Home/CVE/Overly Restrictive Account Lockout Mechanism vulnerability in Mitsubishi Electric MELSEC iQ-R series CPU modules (R08/16
CVE

CVE-2021-20598

Overly Restrictive Account Lockout Mechanism vulnerability in Mitsubishi Electric MELSEC iQ-R series CPU modules (R08/16

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.

MEDIUM · CVSS 5.3 EPSS 0.00473
Monitor
  • No active-exploitation, high-EPSS, or public-exploit signals - routine patching cadence
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-287Improper Authentication
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Affected Products & Versions

8
mitsubishielectric r08sfcpu firmwareall versions
mitsubishielectric r16sfcpu firmwareall versions
mitsubishielectric r32sfcpu firmwareall versions
mitsubishielectric r120sfcpu firmwareall versions
mitsubishielectric r08psfcpu firmwareall versions
mitsubishielectric r16psfcpu firmwareall versions
mitsubishielectric r32psfcpu firmwareall versions
mitsubishielectric r120psfcpu firmwareall versions
▣

Scoring & Timeline

5.3
MEDIUM · CVSS v3.1 · Mitsubishielectric.Psirt@yd.MitsubishiElectric.co.jp
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD06 Aug 2021 · 05:15 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
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Vendor Advisories

1
cisa-csafcisa-csaf-csaf_files-OT-white-2021-icsa-21-250-01
🔗

References & Sources

2
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://jvn.jp/vu/JVNVU98578731/index.htmlThird Party Advisory
https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2021-010_en.pdfVendor Advisory
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