What’s Vulnerable › Vulnerabilities

CVE-2020-5594

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2020-06-23 · updated 2026-06-17
• Weakness: CWE-319

Description

Mitsubishi Electric MELSEC iQ-R, iQ-F, Q, L, and FX series CPU modules all versions contain a vulnerability that allows cleartext transmission of sensitive information between CPU modules and GX Works3 and/or GX Works2 via unspecified vectors.

Affected products

• Mitsubishielectric Melsec-Fx Firmware: all versions
• Mitsubishielectric Melsec-L Firmware: all versions
• Mitsubishielectric Melsec-Q Firmware: all versions
• Mitsubishielectric Melsec Iq-F Firmware: all versions
• Mitsubishielectric Melsec Iq-R Firmware: all versions

References

• https://jvn.jp/en/vu/JVNVU91424496/index.html
• https://www.mitsubishielectric.co.jp/psirt/vulnerability/pdf/2020-003.pdf
• https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2020-003_en.pdf
• https://jvn.jp/en/vu/JVNVU91424496/index.html
• https://www.mitsubishielectric.co.jp/psirt/vulnerability/pdf/2020-003.pdf
• https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2020-003_en.pdf

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