{"id":"CVE-2020-5527","aliases":["EUVD-2020-26690","GHSA-5jq2-477f-97vj"],"status":"published","title":"When MELSOFT transmission port (UDP/IP) of Mitsubishi Electric MELSEC iQ-R series (all versions),...","description":"When MELSOFT transmission port (UDP/IP) of Mitsubishi Electric MELSEC iQ-R series (all versions), MELSEC iQ-F series (all versions), MELSEC Q series (all versions), MELSEC L series (all versions), and MELSEC F series (all versions) receives massive amount of data via unspecified vectors, resource consumption occurs and the port does not process the data properly. As a result, it may fall into a denial-of-service (DoS) condition. The vendor states this vulnerability only affects Ethernet communication functions.","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":"2026-11-10","score":0.01365,"percentile":0.72041,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-400"],"published":"2020-03-30T07:10:14Z","modified":"2026-06-17T03:21:32Z","products":[{"vendor":"mitsubishi electric corporation","product":"melsoft transmission port (udp/ip) of multiple mitsubishi electric melsec series"},{"vendor":"mitsubishielectric","product":"cr800-q_firmware"},{"vendor":"mitsubishielectric","product":"fx3g_firmware"},{"vendor":"mitsubishielectric","product":"fx3gc_firmware"},{"vendor":"mitsubishielectric","product":"fx3s_firmware"},{"vendor":"mitsubishielectric","product":"fx3u_firmware"},{"vendor":"mitsubishielectric","product":"fx3uc_firmware"},{"vendor":"mitsubishielectric","product":"fx5u_firmware"},{"vendor":"mitsubishielectric","product":"fx5uc_firmware"},{"vendor":"mitsubishielectric","product":"fx5uj_firmware"},{"vendor":"mitsubishielectric","product":"l02cpu-p_firmware"},{"vendor":"mitsubishielectric","product":"l02cpu_firmware"},{"vendor":"mitsubishielectric","product":"l02scpu-p_firmware"},{"vendor":"mitsubishielectric","product":"l02scpu_firmware"},{"vendor":"mitsubishielectric","product":"l06cpu-p_firmware"},{"vendor":"mitsubishielectric","product":"l06cpu_firmware"},{"vendor":"mitsubishielectric","product":"l26cpu-bt_firmware"},{"vendor":"mitsubishielectric","product":"l26cpu-p_firmware"},{"vendor":"mitsubishielectric","product":"l26cpu-pbt_firmware"},{"vendor":"mitsubishielectric","product":"l26cpu_firmware"},{"vendor":"mitsubishielectric","product":"q02phcpu_firmware"},{"vendor":"mitsubishielectric","product":"q06phcpu_firmware"},{"vendor":"mitsubishielectric","product":"q12dccpu-v_firmware"},{"vendor":"mitsubishielectric","product":"q12phcpu_firmware"},{"vendor":"mitsubishielectric","product":"q12prhcpu_firmware"},{"vendor":"mitsubishielectric","product":"q172dscpu_firmware"},{"vendor":"mitsubishielectric","product":"q173dscpu_firmware"},{"vendor":"mitsubishielectric","product":"q173nccpu_firmware"},{"vendor":"mitsubishielectric","product":"q24dhccpu-ls_firmware"},{"vendor":"mitsubishielectric","product":"q24dhccpu-v_firmware"},{"vendor":"mitsubishielectric","product":"q24dhccpu-vg2_firmware"},{"vendor":"mitsubishielectric","product":"q25phcpu_firmware"},{"vendor":"mitsubishielectric","product":"q25prhcpu_firmware"},{"vendor":"mitsubishielectric","product":"q26dhccpu-ls_firmware"},{"vendor":"mitsubishielectric","product":"r00cpu_firmware"},{"vendor":"mitsubishielectric","product":"r01cpu_firmware"},{"vendor":"mitsubishielectric","product":"r02cpu_firmware"},{"vendor":"mitsubishielectric","product":"r04cpu_firmware"},{"vendor":"mitsubishielectric","product":"r04encpu_firmware"},{"vendor":"mitsubishielectric","product":"r08cpu_firmware"},{"vendor":"mitsubishielectric","product":"r08encpu_firmware"},{"vendor":"mitsubishielectric","product":"r120cpu_firmware"},{"vendor":"mitsubishielectric","product":"r120encpu_firmware"},{"vendor":"mitsubishielectric","product":"r16cpu_firmware"},{"vendor":"mitsubishielectric","product":"r16encpu_firmware"},{"vendor":"mitsubishielectric","product":"r32cpu_firmware"},{"vendor":"mitsubishielectric","product":"r32encpu_firmware"}],"references":[{"url":"https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2019-005_en.pdf","tags":["x_refsource_MISC","x_transferred","Vendor Advisory"]},{"url":"https://jvn.jp/en/vu/JVNVU91553662/index.html","tags":["x_refsource_MISC","x_transferred","Third Party Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2020-5527"},{"url":"https://github.com/advisories/GHSA-5jq2-477f-97vj"}],"sources":{"cve":[{"id":"CVE-2020-5527","description":"When MELSOFT transmission port (UDP/IP) of Mitsubishi Electric MELSEC iQ-R series (all versions), MELSEC iQ-F series (all versions), MELSEC Q series (all versions), MELSEC L series (all versions), and MELSEC F series (all versions) receives massive amount of data via unspecified vectors, resource consumption occurs and the port does not process the data properly. As a result, it may fall into a denial-of-service (DoS) condition. The vendor states this vulnerability only affects Ethernet communication functions.","status":"published","published":"2020-03-30T07:10:14Z","modified":"2024-08-04T08:30:24.568Z","updated_at":"2026-11-02T14:35:47.56691Z"}],"euvd":[{"id":"EUVD-2020-26690","description":"When MELSOFT transmission port (UDP/IP) of Mitsubishi Electric MELSEC iQ-R series (all versions), MELSEC iQ-F series (all versions), MELSEC Q series (all versions), MELSEC L series (all versions), and MELSEC F series (all versions) receives massive amount of data via unspecified vectors, resource consumption occurs and the port does not process the data properly. As a result, it may fall into a denial-of-service (DoS) condition. The vendor states this vulnerability only affects Ethernet communication functions.","status":"published","published":"2020-03-30T07:10:14Z","modified":"2024-08-04T08:30:24Z","updated_at":"2026-11-03T03:08:06.745484Z"}],"ghsa":[{"id":"GHSA-5jq2-477f-97vj","title":"When MELSOFT transmission port (UDP/IP) of Mitsubishi Electric MELSEC iQ-R series (all versions),...","description":"When MELSOFT transmission port (UDP/IP) of Mitsubishi Electric MELSEC iQ-R series (all versions), MELSEC iQ-F series (all versions), MELSEC Q series (all versions), MELSEC L series (all versions), and MELSEC F series (all versions) receives massive amount of data via unspecified vectors, resource consumption occurs and the port does not process the data properly. As a result, it may fall into a denial-of-service (DoS) condition. The vendor states this vulnerability only affects Ethernet communication functions.","status":"published","published":"2022-05-24T17:12:57Z","modified":"2023-01-29T05:02:05Z","updated_at":"2026-11-02T14:44:59.173471Z"}],"nvd":[{"id":"CVE-2020-5527","description":"When MELSOFT transmission port (UDP/IP) of Mitsubishi Electric MELSEC iQ-R series (all versions), MELSEC iQ-F series (all versions), MELSEC Q series (all versions), MELSEC L series (all versions), and MELSEC F series (all versions) receives massive amount of data via unspecified vectors, resource consumption occurs and the port does not process the data properly. As a result, it may fall into a denial-of-service (DoS) condition. The vendor states this vulnerability only affects Ethernet communication functions.","status":"published","published":"2020-03-30T08:15:17.64Z","modified":"2026-06-17T03:21:32.63Z","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":5,"vector":"AV:N/AC:L/Au:N/C:N/I:N/A:P","level":"medium","assessor":"primary"}],"cwes":["CWE-400"],"updated_at":"2026-11-02T14:05:56.580228Z"}]}}