Information Disclosure Vulnerability in MELSEC Series

published 2023-03-03 3 y ago modified 2026-06-17 4 mo ago also EUVD-2023-12511

cvss: 7.5; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 1.2%; EPSS 1.2% chance of exploitation in 30 days, percentile 67%
public exploits: 0; none known

Plaintext Storage of a Password vulnerability in Mitsubishi Electric Corporation MELSEC iQ-F Series, MELSEC iQ-R Series, MELSEC-Q Series and MELSEC-L Series allows a remote unauthenticated attacker to disclose plaintext credentials stored in project files and login into FTP server or Web server.

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

cisa ICSA-23-061-01 updated 2023-06-20 cvss 7.5

Mitsubishi Electric MELSEC iQ-F Series

Mitsubishi Electric All models FX5S CPU modules Mitsubishi Electric All models of FX5U(C) CPU modules Mitsubishi Electric All models of FX5UJ CPU modules Mitsubishi Electric FX5-ENET Mitsubishi Electric FX5-ENET/IP
affected: vendor fix mitsubishielectric.com

From CISA ICS and IT advisories (CSAF, https://github.com/cisagov/CSAF), a U.S. Government work; changed: reduced to products, statuses and remediations. CISA notification · csaf

CISA SSVC

Exploitation: none
Automatable: yes
Technical impact: partial
Assessed: 20 mo ago (2025-03-05)

Exploit prediction

1.17% chance of exploitation in the next 30 days, higher than 67% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
NVD	3.1	7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Affected products

Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-32MT/ES
Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-64MT/ES
Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-80MT/ES
Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-32MR/ES
Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-64MR/ES
Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-80MR/ES
Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-32MT/DS
Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-64MT/DS
Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-80MT/DS
Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-32MR/DS
Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-64MR/DS
Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-80MR/DS
Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-32MT/ESS
Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-64MT/ESS
Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-80MT/ESS
Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-32MT/DSS
Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-64MT/DSS
Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-80MT/DSS
Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UC-32MT/D
Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UC-64MT/D
Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UC-96MT/D
Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UC-32MT/DSS
Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UC-64MT/DSS
Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UC-96MT/DSS
Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UC-32MT/DS-TS
Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UC-32MT/DSS-TS
Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UC-32MR/DS-TS
Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UJ-24MT/ES
Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UJ-40MT/ES
Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UJ-60MT/ES
Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UJ-24MR/ES
Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UJ-40MR/ES
Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UJ-60MR/ES
Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UJ-24MT/ESS
Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UJ-40MT/ESS
Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UJ-60MT/ESS
Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UJ-24MT/ES-A
Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UJ-40MT/ES-A
Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UJ-60MT/ES-A
Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UJ-24MR/ES-A
Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UJ-40MR/ES-A
Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UJ-60MR/ES-A
Mitsubishi Electric Corporation MELSEC iQ-F Series FX5S-30MT/ES
Mitsubishi Electric Corporation MELSEC iQ-F Series FX5S-40MT/ES
Mitsubishi Electric Corporation MELSEC iQ-F Series FX5S-60MT/ES
Mitsubishi Electric Corporation MELSEC iQ-F Series FX5S-80MT/ES
Mitsubishi Electric Corporation MELSEC iQ-F Series FX5S-30MR/ES
Mitsubishi Electric Corporation MELSEC iQ-F Series FX5S-40MR/ES
Mitsubishi Electric Corporation MELSEC iQ-F Series FX5S-60MR/ES
Mitsubishi Electric Corporation MELSEC iQ-F Series FX5S-80MR/ES

Classification

Weakness

CWE-256 Plaintext Storage of a Password
CWE-522 Insufficiently Protected Credentials

References

mitsubishielectric.com /en/psirt/vulnerability/pdf/2022-023_en.pdf
vendor-advisory
jvn.jp /vu/JVNVU93891523/index.html
third-party-advisory
cisa.gov /news-events/ics-advisories/icsa-23-061-01
mitigation, third-party-advisory, us-government-resource

Sources

CVE List CVE-2023-0457
NVD CVE-2023-0457

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary