CVE-2025-5241Network attack vector

Login denial via receiving-port account lockout

Published Jul 11, 2025 · Updated Jul 11, 2025

Account-lockout denial of service in Mitsubishi Electric MELSEC iQ-F Series allows remote attackers to block legitimate logins on all versions. Repeated incorrect-password requests cause the controller to lock communications on the receiving port until its lockout interval expires or it is reset. No authentication is required, and the bounded consequence is temporary loss of legitimate login access on the targeted port.

CVSS severity5.3
Medium
EPSS probability0.39%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Account-lockout denial of service in Mitsubishi Electric MELSEC iQ-F Series allows remote attackers to block legitimate logins on all versions. Repeated incorrect-password requests cause the controller to lock communications on the receiving port until its lockout interval expires or it is reset. No authentication is required, and the bounded consequence is temporary loss of legitimate login access on the targeted port.

The record

CVE
CVE-2025-5241
Published
Jul 11, 2025
Updated
Jul 11, 2025
Vendor
Mitsubishi Electric Corporation
Product
MELSEC iQ-F Series FX5UJ-60MR/ES-A
Classifications
CWE-645, T0814
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 11, 2025CVE publishedPublication date reported by the CVE source.
  2. Jul 11, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=All versions

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5UJ-60MR/ES-Aversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5S-30MR/DSversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5U-64MR/ESversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5S-60MT/ESversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5U-32MT/DSSversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5U-80MR/ESversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5S-40MT/ESversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5S-30MT/ESSversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5U-64MT/DSversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5UJ-60MT/DSSversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5U-32MT/ESSversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5S-60MR/ESversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5S-60MT/DSversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5S-40MR/DSversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5UC-32MT/Dversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5UJ-24MR/DSversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5UJ-40MT/DSSversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5U-64MT/DSSversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5S-60MT/DSSversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5UJ-60MR/ESversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5S-60MR/DSversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5-CCLGN-MSversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5U-80MT/ESSversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5U-32MR/DSversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5UJ-40MT/ESversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5S-60MT/ESSversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5UJ-60MT/DSversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5UJ-24MT/ESSversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5U-80MT/DSSversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5S-40MR/ESversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5U-80MT/ESversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5UC-32MT/DSSversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5U-32MR/ESversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5UJ-40MT/DSversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5U-64MT/ESSversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5UJ-60MT/ES-Aversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5U-32MT/ESversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5S-40MT/ESSversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5U-64MR/DSversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5S-30MT/DSversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5UJ-60MT/ESversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5S-30MT/ESversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5S-80MT/ESversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5UJ-24MR/ES-Aversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5UJ-24MT/DSversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5UC-64MT/Dversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5UC-32MR/DS-TSversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5UJ-24MT/ES-Aversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5UJ-40MR/ESversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5S-30MT/DSSversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5U-32MT/DSversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5U-80MT/DSversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5UJ-60MT/ESSversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5UC-64MT/DSSversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5UJ-24MT/DSSversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5UC-32MT/DS-TSversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5S-80MT/ESSversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5U-80MR/DSversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5UJ-40MR/ES-Aversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5UC-96MT/Dversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5U-64MT/ESversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5UJ-24MR/ESversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5S-40MT/DSSversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5S-40MT/DSversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5UJ-40MT/ESSversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5S-30MR/ESversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5UJ-40MR/DSversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5UJ-24MT/ESversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5UC-96MT/DSSversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5UJ-60MR/DSversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5UC-32MT/DSS-TSversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5UJ-40MT/ES-Aversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5S-80MR/ESversion=All versions

Published CVSS scores

5.3Mitsubishi Electric CorporationCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-645Overly Restrictive Account Lockout Mechanism
T0814Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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