CVE-2020-5594
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.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (1.30%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 3.1
- 9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 1.30% probability · 70th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-319
- Affected
- mitsubishielectric/melsec iq-r firmware · mitsubishielectric/melsec iq-f firmware · mitsubishielectric/melsec-q firmware · mitsubishielectric/melsec-l firmware · mitsubishielectric/melsec-fx firmware
- Source
- vultures@jpcert.or.jp
EPSS 1.3% since 26 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
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
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.