CVE-2020-5652: Mitsubishielectric Melsec Iq-r00cpu Firmware

High severity, CVSS 7.5. EPSS: 3.6% chance of exploitation in the next 30 days.

Uncontrolled resource consumption vulnerability in Ethernet Port on MELSEC iQ-R, Q and L series CPU modules (R 00/01/02 CPU firmware versions '20' and earlier, R 04/08/16/32/120 (EN) CPU firmware versions '52' and earlier, R 08/16/32/120 SFCPU firmware versions '22' and earlier, R 08/16/32/120 PCPU all versions, R 08/16/32/120 PSFCPU all versions, R 16/32/64 MTCPU all versions, Q03 UDECPU, Q 04/06/10/13/20/26/50/100 UDEHCPU serial number '22081' and earlier , Q 03/04/06/13/26 UDVCPU serial number '22031' and earlier, Q 04/06/13/26 UDPVCPU serial number '22031' and earlier, Q 172/173 DCPU all versions, Q 172/173 DSCPU all versions, Q 170 MCPU all versions, Q 170 MSCPU all versions, L 02/06/26 CPU (-P) and L 26 CPU - (P) BT all versions) allows a remote unauthenticated attacker to stop the Ethernet communication functions of the products via a specially crafted packet, which may lead to a denial of service (DoS) condition .

Affected products

• Mitsubishielectric Melsec Iq-r00cpu Firmware: version 20 only
• Mitsubishielectric Melsec Iq-r01cpu Firmware: version 20 only
• Mitsubishielectric Melsec Iq-r02cpu Firmware: version 20 only
• Mitsubishielectric Melsec Iq-r04encpu Firmware: version 52 only
• Mitsubishielectric Melsec Iq-r08encpu Firmware: version 52 only
• Mitsubishielectric Melsec Iq-r08pcpu Firmware: affected versions not specified
• Mitsubishielectric Melsec Iq-r08psfcpu Firmware: affected versions not specified
• Mitsubishielectric Melsec Iq-r08sfcpu Firmware: version 22 only
• Mitsubishielectric Melsec Iq-r120encpu Firmware: version 52 only
• Mitsubishielectric Melsec Iq-r120pcpu Firmware: affected versions not specified
• Mitsubishielectric Melsec Iq-r120psfcpu Firmware: affected versions not specified
• Mitsubishielectric Melsec Iq-r120sfcpu Firmware: version 22 only
• Mitsubishielectric Melsec Iq-r16encpu Firmware: version 52 only
• Mitsubishielectric Melsec Iq-r16mtcpu Firmware: affected versions not specified
• Mitsubishielectric Melsec Iq-r16pcpu Firmware: affected versions not specified
• Mitsubishielectric Melsec Iq-r16psfcpu Firmware: affected versions not specified
• Mitsubishielectric Melsec Iq-r16sfcpu Firmware: version 22 only
• Mitsubishielectric Melsec Iq-r32encpu Firmware: version 52 only
• Mitsubishielectric Melsec Iq-r32mtcpu Firmware: affected versions not specified
• Mitsubishielectric Melsec Iq-r32pcpu Firmware: affected versions not specified
• Mitsubishielectric Melsec Iq-r32psfcpu Firmware: affected versions not specified
• Mitsubishielectric Melsec Iq-r32sfcpu Firmware: version 22 only
• Mitsubishielectric Melsec Iq-r64mtcpu Firmware: affected versions not specified
• Mitsubishielectric Melsec l02cpu-P Firmware: affected versions not specified
• Mitsubishielectric Melsec l06cpu-P Firmware: affected versions not specified
• and 26 more

Published 2020-11-02. Last modified 2026-06-17.