CVE-2023-4625Network attack vector

Web login denial via repeated invalid attempts

Published Nov 6, 2023 · Updated Feb 27, 2025

Improper authentication-attempt restriction in Mitsubishi Electric MELSEC iQ-F/iQ-R CPU modules allows remote attackers to deny web logins. The Web server locks its login function for a period after repeated invalid authentication attempts, allowing continuous attempts to renew the lockout. No authentication is required, and the effect is limited to blocking legitimate Web server logins while the attempts continue.

CVSS severity5.3
Medium
EPSS probability0.95%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper authentication-attempt restriction in Mitsubishi Electric MELSEC iQ-F/iQ-R CPU modules allows remote attackers to deny web logins. The Web server locks its login function for a period after repeated invalid authentication attempts, allowing continuous attempts to renew the lockout. No authentication is required, and the effect is limited to blocking legitimate Web server logins while the attempts continue.

The record

CVE
CVE-2023-4625
Published
Nov 6, 2023
Updated
Feb 27, 2025
Vendor
Mitsubishi Electric Corporation
Product
MELSEC iQ-R Series R16ENCPU
Classifications
CWE-307, T0814
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 6, 2023CVE publishedPublication date reported by the CVE source.
  2. Feb 27, 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=versions 35 or later

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Mitsubishi Electric Corporation · MELSEC iQ-R Series R16ENCPUversion=versions 35 or later
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5UJ-60MR/ES-Aversion=all versions
Mitsubishi Electric Corporation · MELSEC iQ-R Series R32CPUversion=versions 35 or later
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5U-64MR/ESversion=1.060 or later (for serial number 179**** and prior); version=all versions (for serial number 17X**** and later)
Mitsubishi Electric Corporation · MELSEC iQ-R Series R16CPUversion=versions 35 or later
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5S-60MT/ESversion=all versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5U-32MT/DSSversion=1.060 or later (for serial number 179**** and prior); version=all versions (for serial number 17X**** and later)
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5U-80MR/ESversion=1.060 or later (for serial number 179**** and prior); version=all versions (for serial number 17X**** and later)
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-R Series R16PCPUversion=versions 37 or later
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5U-64MT/DSversion=1.060 or later (for serial number 179**** and prior); version=all versions (for serial number 17X**** and later)
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5UJ-60MT/DSSversion=all versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5U-32MT/ESSversion=1.060 or later (for serial number 179**** and prior); version=all versions (for serial number 17X**** and later)
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5S-60MR/ESversion=all versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5UC-32MT/Dversion=1.060 or later (for serial number 179**** and prior); version=all versions (for serial number 17X**** and later)
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=1.060 or later (for serial number 179**** and prior); version=all versions (for serial number 17X**** and later)
Mitsubishi Electric Corporation · MELSEC iQ-R Series R120PCPUversion=versions 37 or later
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5UJ-60MR/ESversion=all versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5U-80MT/ESSversion=1.060 or later (for serial number 179**** and prior); version=all versions (for serial number 17X**** and later)
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5U-32MR/DSversion=1.060 or later (for serial number 179**** and prior); version=all versions (for serial number 17X**** and later)
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5UJ-40MT/ESversion=all versions
Mitsubishi Electric Corporation · MELSEC iQ-R Series R32PCPUversion=versions 37 or later
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-R Series R00CPUversion=versions 05 or later
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5U-80MT/DSSversion=1.060 or later (for serial number 179**** and prior); version=all versions (for serial number 17X**** and later)
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5S-40MR/ESversion=all versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5U-80MT/ESversion=1.060 or later (for serial number 179**** and prior); version=all versions (for serial number 17X**** and later)
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5UC-32MT/DSSversion=1.060 or later (for serial number 179**** and prior); version=all versions (for serial number 17X**** and later)
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5U-32MR/ESversion=1.060 or later (for serial number 179**** and prior); version=all versions (for serial number 17X**** and later)
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5UJ-40MT/DSversion=all versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5U-64MT/ESSversion=1.060 or later (for serial number 179**** and prior); version=all versions (for serial number 17X**** and later)
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5UJ-60MT/ES-Aversion=all versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5U-32MT/ESversion=1.060 or later (for serial number 179**** and prior); version=all versions (for serial number 17X**** and later)
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5S-40MT/ESSversion=all versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5U-64MR/DSversion=1.060 or later (for serial number 179**** and prior); version=all versions (for serial number 17X**** and later)
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5UJ-60MT/ESversion=all versions
Mitsubishi Electric Corporation · MELSEC iQ-R Series R04ENCPUversion=versions 35 or later
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-R Series R08ENCPUversion=versions 35 or later
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5UC-64MT/Dversion=1.060 or later (for serial number 179**** and prior); version=all versions (for serial number 17X**** and later)
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5UC-32MR/DS-TSversion=all versions
Mitsubishi Electric Corporation · MELSEC iQ-R Series R32ENCPUversion=versions 35 or later
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-R Series R08CPUversion=versions 35 or later
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5U-32MT/DSversion=1.060 or later (for serial number 179**** and prior); version=all versions (for serial number 17X**** and later)
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5U-80MT/DSversion=1.060 or later (for serial number 179**** and prior); version=all versions (for serial number 17X**** and later)
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5UJ-60MT/ESSversion=all versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5UC-64MT/DSSversion=1.060 or later (for serial number 179**** and prior); version=all versions (for serial number 17X**** and later)
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5UJ-24MT/DSSversion=all versions
Mitsubishi Electric Corporation · MELSEC iQ-R Series R04CPUversion=versions 35 or later
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=1.060 or later (for serial number 179**** and prior); version=all versions (for serial number 17X**** and later)
Mitsubishi Electric Corporation · MELSEC iQ-R Series R08PCPUversion=versions 37 or later
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5UJ-40MR/ES-Aversion=all versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5UC-96MT/Dversion=1.060 or later (for serial number 179**** and prior); version=all versions (for serial number 17X**** and later)
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5U-64MT/ESversion=1.060 or later (for serial number 179**** and prior); version=all versions (for serial number 17X**** and later)
Mitsubishi Electric Corporation · MELSEC iQ-R Series R01CPUversion=versions 05 or later
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5UJ-24MR/ESversion=all versions
Mitsubishi Electric Corporation · MELSEC iQ-R Series R120ENCPUversion=versions 35 or later
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=1.060 or later (for serial number 179**** and prior); version=all versions (for serial number 17X**** and later)
Mitsubishi Electric Corporation · MELSEC iQ-R Series R02CPUversion=versions 05 or later
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
Mitsubishi Electric Corporation · MELSEC iQ-R Series R120CPUversion=versions 35 or later

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-307Improper Restriction of Excessive Authentication Attempts
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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