iq-r04_firmware"},{"vendor":"mitsubishielectric","product":"melsec_iq-r08_firmware"},{"vendor":"mitsubishielectric","product":"melsec_iq-r120_firmware"},{"vendor":"mitsubishielectric","product":"melsec_iq-r16_firmware"},{"vendor":"mitsubishielectric","product":"melsec_iq-r32_firmware"}],"references":[{"url":"https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2020-015_en.pdf","tags":["x_refsource_MISC","x_transferred","Mitigation","Vendor Advisory"]},{"url":"https://jvn.jp/jp/JVN44764844/index.html","tags":["x_refsource_MISC","x_transferred","Third Party Advisory"]},{"url":"https://jvn.jp/en/jp/JVN44764844/index.html","tags":["x_refsource_MISC","x_transferred","Third Party Advisory"]},{"url":"https://us-cert.cisa.gov/ics/advisories/icsa-20-317-01","tags":["x_refsource_MISC","x_transferred","Third Party Advisory","US Government Resource"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2020-5666"},{"url":"https://github.com/advisories/GHSA-5527-cm29-m2f3"}],"sources":{"cve":[{"id":"CVE-2020-5666","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.","status":"published","published":"2020-11-16T00:49:55Z","modified":"2024-08-04T08:39:25.681Z","updated_at":"2026-11-02T14:35:47.56691Z"}],"euvd":[{"id":"EUVD-2020-26827","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.","status":"published","published":"2020-11-16T00:49:55Z","modified":"2024-08-04T08:39:25Z","updated_at":"2026-11-03T03:08:06.272693Z"}],"ghsa":[{"id":"GHSA-5527-cm29-m2f3","title":"Uncontrolled resource consumption vulnerability in MELSEC iQ-R Series CPU Modules (R00/01/02CPU...","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.","status":"published","published":"2022-05-24T17:34:22Z","modified":"2023-01-29T05:04:46Z","cwes":["CWE-400"],"updated_at":"2026-11-02T14:45:37.901426Z"}],"nvd":[{"id":"CVE-2020-5666","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.","status":"published","published":"2020-11-16T01:15:13.327Z","modified":"2026-06-17T03:22:03.86Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"primary"},{"version":"2.0","score":7.1,"vector":"AV:N/AC:M/Au:N/C:N/I:N/A:C","level":"high","assessor":"primary"}],"cwes":["CWE-400"],"updated_at":"2026-11-02T14:06:24.137599Z"}]}}