CVE-2021-20598: Mitsubishielectric r08psfcpu Firmware

Medium severity, CVSS 5.3. EPSS: 1.5% chance of exploitation in the next 30 days.

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: any version
• Mitsubishielectric r08sfcpu Firmware: any version
• Mitsubishielectric r120psfcpu Firmware: any version
• Mitsubishielectric r120sfcpu Firmware: any version
• Mitsubishielectric r16psfcpu Firmware: any version
• Mitsubishielectric r16sfcpu Firmware: any version
• Mitsubishielectric r32psfcpu Firmware: any version
• Mitsubishielectric r32sfcpu Firmware: any version

Published 2021-08-06. Last modified 2026-06-17.