{"id":"CVE-2021-20597","aliases":["EUVD-2021-8015","GHSA-46vr-p4g8-f826"],"status":"published","title":"Insufficiently Protected Credentials vulnerability in Mitsubishi Electric MELSEC iQ-R series CPU...","description":"Insufficiently Protected Credentials vulnerability in Mitsubishi Electric MELSEC iQ-R series Safety CPU modules R08/16/32/120SFCPU firmware versions \"26\" and prior and Mitsubishi Electric MELSEC iQ-R series SIL2 Process CPU modules R08/16/32/120PSFCPU firmware versions \"11\" and prior allows a remote unauthenticated attacker to login to the target unauthorizedly by sniffing network traffic and obtaining credentials when registering user information in the target or changing a 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":"primary","from":"nvd"},"epss":{"day":"2026-11-11","score":0.0222,"percentile":0.82907,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-522"],"published":"2021-08-06T00:00:00Z","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://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2021-009_en.pdf","tags":["x_transferred","Vendor Advisory"]},{"url":"https://jvn.jp/vu/JVNVU98578731/index.html","tags":["x_transferred","Third Party Advisory"]},{"url":"https://www.cisa.gov/uscert/ics/advisories/icsa-21-250-01","tags":["x_transferred"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-20597"},{"url":"https://github.com/advisories/GHSA-46vr-p4g8-f826"}],"sources":{"cve":[{"id":"CVE-2021-20597","description":"Insufficiently Protected Credentials vulnerability in Mitsubishi Electric MELSEC iQ-R series Safety CPU modules R08/16/32/120SFCPU firmware versions \"26\" and prior and Mitsubishi Electric MELSEC iQ-R series SIL2 Process CPU modules R08/16/32/120PSFCPU firmware versions \"11\" and prior allows a remote unauthenticated attacker to login to the target unauthorizedly by sniffing network traffic and obtaining credentials when registering user information in the target or changing a password.","status":"published","published":"2021-08-06T00:00:00Z","modified":"2024-08-03T17:45:44.727Z","updated_at":"2026-11-02T14:32:55.19484Z"}],"euvd":[{"id":"EUVD-2021-8015","description":"Insufficiently Protected Credentials vulnerability in Mitsubishi Electric MELSEC iQ-R series Safety CPU modules R08/16/32/120SFCPU firmware versions \"26\" and prior and Mitsubishi Electric MELSEC iQ-R series SIL2 Process CPU modules R08/16/32/120PSFCPU firmware versions \"11\" and prior allows a remote unauthenticated attacker to login to the target unauthorizedly by sniffing network traffic and obtaining credentials when registering user information in the target or changing a password.","status":"published","published":"2021-08-06T00:00:00Z","modified":"2024-08-03T17:45:44Z","updated_at":"2026-11-03T03:25:08.888273Z"}],"ghsa":[{"id":"GHSA-46vr-p4g8-f826","title":"Insufficiently Protected Credentials vulnerability in Mitsubishi Electric MELSEC iQ-R series CPU...","description":"Insufficiently Protected Credentials 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 login to the target unauthorizedly by sniffing network traffic and obtaining credentials when registering user information in the target or changing a password.","status":"published","published":"2022-05-24T19:10:16Z","modified":"2023-01-28T05:05:15Z","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"}],"cwes":["CWE-522"],"updated_at":"2026-11-02T14:44:19.055406Z"}],"nvd":[{"id":"CVE-2021-20597","description":"Insufficiently Protected Credentials vulnerability in Mitsubishi Electric MELSEC iQ-R series Safety CPU modules R08/16/32/120SFCPU firmware versions \"26\" and prior and Mitsubishi Electric MELSEC iQ-R series SIL2 Process CPU modules R08/16/32/120PSFCPU firmware versions \"11\" and prior allows a remote unauthenticated attacker to login to the target unauthorizedly by sniffing network traffic and obtaining credentials when registering user information in the target or changing a password.","status":"published","published":"2021-08-06T17:15:07.14Z","modified":"2026-06-17T03:34:05.54Z","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":"primary"},{"version":"2.0","score":6.4,"vector":"AV:N/AC:L/Au:N/C:P/I:P/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-522"],"updated_at":"2026-11-02T14:06:56.562207Z"}]}}