{"id":"CVE-2020-5656","aliases":["EUVD-2020-26817","GHSA-f9w6-p56j-vxgh"],"status":"published","title":"Improper access control vulnerability in TCP/IP function included in the firmware of MELSEC iQ-R...","description":"Improper access control vulnerability in TCP/IP function included in the firmware of MELSEC iQ-R series (RJ71EIP91 EtherNet/IP Network Interface Module First 2 digits of serial number are '02' or before, RJ71PN92 PROFINET IO Controller Module First 2 digits of serial number are '01' or before, RD81DL96 High Speed Data Logger Module First 2 digits of serial number are '08' or before, RD81MES96N MES Interface Module First 2 digits of serial number are '04' or before, and RD81OPC96 OPC UA Server Module First 2 digits of serial number are '04' or before) allows a remote unauthenticated attacker to stop the network functions of the products or execute a malicious program via a specially crafted packet.","severity":{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-08","score":0.02969,"percentile":0.87329,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"published":"2020-10-30T03:35:53Z","modified":"2026-06-17T03:22:02Z","products":[{"vendor":"mitsubishi electric corporation","product":"melsec iq-r series"},{"vendor":"mitsubishielectric","product":"melsec_iq-rd81dl96_firmware"},{"vendor":"mitsubishielectric","product":"melsec_iq-rd81mes96n_firmware"},{"vendor":"mitsubishielectric","product":"melsec_iq-rd81opc96_firmware"},{"vendor":"mitsubishielectric","product":"melsec_iq-rj71eip91_firmware"},{"vendor":"mitsubishielectric","product":"melsec_iq-rj71pn92_firmware"}],"references":[{"url":"https://www.mitsubishielectric.co.jp/psirt/vulnerability/pdf/2020-012.pdf","tags":["x_refsource_MISC","x_transferred","Vendor Advisory"]},{"url":"https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2020-012_en.pdf","tags":["x_refsource_MISC","x_transferred","Vendor Advisory"]},{"url":"https://jvn.jp/vu/JVNVU92513419/index.html","tags":["x_refsource_MISC","x_transferred","Third Party Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2020-5656"},{"url":"https://github.com/advisories/GHSA-f9w6-p56j-vxgh"}],"sources":{"cve":[{"id":"CVE-2020-5656","description":"Improper access control vulnerability in TCP/IP function included in the firmware of MELSEC iQ-R series (RJ71EIP91 EtherNet/IP Network Interface Module First 2 digits of serial number are '02' or before, RJ71PN92 PROFINET IO Controller Module First 2 digits of serial number are '01' or before, RD81DL96 High Speed Data Logger Module First 2 digits of serial number are '08' or before, RD81MES96N MES Interface Module First 2 digits of serial number are '04' or before, and RD81OPC96 OPC UA Server Module First 2 digits of serial number are '04' or before) allows a remote unauthenticated attacker to stop the network functions of the products or execute a malicious program via a specially crafted packet.","status":"published","published":"2020-10-30T03:35:53Z","modified":"2024-08-04T08:39:25.477Z","updated_at":"2026-11-02T14:35:47.56691Z"}],"euvd":[{"id":"EUVD-2020-26817","description":"Improper access control vulnerability in TCP/IP function included in the firmware of MELSEC iQ-R series (RJ71EIP91 EtherNet/IP Network Interface Module First 2 digits of serial number are '02' or before, RJ71PN92 PROFINET IO Controller Module First 2 digits of serial number are '01' or before, RD81DL96 High Speed Data Logger Module First 2 digits of serial number are '08' or before, RD81MES96N MES Interface Module First 2 digits of serial number are '04' or before, and RD81OPC96 OPC UA Server Module First 2 digits of serial number are '04' or before) allows a remote unauthenticated attacker to stop the network functions of the products or execute a malicious program via a specially crafted packet.","status":"published","published":"2020-10-30T03:35:53Z","modified":"2024-08-04T08:39:25Z","updated_at":"2026-11-03T03:08:06.272693Z"}],"ghsa":[{"id":"GHSA-f9w6-p56j-vxgh","title":"Improper access control vulnerability in TCP/IP function included in the firmware of MELSEC iQ-R...","description":"Improper access control vulnerability in TCP/IP function included in the firmware of MELSEC iQ-R series (RJ71EIP91 EtherNet/IP Network Interface Module First 2 digits of serial number are '02' or before, RJ71PN92 PROFINET IO Controller Module First 2 digits of serial number are '01' or before, RD81DL96 High Speed Data Logger Module First 2 digits of serial number are '08' or before, RD81MES96N MES Interface Module First 2 digits of serial number are '04' or before, and RD81OPC96 OPC UA Server Module First 2 digits of serial number are '04' or before) allows a remote unauthenticated attacker to stop the network functions of the products or execute a malicious program via a specially crafted packet.","status":"published","published":"2022-05-24T17:33:04Z","modified":"2023-01-29T05:05:13Z","updated_at":"2026-11-02T14:45:44.421144Z"}],"nvd":[{"id":"CVE-2020-5656","description":"Improper access control vulnerability in TCP/IP function included in the firmware of MELSEC iQ-R series (RJ71EIP91 EtherNet/IP Network Interface Module First 2 digits of serial number are '02' or before, RJ71PN92 PROFINET IO Controller Module First 2 digits of serial number are '01' or before, RD81DL96 High Speed Data Logger Module First 2 digits of serial number are '08' or before, RD81MES96N MES Interface Module First 2 digits of serial number are '04' or before, and RD81OPC96 OPC UA Server Module First 2 digits of serial number are '04' or before) allows a remote unauthenticated attacker to stop the network functions of the products or execute a malicious program via a specially crafted packet.","status":"published","published":"2020-11-02T21:15:33.96Z","modified":"2026-06-17T03:22:02.413Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"primary"},{"version":"2.0","score":7.5,"vector":"AV:N/AC:L/Au:N/C:P/I:P/A:P","level":"high","assessor":"primary"}],"updated_at":"2026-11-02T14:06:21.80969Z"}]}}