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High severity7.5NVD Advisory· Published Dec 1, 2021· Updated Jun 17, 2026

CVE-2021-20611

CVE-2021-20611

Description

Improper Input Validation 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.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

72
  • Mitsubishielectric/MELSEC L Series L02/06/26CPU(-P)llm-create
  • Mitsubishielectric/MELSEC iQ-R Series R00/01/02CPU Firmwarellm-fuzzy
  • Mitsubishielectric/MELSEC-Q Series Q03UDVCPUllm-fuzzy18 versions
    (expand)+ 17 more
    • (no CPE)
    • (no CPE)range: The first 5 digits of serial No. "23121" and prior
    • (no CPE)range: The first 5 digits of serial No. "23071" and prior
    • (no CPE)range: The first 5 digits of serial No. "23121" and prior
    • (no CPE)range: The first 5 digits of serial No. "23071" and prior
    • (no CPE)range: The first 5 digits of serial No. "23071" and prior
    • (no CPE)range: The first 5 digits of serial No. "23121" and prior
    • (no CPE)range: The first 5 digits of serial No. "23071" and prior
    • (no CPE)range: The first 5 digits of serial No. "23071" and prior
    • (no CPE)range: The first 5 digits of serial No. "23121" and prior
    • (no CPE)range: The first 5 digits of serial No. "23071" and prior
    • (no CPE)range: The first 5 digits of serial No. "23071" and prior
    • (no CPE)range: Operating system software version "W" and prior
    • (no CPE)range: Operating system software version "Y" and prior
    • (no CPE)range: Operating system software version "Y" and prior
    • (no CPE)range: Operating system software version "Y" and prior
    • (no CPE)range: The first 5 digits of serial No. "23071" and prior
    • (no CPE)range: The first 5 digits of serial No. "23071" and prior
  • Mitsubishielectric/MELIPC Series MI5122-VWcpe-rescue
    Range: Firmware versions "05" and prior
  • Mitsubishielectric/MELSEC iQ-R Seriescpe-rescue29 versions
    Firmware versions "24" and prior+ 28 more
    • (no CPE)range: Firmware versions "24" and prior
    • (no CPE)range: Firmware versions "24" and prior
    • (no CPE)range: Firmware versions "24" and prior
    • (no CPE)range: Firmware versions "57" and prior
    • (no CPE)range: Firmware versions "57" and prior
    • (no CPE)range: Firmware versions "57" and prior
    • (no CPE)range: Firmware versions "57" and prior
    • (no CPE)range: Firmware versions "29" and prior
    • (no CPE)range: Firmware versions "08" and prior
    • (no CPE)range: Firmware versions "26" and prior
    • (no CPE)range: Firmware versions "57" and prior
    • (no CPE)range: Firmware versions "57" and prior
    • (no CPE)range: Firmware versions "29" and prior
    • (no CPE)range: Firmware versions "08" and prior
    • (no CPE)range: Firmware versions "26" and prior
    • (no CPE)range: Firmware versions "16" and prior
    • (no CPE)range: Firmware versions "57" and prior
    • (no CPE)range: Firmware versions "57" and prior
    • (no CPE)range: Operating system software version "23" and prior
    • (no CPE)range: Firmware versions "29" and prior
    • (no CPE)range: Firmware versions "08" and prior
    • (no CPE)range: Firmware versions "26" and prior
    • (no CPE)range: Firmware versions "57" and prior
    • (no CPE)range: Firmware versions "57" and prior
    • (no CPE)range: Operating system software version "23" and prior
    • (no CPE)range: Firmware versions "29" and prior
    • (no CPE)range: Firmware versions "08" and prior
    • (no CPE)range: Firmware versions "26" and prior
    • (no CPE)range: Operating system software version "23" and prior
  • Mitsubishielectric/MELSEC-Q Seriescpe-rescue17 versions
    The first 5 digits of serial No. "23121" and prior+ 16 more
    • (no CPE)range: The first 5 digits of serial No. "23121" and prior
    • (no CPE)range: The first 5 digits of serial No. "23121" and prior
    • (no CPE)range: The first 5 digits of serial No. "23121" and prior
    • (no CPE)range: Operating system software version "F" and prior
    • (no CPE)range: The first 5 digits of serial No. "23121" and prior
    • (no CPE)range: The first 5 digits of serial No. "23121" and prior
    • (no CPE)range: The first 5 digits of serial No. "24031" and prior
    • (no CPE)range: Operating system software version "Y" and prior
    • (no CPE)range: Operating system software version "W" and prior
    • (no CPE)range: Operating system software version "W" and prior
    • (no CPE)range: The first 5 digits of serial No. "23121" and prior
    • (no CPE)range: The first 5 digits of serial No. "24031" and prior
    • (no CPE)range: The first 5 digits of serial No. "24031" and prior
    • (no CPE)range: The first 5 digits of serial No. "24031" and prior
    • (no CPE)range: The first 5 digits of serial No. "24031" and prior
    • (no CPE)range: The first 5 digits of serial No. "23121" and prior
    • (no CPE)range: The first 5 digits of serial No. "23121" and prior
  • Mitsubishi Electric Corporation/MELSEC L Series L02CPU-Pv5
    Range: The first 5 digits of serial No. "23121" and prior
  • Mitsubishi Electric Corporation/MELSEC L Series L06CPU-Pv5
    Range: The first 5 digits of serial No. "23121" and prior
  • Mitsubishi Electric Corporation/MELSEC L Series L26CPU-BTv5
    Range: The first 5 digits of serial No. "23121" and prior
  • Mitsubishi Electric Corporation/MELSEC L Series L26CPU-Pv5
    Range: The first 5 digits of serial No. "23121" and prior
  • Mitsubishi Electric Corporation/MELSEC L Series L26CPU-PBTv5
    Range: The first 5 digits of serial No. "23121" and prior

Patches

Vulnerability mechanics

References

3

News mentions

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