{"id":"CVE-2021-20598","aliases":["EUVD-2021-8016","GHSA-f5j9-pg8j-928p"],"status":"published","title":"Overly Restrictive Account Lockout Mechanism vulnerability in Mitsubishi Electric MELSEC iQ-R...","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.","severity":{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-10","score":0.01513,"percentile":0.74702,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-287"],"published":"2021-08-06T16:53:47Z","modified":"2026-06-17T03:34:05Z","products":[{"vendor":"mitsubishielectric","product":"r08psfcpu_firmware"},{"vendor":"mitsubishielectric","product":"r08sfcpu_firmware"},{"vendor":"mitsubishielectric","product":"r120psfcpu_firmware"},{"vendor":"mitsubishielectric","product":"r120sfcpu_firmware"},{"vendor":"mitsubishielectric","product":"r16psfcpu_firmware"},{"vendor":"mitsubishielectric","product":"r16sfcpu_firmware"},{"vendor":"mitsubishielectric","product":"r32psfcpu_firmware"},{"vendor":"mitsubishielectric","product":"r32sfcpu_firmware"}],"references":[{"url":"https://jvn.jp/vu/JVNVU98578731/index.html","tags":["x_refsource_MISC","x_transferred","Third Party Advisory"]},{"url":"https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2021-010_en.pdf","tags":["x_refsource_MISC","x_transferred","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-20598"},{"url":"https://github.com/advisories/GHSA-f5j9-pg8j-928p"}],"sources":{"cve":[{"id":"CVE-2021-20598","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.","status":"published","published":"2021-08-06T16:53:47Z","modified":"2024-08-03T17:45:44.713Z","updated_at":"2026-11-02T14:32:55.905855Z"}],"euvd":[{"id":"EUVD-2021-8016","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.","status":"published","published":"2021-08-06T16:53:47Z","modified":"2024-08-03T17:45:44Z","updated_at":"2026-11-03T03:25:08.888273Z"}],"ghsa":[{"id":"GHSA-f5j9-pg8j-928p","title":"Overly Restrictive Account Lockout Mechanism vulnerability in Mitsubishi Electric MELSEC iQ-R...","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.","status":"published","published":"2022-05-24T19:10:16Z","modified":"2023-01-30T05:01:18Z","cwes":["CWE-287"],"updated_at":"2026-11-02T14:46:22.963176Z"}],"nvd":[{"id":"CVE-2021-20598","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.","status":"published","published":"2021-08-06T17:15:07.173Z","modified":"2026-06-17T03:34:05.657Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium","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-287"],"updated_at":"2026-11-02T14:06:56.562207Z"}]}}