What’s Vulnerable › Vulnerabilities

CVE-2021-20598

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-08-06 · updated 2026-06-17
• Weakness: CWE-287

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.

Affected products

• Mitsubishielectric R08Psfcpu Firmware: all versions
• Mitsubishielectric R08Sfcpu Firmware: all versions
• Mitsubishielectric R120Psfcpu Firmware: all versions
• Mitsubishielectric R120Sfcpu Firmware: all versions
• Mitsubishielectric R16Psfcpu Firmware: all versions
• Mitsubishielectric R16Sfcpu Firmware: all versions
• Mitsubishielectric R32Psfcpu Firmware: all versions
• Mitsubishielectric R32Sfcpu Firmware: all versions

References

• https://jvn.jp/vu/JVNVU98578731/index.html
• https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2021-010_en.pdf
• https://jvn.jp/vu/JVNVU98578731/index.html
• https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2021-010_en.pdf

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