{"cve":"CVE-2021-20597","nvd":{"published":"2021-08-06T17:15:07.140","modified":"2026-06-17T03:34:05.540","status":"Modified","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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","score":9.1},"cwes":["CWE-522"],"references":["https://jvn.jp/vu/JVNVU98578731/index.html","https://www.cisa.gov/uscert/ics/advisories/icsa-21-250-01","https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2021-009_en.pdf","https://jvn.jp/vu/JVNVU98578731/index.html","https://www.cisa.gov/uscert/ics/advisories/icsa-21-250-01"],"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-2021-20597","score":0.0222,"percentile":0.82677,"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."]}