CVE-2023-2846Network attack vector

Unauthenticated login via replayed authentication packets

Published Jun 30, 2023 · Updated Mar 5, 2025

Authentication bypass in Mitsubishi Electric MELSEC-F main modules allows remote attackers to log in via crafted network packets. The authentication exchange accepts captured messages when replayed, allowing the password or keyword setting to be canceled without proving knowledge of it. Affected models require an FX3U-ENET-ADP adapter or FX3U-ENET series Ethernet block, and exploitation permits unauthorized controller access.

CVSS severity7.5
High
EPSS probability1.32%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in Mitsubishi Electric MELSEC-F main modules allows remote attackers to log in via crafted network packets. The authentication exchange accepts captured messages when replayed, allowing the password or keyword setting to be canceled without proving knowledge of it. Affected models require an FX3U-ENET-ADP adapter or FX3U-ENET series Ethernet block, and exploitation permits unauthorized controller access.

The record

CVE
CVE-2023-2846
Published
Jun 30, 2023
Updated
Mar 5, 2025
Vendor
Mitsubishi Electric Corporation
Product
MELSEC-F Series FX3U-80MR/ES
Classifications
CWE-294, T0859
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 30, 2023CVE publishedPublication date reported by the CVE source.
  2. Mar 5, 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 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 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 FX3S-14MR/DSversion=all versions

Published CVSS scores

7.5Mitsubishi Electric CorporationCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
9.1NIST NVDCVSS: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-294Authentication Bypass by Capture-replay
T0859Valid Accounts

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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