CVE-2023-4562Network attack vector

Sequence-program theft and tampering via unauthenticated messages

Published Oct 13, 2023 · Updated Feb 27, 2025

Improper authentication in Mitsubishi Electric MELSEC-F main modules allows remote attackers to read or alter sequence programs. Eight-digit keyword handling lacks authentication, while sixteen-digit keyword handling improperly authenticates illegitimate network messages. Network access to the controller is required, and many listed models are exposed only when used with the specified Ethernet adapter or block.

CVSS severity9.1
Critical
EPSS probability0.85%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper authentication in Mitsubishi Electric MELSEC-F main modules allows remote attackers to read or alter sequence programs. Eight-digit keyword handling lacks authentication, while sixteen-digit keyword handling improperly authenticates illegitimate network messages. Network access to the controller is required, and many listed models are exposed only when used with the specified Ethernet adapter or block.

The record

CVE
CVE-2023-4562
Published
Oct 13, 2023
Updated
Feb 27, 2025
Vendor
Mitsubishi Electric Corporation
Product
MELSEC-F Series FX3U-80MR/ES
Classifications
CWE-287, T0889
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 13, 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=all versions

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Mitsubishi Electric Corporation · MELSEC-F Series FX3U-80MR/ESversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3U-80MR/ES-Aversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3U-32MR/UA1version=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3S-20MT/DSversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3U-32MT/ESversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3U-80MT/ESSversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3U-64MT/ES-Aversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3G-14MT/ES-Aversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3S-20MR/DSversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3GE-24MR/DSversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3S-20MT/ESversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3SA-30MT-CMversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3UC-96MT/Dversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3GE-24MT/ESSversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3S-14MR/ESversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3GE-24MT/DSversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3G-14MR/DSversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3G-24MR/DSversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3G-40MT/ESversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3UC-16MR/DS-Tversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3S-30MT/DSversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3GA-24MR-CMversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3U-16MT/ESversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3U-80MT/DSSversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3S-30MR/DSversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3G-60MT/DSversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3S-30MT/ES-2ADversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3GE-40MT/DSversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3U-64MR/ES-Aversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3S-20MR/ESversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3SA-14MT-CMversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3G-24MT/DSversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3GA-60MT-CMversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3U-48MT/DSversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3G-40MR/ES-Aversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3U-80MT/DSversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3U-128MR/DSversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3S-20MT/ESSversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3UC-16MT/D-P4version=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3G-60MR/DSversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3GA-40MR-CMversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3G-24MT/DSSversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3U-48MT/DSSversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3G-14MT/DSversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3U-128MR/ESversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3U-48MT/ES-Aversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3S-10MT/DSSversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3U-16MR/DSversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3S-10MT/ESSversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3U-48MT/ESSversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3GE-24MT/DSSversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3G-14MT/DSSversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3G-40MT/ES-Aversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3GE-40MT/DSSversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3UC-16MT/DSSversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3U-128MT/ES-Aversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3G-24MT/ESSversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3S-30MR/ESversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3U-128MT/DSversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3G-14MT/ESSversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3U-48MT/ESversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3U-64MR/ESversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3U-128MT/ESversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3SA-20MT-CMversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3GE-40MT/ESSversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3U-16MT/DSversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3GE-40MR/DSversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3GA-24MT-CMversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3UC-16MR/D-Tversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3UC-16MT/DSS-P4version=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3G-14MR/ES-Aversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3G-40MT/DSversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3G-60MT/ESversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3U-128MT/ESSversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3G-14MT/ESversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3U-80MT/ES-Aversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3GE-40MT/ESversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3U-32MR/ES-Aversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3U-32MT/ES-Aversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3U-16MT/ES-Aversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3S-30MR/ES-2ADversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3S-30MT/ESSversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3U-32MT/ESSversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3G-24MR/ES-Aversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3U-48MR/ES-Aversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3S-30MT/ESS-2ADversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3SA-14MR-CMversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3S-10MT/DSversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3UC-64MT/Dversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3U-32MT/DSSversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3U-48MR/ESversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3G-24MT/ES-Aversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3G-24MR/ESversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3G-40MT/ESSversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3U-16MT/ESSversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3S-10MR/ESversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3U-128MR/ES-Aversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3U-64MS/ESversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3SA-20MR-CMversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3GE-24MT/ESversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3G-60MT/ES-Aversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3U-80MR/DSversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3G-60MR/ESversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3G-60MT/DSSversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3U-64MT/DSversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3SA-30MR-CMversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3U-80MT/ESversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3U-16MR/ESversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3U-16MR/ES-Aversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3S-14MT/ESSversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3G-60MT/ESSversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3S-14MT/DSversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3U-32MR/ESversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3UC-16MT/Dversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3G-40MT/DSSversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3UC-32MT/DSSversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3UC-96MT/DSSversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3SA-10MT-CMversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3S-14MT/ESversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3G-24MT/ESversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3U-64MT/ESSversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3U-64MT/DSSversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3GA-60MR-CMversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3S-20MT/DSSversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3U-32MR/DSversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3S-10MR/DSversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3GE-40MR/ESversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3G-60MR/ES-Aversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3S-10MT/ESversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3S-30MT/DSSversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3U-16MT/DSSversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3UC-32MT-LTversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3S-30MT/ESversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3GE-24MR/ESversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3S-14MT/DSSversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3UC-64MT/DSSversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3U-64MR/DSversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3U-32MS/ESversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3UC-32MT-LT-2version=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3SA-10MR-CMversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3U-32MT/DSversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3UC-32MT/Dversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3GA-40MT-CMversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3G-40MR/DSversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3U-64MR/UA1version=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3U-64MT/ESversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3G-14MR/ESversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3GC-32MT/Dversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3U-48MR/DSversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3G-40MR/ESversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3GC-32MT/DSSversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3U-128MT/DSSversion=all versions
Mitsubishi Electric Corporation · MELSEC-F Series FX3S-14MR/DSversion=all versions

Published CVSS scores

9.1Mitsubishi Electric CorporationCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

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-287Improper Authentication
T0889Modify Program

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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