{"id":"CVE-2021-27477","aliases":["EUVD-2021-14231","GHSA-xqpg-rjjg-58q9"],"status":"published","title":"When JTEKT Corporation TOYOPUC PLC versions PC10G-CPU, 2PORT-EFR, Plus CPU, Plus EX, Plus EX2,...","description":"When JTEKT Corporation TOYOPUC PLC versions PC10G-CPU, 2PORT-EFR, Plus CPU, Plus EX, Plus EX2, Plus EFR, Plus EFR2, Plus 2P-EFR, PC10P-DP, PC10P-DP-IO, Plus BUS-EX, Nano 10GX, Nano 2ET,PC10PE, PC10PE-16/16P, PC10E, FL/ET-T-V2H, PC10B,PC10B-P, Nano CPU, PC10P, and PC10GE receive an invalid frame, the outside area of a receive buffer for FL-net are overwritten. As a result, the PLC CPU detects a system error, and the affected products stop.","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":0.01125,"percentile":0.66549,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-119","CWE-787"],"published":"2021-07-01T12:01:36Z","modified":"2026-06-17T03:44:56Z","products":[{"vendor":"jtekt","product":"2port-efr_firmware"},{"vendor":"jtekt","product":"fl\\/et-t-v2h_firmware"},{"vendor":"jtekt","product":"nano_10gx_firmware"},{"vendor":"jtekt","product":"nano_2et_firmware"},{"vendor":"jtekt","product":"nano_cpu_firmware"},{"vendor":"jtekt","product":"pc10b-p_firmware"},{"vendor":"jtekt","product":"pc10b_firmware"},{"vendor":"jtekt","product":"pc10e_firmware"},{"vendor":"jtekt","product":"pc10g-cpu_firmware"},{"vendor":"jtekt","product":"pc10ge_firmware"},{"vendor":"jtekt","product":"pc10p-dp-io_firmware"},{"vendor":"jtekt","product":"pc10p-dp_firmware"},{"vendor":"jtekt","product":"pc10p_firmware"},{"vendor":"jtekt","product":"pc10pe-16\\/16p_firmware"},{"vendor":"jtekt","product":"pc10pe_firmware"},{"vendor":"jtekt","product":"plus_2p-efr_firmware"},{"vendor":"jtekt","product":"plus_bus-ex_firmware"},{"vendor":"jtekt","product":"plus_cpu_firmware"},{"vendor":"jtekt","product":"plus_efr2_firmware"},{"vendor":"jtekt","product":"plus_efr_firmware"},{"vendor":"jtekt","product":"plus_ex2_firmware"},{"vendor":"jtekt","product":"plus_ex_firmware"}],"references":[{"url":"https://us-cert.cisa.gov/ics/advisories/icsa-21-180-04","tags":["x_refsource_MISC","x_transferred","Third Party Advisory","US Government Resource"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-27477"},{"url":"https://github.com/advisories/GHSA-xqpg-rjjg-58q9"}],"sources":{"cve":[{"id":"CVE-2021-27477","description":"When JTEKT Corporation TOYOPUC PLC versions PC10G-CPU, 2PORT-EFR, Plus CPU, Plus EX, Plus EX2, Plus EFR, Plus EFR2, Plus 2P-EFR, PC10P-DP, PC10P-DP-IO, Plus BUS-EX, Nano 10GX, Nano 2ET,PC10PE, PC10PE-16/16P, PC10E, FL/ET-T-V2H, PC10B,PC10B-P, Nano CPU, PC10P, and PC10GE receive an invalid frame, the outside area of a receive buffer for FL-net are overwritten. As a result, the PLC CPU detects a system error, and the affected products stop.","status":"published","published":"2021-07-01T12:01:36Z","modified":"2024-08-03T20:48:17.271Z","cwes":["CWE-119"],"updated_at":"2026-11-02T14:33:04.679189Z"}],"euvd":[{"id":"EUVD-2021-14231","description":"When JTEKT Corporation TOYOPUC PLC versions PC10G-CPU, 2PORT-EFR, Plus CPU, Plus EX, Plus EX2, Plus EFR, Plus EFR2, Plus 2P-EFR, PC10P-DP, PC10P-DP-IO, Plus BUS-EX, Nano 10GX, Nano 2ET,PC10PE, PC10PE-16/16P, PC10E, FL/ET-T-V2H, PC10B,PC10B-P, Nano CPU, PC10P, and PC10GE receive an invalid frame, the outside area of a receive buffer for FL-net are overwritten. As a result, the PLC CPU detects a system error, and the affected products stop.","status":"published","published":"2021-07-01T12:01:36Z","modified":"2024-08-03T20:48:17Z","updated_at":"2026-11-03T03:24:48.919164Z"}],"ghsa":[{"id":"GHSA-xqpg-rjjg-58q9","title":"When JTEKT Corporation TOYOPUC PLC versions PC10G-CPU, 2PORT-EFR, Plus CPU, Plus EX, Plus EX2,...","description":"When JTEKT Corporation TOYOPUC PLC versions PC10G-CPU, 2PORT-EFR, Plus CPU, Plus EX, Plus EX2, Plus EFR, Plus EFR2, Plus 2P-EFR, PC10P-DP, PC10P-DP-IO, Plus BUS-EX, Nano 10GX, Nano 2ET,PC10PE, PC10PE-16/16P, PC10E, FL/ET-T-V2H, PC10B,PC10B-P, Nano CPU, PC10P, and PC10GE receive an invalid frame, the outside area of a receive buffer for FL-net are overwritten. As a result, the PLC CPU detects a system error, and the affected products stop.","status":"published","published":"2022-05-24T19:06:43Z","modified":"2023-01-28T05:08:10Z","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"}],"cwes":["CWE-119","CWE-787"],"updated_at":"2026-11-02T14:44:36.474417Z"}],"nvd":[{"id":"CVE-2021-27477","description":"When JTEKT Corporation TOYOPUC PLC versions PC10G-CPU, 2PORT-EFR, Plus CPU, Plus EX, Plus EX2, Plus EFR, Plus EFR2, Plus 2P-EFR, PC10P-DP, PC10P-DP-IO, Plus BUS-EX, Nano 10GX, Nano 2ET,PC10PE, PC10PE-16/16P, PC10E, FL/ET-T-V2H, PC10B,PC10B-P, Nano CPU, PC10P, and PC10GE receive an invalid frame, the outside area of a receive buffer for FL-net are overwritten. As a result, the PLC CPU detects a system error, and the affected products stop.","status":"published","published":"2021-07-01T13:15:08.003Z","modified":"2026-06-17T03:44:56.673Z","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":7.8,"vector":"AV:N/AC:L/Au:N/C:N/I:N/A:C","level":"high","assessor":"primary"}],"cwes":["CWE-119","CWE-787"],"updated_at":"2026-11-02T14:06:55.259633Z"}]}}