{"cve":"CVE-2021-20612","nvd":{"published":"2022-01-14T20:15:09.850","modified":"2026-06-17T03:34:07.477","status":"Modified","description":"Lack of administrator control over security vulnerability in MELSEC-F series FX3U-ENET Firmware version 1.14 and prior, FX3U-ENET-L Firmware version 1.14 and prior and FX3U-ENET-P502 Firmware version 1.14 and prior allows a remote unauthenticated attacker to cause a denial-of-service (DoS) condition in communication function of the product or other unspecified effects by sending specially crafted packets to an unnecessary opening of TCP port. Control by MELSEC-F series PLC is not affected by this vulnerability, but system reset is required for recovery.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5},"cwes":[],"references":["https://jvn.jp/vu/JVNVU93268332/index.html","https://www.cisa.gov/uscert/ics/advisories/icsa-22-013-01","https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2021-023_en.pdf","https://jvn.jp/vu/JVNVU93268332/index.html","https://www.cisa.gov/uscert/ics/advisories/icsa-22-013-01"],"products":["mitsubishielectric:fx3u-enet-l_firmware","mitsubishielectric:fx3u-enet-p502_firmware","mitsubishielectric:fx3u-enet_firmware"],"source":"nvd","synced_at":"2026-10-19T21:27:20.926095847+00:00"},"epss":{"cve":"CVE-2021-20612","score":0.03595,"percentile":0.89445,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}