CVE-2020-13238: Mitsubishielectric Melsec Iq-r00cpu Firmware

High severity, CVSS 7.5. EPSS: 3.3% chance of exploitation in the next 30 days.

Mitsubishi MELSEC iQ-R Series PLCs with firmware 33 allow attackers to halt the industrial process by sending an unauthenticated crafted packet over the network, because this denial of service attack consumes excessive CPU time. After halting, physical access to the PLC is required in order to restore production.

Affected products

• Mitsubishielectric Melsec Iq-r00cpu Firmware: up to and including 7
• Mitsubishielectric Melsec Iq-r01cpu Firmware: up to and including 7
• Mitsubishielectric Melsec Iq-r02cpu Firmware: up to and including 7
• Mitsubishielectric Melsec Iq-r04cpu Firmware: up to and including 39
• Mitsubishielectric Melsec Iq-r08cpu Firmware: up to and including 39
• Mitsubishielectric Melsec Iq-r08fcpu Firmware: up to and including 20
• Mitsubishielectric Melsec Iq-r08pcpu Firmware: any version
• Mitsubishielectric Melsec Iq-r08sfcpu Firmware: any version
• Mitsubishielectric Melsec Iq-r120cpu Firmware: up to and including 39
• Mitsubishielectric Melsec Iq-r120fcpu Firmware: up to and including 20
• Mitsubishielectric Melsec Iq-r120pcpu Firmware: any version
• Mitsubishielectric Melsec Iq-r120sfcpu Firmware: any version
• Mitsubishielectric Melsec Iq-r16cpu Firmware: up to and including 39
• Mitsubishielectric Melsec Iq-r16fcpu Firmware: up to and including 20
• Mitsubishielectric Melsec Iq-r16pcpu Firmware: any version
• Mitsubishielectric Melsec Iq-r16sfcpu Firmware: any version
• Mitsubishielectric Melsec Iq-r32cpu Firmware: up to and including 39
• Mitsubishielectric Melsec Iq-r32fcpu Firmware: up to and including 20
• Mitsubishielectric Melsec Iq-r32pcpu Firmware: any version
• Mitsubishielectric Melsec Iq-r32sfcpu Firmware: any version
• Mitsubishielectric Melsec Iq-RJ71EN71 Firmware: any version

Published 2020-06-10. Last modified 2026-06-17.