What’s Vulnerable › Vulnerabilities

CVE-2020-5527

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2020-03-30 · updated 2026-06-17
• Weakness: CWE-400

Description

When MELSOFT transmission port (UDP/IP) of Mitsubishi Electric MELSEC iQ-R series (all versions), MELSEC iQ-F series (all versions), MELSEC Q series (all versions), MELSEC L series (all versions), and MELSEC F series (all versions) receives massive amount of data via unspecified vectors, resource consumption occurs and the port does not process the data properly. As a result, it may fall into a denial-of-service (DoS) condition. The vendor states this vulnerability only affects Ethernet communication functions.

Affected products

• Mitsubishielectric Cr800-Q Firmware: all versions
• Mitsubishielectric Fx3G Firmware: all versions
• Mitsubishielectric Fx3Gc Firmware: all versions
• Mitsubishielectric Fx3S Firmware: all versions
• Mitsubishielectric Fx3U Firmware: all versions
• Mitsubishielectric Fx3Uc Firmware: all versions
• Mitsubishielectric Fx5U Firmware: all versions
• Mitsubishielectric Fx5Uc Firmware: all versions
• Mitsubishielectric Fx5Uj Firmware: all versions
• Mitsubishielectric L02Cpu-P Firmware: all versions
• Mitsubishielectric L02Cpu Firmware: all versions
• Mitsubishielectric L02Scpu-P Firmware: all versions
• Mitsubishielectric L02Scpu Firmware: all versions
• Mitsubishielectric L06Cpu-P Firmware: all versions
• Mitsubishielectric L06Cpu Firmware: all versions
• Mitsubishielectric L26Cpu-Bt Firmware: all versions
• Mitsubishielectric L26Cpu-P Firmware: all versions
• Mitsubishielectric L26Cpu-Pbt Firmware: all versions
• Mitsubishielectric L26Cpu Firmware: all versions
• Mitsubishielectric Q02Phcpu Firmware: all versions
• Mitsubishielectric Q06Phcpu Firmware: all versions
• Mitsubishielectric Q12Dccpu-V Firmware: all versions
• Mitsubishielectric Q12Phcpu Firmware: all versions
• Mitsubishielectric Q12Prhcpu Firmware: all versions
• Mitsubishielectric Q172Dscpu Firmware: all versions
• Mitsubishielectric Q173Dscpu Firmware: all versions
• Mitsubishielectric Q173Nccpu Firmware: all versions
• Mitsubishielectric Q24Dhccpu-Ls Firmware: all versions
• Mitsubishielectric Q24Dhccpu-V Firmware: all versions
• Mitsubishielectric Q24Dhccpu-Vg2 Firmware: all versions

References

• https://jvn.jp/en/vu/JVNVU91553662/index.html
• https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2019-005_en.pdf
• https://jvn.jp/en/vu/JVNVU91553662/index.html
• https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2019-005_en.pdf

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