CVE-2021-20599: Mitsubishielectric r08psfcpu Firmware

High severity, CVSS 7.5. EPSS: 1.4% chance of exploitation in the next 30 days.

Cleartext Transmission of Sensitive InformationCleartext transmission of sensitive information vulnerability in MELSEC iQ-R series Safety CPU R08/16/32/120SFCPU firmware versions "26" and prior and MELSEC iQ-R series SIL2 Process CPU R08/16/32/120PSFCPU firmware versions "11" and prior allows a remote unauthenticated attacker to login to a target CPU module by obtaining credentials other than 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 2021-10-14. Last modified 2026-06-17.