CVE-2021-20609: Mitsubishi Melipc MI5122-Vw Firmware
High severity, CVSS 7.5. EPSS: 3.3% chance of exploitation in the next 30 days.
Uncontrolled Resource Consumption vulnerability in Mitsubishi Electric MELSEC iQ-R Series R00/01/02CPU, MELSEC iQ-R Series R04/08/16/32/120(EN)CPU, MELSEC iQ-R Series R08/16/32/120SFCPU, MELSEC iQ-R Series R08/16/32/120PCPU, MELSEC iQ-R Series R08/16/32/120PSFCPU, MELSEC iQ-R Series R16/32/64MTCPU, MELSEC iQ-R Series R12CCPU-V, MELSEC Q Series Q03UDECPU, MELSEC Q Series Q04/06/10/13/20/26/50/100UDEHCPU, MELSEC Q Series Q03/04/06/13/26UDVCPU, MELSEC Q Series Q04/06/13/26UDPVCPU, MELSEC Q Series Q12DCCPU-V, MELSEC Q Series Q24DHCCPU-V(G), MELSEC Q Series Q24/26DHCCPU-LS, MELSEC Q Series MR-MQ100, MELSEC Q Series Q172/173DCPU-S1, MELSEC Q Series Q172/173DSCPU, MELSEC Q Series Q170MCPU, MELSEC Q Series Q170MSCPU(-S1), MELSEC L Series L02/06/26CPU(-P), MELSEC L Series L26CPU-(P)BT and MELIPC Series MI5122-VW allows a remote unauthenticated attacker to cause a denial-of-service (DoS) condition by sending specially crafted packets. System reset is required for recovery.
Affected products
- Mitsubishi Melipc MI5122-Vw Firmware: any version
- Mitsubishi Melsec Iq-R r00 CPU Firmware: up to and including 24
- Mitsubishi Melsec Iq-R r01 CPU Firmware: up to and including 24
- Mitsubishi Melsec Iq-R r02 CPU Firmware: up to and including 24
- Mitsubishi Melsec Iq-R r04 CPU Firmware: up to and including 57
- Mitsubishi Melsec Iq-R r04 Pcpu Firmware: up to and including 29
- Mitsubishi Melsec Iq-R r08 CPU Firmware: up to and including 57; any version
- Mitsubishi Melsec Iq-R r08 Pcpu Firmware: up to and including 29
- Mitsubishi Melsec Iq-R r08 Sfcpu Firmware: any version
- Mitsubishi Melsec Iq-R r120 CPU Firmware: up to and including 57; any version
- Mitsubishi Melsec Iq-R r120 Pcpu Firmware: up to and including 29
- Mitsubishi Melsec Iq-R r120 Sfcpu Firmware: any version
- Mitsubishi Melsec Iq-R r12 Ccpu-V Firmware: any version
- Mitsubishi Melsec Iq-R r16 CPU Firmware: up to and including 57; any version
- Mitsubishi Melsec Iq-R r16 Mtcpu Firmware: any version
- Mitsubishi Melsec Iq-R r16 Pcpu Firmware: up to and including 29
- Mitsubishi Melsec Iq-R r16 Sfcpu Firmware: any version
- Mitsubishi Melsec Iq-R r32 CPU Firmware: up to and including 57; any version
- Mitsubishi Melsec Iq-R r32 Mtcpu Firmware: any version
- Mitsubishi Melsec Iq-R r32 Pcpu Firmware: up to and including 29
- Mitsubishi Melsec Iq-R r32 Sfcpu Firmware: any version
- Mitsubishi Melsec Iq-R r64 Mtcpu Firmware: any version
- Mitsubishi Melsec l02cpu(-P) Firmware: any version
- Mitsubishi Melsec l06cpu(-P) Firmware: any version
- Mitsubishi Melsec l26cpu(-P) Firmware: any version
- and 30 more
Published 2021-12-01. Last modified 2026-06-17.