{"cve":"CVE-2021-20598","nvd":{"published":"2021-08-06T17:15:07.173","modified":"2026-06-17T03:34:05.657","status":"Modified","description":"Overly Restrictive Account Lockout Mechanism vulnerability in Mitsubishi Electric MELSEC iQ-R series CPU modules (R08/16/32/120SFCPU all versions, R08/16/32/120PSFCPU all versions) allows a remote unauthenticated attacker to lockout a legitimate user by continuously trying login with incorrect password.","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:L","score":5.3},"cwes":["CWE-287"],"references":["https://jvn.jp/vu/JVNVU98578731/index.html","https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2021-010_en.pdf","https://jvn.jp/vu/JVNVU98578731/index.html","https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2021-010_en.pdf"],"products":["mitsubishielectric:r08psfcpu_firmware","mitsubishielectric:r08sfcpu_firmware","mitsubishielectric:r120psfcpu_firmware","mitsubishielectric:r120sfcpu_firmware","mitsubishielectric:r16psfcpu_firmware","mitsubishielectric:r16sfcpu_firmware","mitsubishielectric:r32psfcpu_firmware","mitsubishielectric:r32sfcpu_firmware"],"source":"nvd","synced_at":"2026-10-19T21:21:13.713336758+00:00"},"epss":{"cve":"CVE-2021-20598","score":0.01513,"percentile":0.74491,"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."]}