{"id":"CVE-2020-5665","aliases":["EUVD-2020-26826","GHSA-r9xw-pv6r-fxr3"],"status":"published","title":"Improper check or handling of exceptional conditions in MELSEC iQ-F series FX5U(C) CPU unit...","description":"Improper check or handling of exceptional conditions in MELSEC iQ-F series FX5U(C) CPU unit firmware version 1.060 and earlier allows an attacker to cause a denial-of-service (DoS) condition on program execution and communication by sending a specially crafted ARP packet.","severity":{"version":"3.1","score":7.4,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H","level":"high","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-11","score":0.01028,"percentile":0.64078,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-755"],"published":"2020-12-14T02:25:53Z","modified":"2026-06-17T03:22:03Z","products":[{"vendor":"mitsubishi electric corporation","product":"melsec iq-f series fx5u(c) cpu unit"},{"vendor":"mitsubishielectric","product":"melsec_iq-f_fx5u_cpu_firmware"}],"references":[{"url":"https://us-cert.cisa.gov/ics/advisories/icsa-20-345-01","tags":["x_refsource_MISC","x_transferred","Third Party Advisory","US Government Resource"]},{"url":"https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2020-018_en.pdf","tags":["x_refsource_MISC","x_transferred","Vendor Advisory"]},{"url":"https://www.mitsubishielectric.co.jp/psirt/vulnerability/pdf/2020-018.pdf","tags":["x_refsource_MISC","x_transferred","Vendor Advisory"]},{"url":"https://jvn.jp/vu/JVNVU95638588/index.html","tags":["x_refsource_MISC","x_transferred","Third Party Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2020-5665"},{"url":"https://github.com/advisories/GHSA-r9xw-pv6r-fxr3"}],"sources":{"cve":[{"id":"CVE-2020-5665","description":"Improper check or handling of exceptional conditions in MELSEC iQ-F series FX5U(C) CPU unit firmware version 1.060 and earlier allows an attacker to cause a denial-of-service (DoS) condition on program execution and communication by sending a specially crafted ARP packet.","status":"published","published":"2020-12-14T02:25:53Z","modified":"2024-08-04T08:39:25.489Z","updated_at":"2026-11-02T14:35:47.56691Z"}],"euvd":[{"id":"EUVD-2020-26826","description":"Improper check or handling of exceptional conditions in MELSEC iQ-F series FX5U(C) CPU unit firmware version 1.060 and earlier allows an attacker to cause a denial-of-service (DoS) condition on program execution and communication by sending a specially crafted ARP packet.","status":"published","published":"2020-12-14T02:25:53Z","modified":"2024-08-04T08:39:25Z","updated_at":"2026-11-03T03:08:06.272693Z"}],"ghsa":[{"id":"GHSA-r9xw-pv6r-fxr3","title":"Improper check or handling of exceptional conditions in MELSEC iQ-F series FX5U(C) CPU unit...","description":"Improper check or handling of exceptional conditions in MELSEC iQ-F series FX5U(C) CPU unit firmware version 1.060 and earlier allows an attacker to cause a denial-of-service (DoS) condition on program execution and communication by sending a specially crafted ARP packet.","status":"published","published":"2022-05-24T17:36:21Z","modified":"2023-01-29T05:05:00Z","cwes":["CWE-755"],"updated_at":"2026-11-02T14:45:41.213171Z"}],"nvd":[{"id":"CVE-2020-5665","description":"Improper check or handling of exceptional conditions in MELSEC iQ-F series FX5U(C) CPU unit firmware version 1.060 and earlier allows an attacker to cause a denial-of-service (DoS) condition on program execution and communication by sending a specially crafted ARP packet.","status":"published","published":"2020-12-14T03:15:13.653Z","modified":"2026-06-17T03:22:03.757Z","cvss":[{"version":"3.1","score":7.4,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H","level":"high","assessor":"primary"},{"version":"2.0","score":3.3,"vector":"AV:A/AC:L/Au:N/C:N/I:N/A:P","level":"low","assessor":"primary"}],"updated_at":"2026-11-02T14:06:27.10541Z"}]}}