CVE-2020-5594

Name: CVE-2020-5594
Creator: NVD / NIST
Published: 2020-06-23T08:15:10.487+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 1.30%

Last modified Jun 17, 2026

CVE-2020-5594 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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.. EPSS estimates a 1.30% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

1.30%

66.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-319

Affected Software

Vendor	Product	Versions
Mitsubishielectric	Melsec Iq-R Firmware	All versions
Mitsubishielectric	Melsec Iq-F Firmware	All versions
Mitsubishielectric	Melsec-Q Firmware	All versions
Mitsubishielectric	Melsec-L Firmware	All versions
Mitsubishielectric	Melsec-Fx Firmware	All versions

References

https://jvn.jp/en/vu/JVNVU91424496/index.htmlThird Party Advisory
https://www.mitsubishielectric.co.jp/psirt/vulnerability/pdf/2020-003.pdfVendor Advisory
https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2020-003_en.pdfVendor Advisory
https://jvn.jp/en/vu/JVNVU91424496/index.htmlThird Party Advisory
https://www.mitsubishielectric.co.jp/psirt/vulnerability/pdf/2020-003.pdfVendor Advisory
https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2020-003_en.pdfVendor Advisory

Timeline

Published: Jun 23, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-5594?

How severe is CVE-2020-5594?

CVE-2020-5594 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 1.30% probability of exploitation in the next 30 days.

How do I fix CVE-2020-5594?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-5594?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST