CVE-2021-20594: Mitsubishielectric r08psfcpu Firmware

High severity, CVSS 7.5. EPSS: 2.4% chance of exploitation in the next 30 days.

Exposure of Sensitive Information to an Unauthorized Actor 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 acquire legitimate user names registered in the module via brute-force attack on user names.

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.