{"id":"CVE-2021-20599","aliases":["EUVD-2021-8017","GHSA-vf46-vqq9-hg36"],"status":"published","title":"Authorization bypass through user-controlled key vulnerability in MELSEC iQ-R series Safety CPU...","description":"Cleartext Transmission of Sensitive InformationCleartext transmission of sensitive information vulnerability in MELSEC iQ-R series Safety CPU R08/16/32/120SFCPU firmware versions \"26\" and prior and MELSEC iQ-R series SIL2 Process CPU R08/16/32/120PSFCPU firmware versions \"11\" and prior allows a remote unauthenticated attacker to login to a target CPU module by obtaining credentials other than password.","severity":{"version":"3.1","score":9.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","level":"critical","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.01402,"percentile":0.7292,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-319","CWE-639","CWE-863"],"published":"2021-10-14T00:00:00Z","modified":"2026-06-17T03:34:05Z","products":[{"vendor":"mitsubishi electric corporation","product":"melsec iq-r series safety cpu r08sfcpu"},{"vendor":"mitsubishi electric corporation","product":"melsec iq-r series safety cpu r120sfcpu"},{"vendor":"mitsubishi electric corporation","product":"melsec iq-r series safety cpu r16sfcpu"},{"vendor":"mitsubishi electric corporation","product":"melsec iq-r series safety cpu r32sfcpu"},{"vendor":"mitsubishi electric corporation","product":"melsec iq-r series sil2 process cpu r08psfcpu"},{"vendor":"mitsubishi electric corporation","product":"melsec iq-r series sil2 process cpu r120psfcpu"},{"vendor":"mitsubishi electric corporation","product":"melsec iq-r series sil2 process cpu r16psfcpu"},{"vendor":"mitsubishi electric corporation","product":"melsec iq-r series sil2 process cpu r32psfcpu"},{"vendor":"mitsubishielectric","product":"melsec_iq-r08sfcpu"},{"vendor":"mitsubishielectric","product":"r08psfcpu"},{"vendor":"mitsubishielectric","product":"r08psfcpu_firmware"},{"vendor":"mitsubishielectric","product":"r08sfcpu_firmware"},{"vendor":"mitsubishielectric","product":"r120psfcpu"},{"vendor":"mitsubishielectric","product":"r120psfcpu_firmware"},{"vendor":"mitsubishielectric","product":"r120sfcpu"},{"vendor":"mitsubishielectric","product":"r120sfcpu_firmware"},{"vendor":"mitsubishielectric","product":"r16psfcpu"},{"vendor":"mitsubishielectric","product":"r16psfcpu_firmware"},{"vendor":"mitsubishielectric","product":"r16sfcpu"},{"vendor":"mitsubishielectric","product":"r16sfcpu_firmware"},{"vendor":"mitsubishielectric","product":"r32psfcpu"},{"vendor":"mitsubishielectric","product":"r32psfcpu_firmware"},{"vendor":"mitsubishielectric","product":"r32sfcpu"},{"vendor":"mitsubishielectric","product":"r32sfcpu_firmware"}],"references":[{"url":"https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2021-011_en.pdf","tags":["vendor-advisory","x_transferred","Vendor Advisory"]},{"url":"https://jvn.jp/vu/JVNVU98578731","tags":["government-resource","x_transferred","Third Party Advisory"]},{"url":"https://www.cisa.gov/uscert/ics/advisories/icsa-21-287-03","tags":["government-resource","x_transferred"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-20599"},{"url":"https://github.com/advisories/GHSA-vf46-vqq9-hg36"}],"sources":{"cve":[{"id":"CVE-2021-20599","description":"Cleartext Transmission of Sensitive InformationCleartext transmission of sensitive information vulnerability in MELSEC iQ-R series Safety CPU R08/16/32/120SFCPU firmware versions \"26\" and prior and MELSEC iQ-R series SIL2 Process CPU R08/16/32/120PSFCPU firmware versions \"11\" and prior allows a remote unauthenticated attacker to login to a target CPU module by obtaining credentials other than password.","status":"published","published":"2021-10-14T00:00:00Z","modified":"2024-08-03T17:45:44.681Z","cvss":[{"version":"3.1","score":9.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","level":"critical","assessor":"cna"}],"cwes":["CWE-319"],"updated_at":"2026-11-02T14:32:55.564736Z"}],"euvd":[{"id":"EUVD-2021-8017","description":"Cleartext Transmission of Sensitive InformationCleartext transmission of sensitive information vulnerability in MELSEC iQ-R series Safety CPU R08/16/32/120SFCPU firmware versions \"26\" and prior and MELSEC iQ-R series SIL2 Process CPU R08/16/32/120PSFCPU firmware versions \"11\" and prior allows a remote unauthenticated attacker to login to a target CPU module by obtaining credentials other than password.","status":"published","published":"2021-10-14T00:00:00Z","modified":"2024-08-03T17:45:44Z","cvss":[{"version":"3.1","score":9.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","level":"critical"}],"updated_at":"2026-11-03T03:25:08.888273Z"}],"ghsa":[{"id":"GHSA-vf46-vqq9-hg36","title":"Authorization bypass through user-controlled key vulnerability in MELSEC iQ-R series Safety CPU...","description":"Authorization bypass through user-controlled key vulnerability in MELSEC iQ-R series Safety CPU R08/16/32/120SFCPU all versions and MELSEC iQ-R series SIL2 Process CPU R08/16/32/120PSFCPU all versions allows an remote unauthenticated attacker to login to a target CPU module by obtaining credentials other than password.","status":"published","published":"2022-05-24T19:17:36Z","modified":"2024-04-28T05:02:41Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high"}],"cwes":["CWE-319","CWE-639","CWE-863"],"updated_at":"2026-11-02T14:57:15.123011Z"}],"nvd":[{"id":"CVE-2021-20599","description":"Cleartext Transmission of Sensitive InformationCleartext transmission of sensitive information vulnerability in MELSEC iQ-R series Safety CPU R08/16/32/120SFCPU firmware versions \"26\" and prior and MELSEC iQ-R series SIL2 Process CPU R08/16/32/120PSFCPU firmware versions \"11\" and prior allows a remote unauthenticated attacker to login to a target CPU module by obtaining credentials other than password.","status":"published","published":"2021-10-14T15:15:08.827Z","modified":"2026-06-17T03:34:05.783Z","cvss":[{"version":"3.1","score":9.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","level":"critical","assessor":"secondary"},{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high","assessor":"primary"},{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:P/I:N/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-319","CWE-639"],"updated_at":"2026-11-02T14:06:59.689345Z"}]}}