HighCVE-2023-6942

    Mitsubishi Electric EZSocket: Missing Authentication for Critical Function (CVE-2023-6942)

    Published Sources: CISA ICS, CVE.org

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    What is affected, what to do

    Missing Authentication for Critical Function vulnerability in Mitsubishi Electric Corporation EZSocket versions 3.0 to 5.92, GT Designer3 Version1(GOT1000) versions 1.325P and prior, GT Designer3 Version1(GOT2000) versions 1.320J and prior, GX Works2 versions 1.11M to 1.626C, GX Works3 versions 1.106L and prior, MELSOFT Navigator versions 1.04E to 2.102G, MT Works2 versions 1.190Y and prior, MX Component versions 4.00A to 5.007H and MX OPC Server DA/UA all versions allows a remote unauthenticated attacker to bypass authentication by sending specially crafted packets and connect to the products illegally.

    The available sources name no fixed version. Check the vendor guidance in the references below.

    Affected
    • Mitsubishi Electric EZSocket eq 3.0 to 5.92..3.0 to 5.92
    • Mitsubishi Electric GT Designer3 Version1 (GOT1000) eq 1.325P and prior..1.325P and prior
    • Mitsubishi Electric GT Designer3 Version1 (GOT2000) eq 1.320J and prior..1.320J and prior
    • Mitsubishi Electric GX Works2 eq 1.11M to 1.626C..1.11M to 1.626C
    • Mitsubishi Electric GX Works3 eq 1.106L and prior..1.106L and prior
    • Mitsubishi Electric MELSOFT Navigator eq 1.04E to 2.102G..1.04E to 2.102G
    • Mitsubishi Electric MT Works2 eq 1.190Y and prior..1.190Y and prior
    • Mitsubishi Electric MX Component eq 4.00A to 5.007H..4.00A to 5.007H
    • Mitsubishi Electric MX OPC Server DA/UA eq all versions..all versions

    Not sure whether and how you are affected? Ask a question about this vulnerability

    Metrics

    7.5

    Priority

    XIEM Effective CVSS: highest available CVSS rating from NVD and vendor data.

    Source: NVD, CVSS v3

    7.5

    CVSS v3

    Severity High on the scale from 0 to 10.

    Source: CISA ICS, CVE.org

    1.0 %

    EPSS score

    Low — model estimates < 1% exploitation likelihood.

    Source: FIRST EPSS, percentile 61.2

    Show all metrics
    Severity
    High
    Priority (0–325)

    The priority score is a consolidated metric that condenses several individual signals into a single, action-guiding ranking: technical severity (CVSS), exploitation likelihood (EPSS), known-exploited status (KEV) and the context of the affected asset. The aim is to answer the only truly important question in vulnerability management: what first?

    Read in glossary
    71.84 Methodology
    Exploit maturity

    An exploit is code or a technique that specifically uses a concrete vulnerability to force unintended behaviour — such as executing code or escalating privileges. It is the tool that turns a theoretical flaw into a practical attack.

    Read in glossary
    no public PoC known
    XIEM Effective CVSS

    XIEM® is the tiered managed-security operating model from NEOSEC and a registered trademark of NEOSEC GmbH. It extends classic SIEM — the central collection, normalisation and correlation of security-relevant events — with endpoint forensics, network visibility and deception technology, and consolidates them into three building tiers: Sentry, Orchestrate and Command.

    Read in glossary
    7.5 Methodology
    CVSS v3

    CVSS is the globally established, open standard for assessing the technical severity of a vulnerability on a scale from 0 to 10. It describes how easily a flaw can be exploited and what damage it can cause — but not how likely its actual exploitation is. CVSS and the complementary EPSS deliberately answer different questions.

    Read in glossary
    7.5
    EPSS score

    The EPSS score is the absolute model output for an individual vulnerability: the estimated probability of real-world exploitation within the next 30 days, expressed as a value between 0 and 1 (i.e. 0 % to 100 %). A score of 0.42 means „the model estimates a 42 % chance of real-world exploitation within 30 days“.

    Read in glossary
    1.0 %
    Low — model estimates < 1% exploitation likelihood.
    EPSS percentile

    The EPSS percentile is the relative position of a vulnerability within all EPSS-scored CVEs, expressed as a value between 0 and 1. A percentile of 0.90 means „this CVE has a higher EPSS score than 90 % of all other scored CVEs“. Unlike the EPSS score, it is not a probability — but a positioning within a ranking.

    Read in glossary
    61.2
    High — this CVE ranks above the median of all CVEs scored today (rank ≥ 36%).
    KEV status

    The KEV catalogue is a list maintained by the US authority CISA of vulnerabilities for which active exploitation in the wild has been confirmed. It answers not the question „how severe?“ but „is it already being attacked?“ — thereby sharply prioritising patching.

    Read in glossary
    —
    Published
    CISA assessment (SSVC)
    Exploitation: none known · automatable · Technical impact: partial
    Source: CISA Vulnrichment, as of 8 May 2025
    CWE

    CWE is a catalogue of typical weakness types in software and hardware — such as flawed input validation, unsafe memory handling or poor authentication. Where a CVE names a concrete vulnerability in a concrete product, a CWE describes the underlying class of defect.

    Read in glossary
    CWE-306

    Detection rules

    No NEOSEC detection rule is available for this vulnerability yet.

    Classification under NIS2 and CRA

    Rule-based classification from exploitation status and severity. It does not replace a case-by-case assessment.

    NIS2

    NIS2 is EU Directive (EU) 2022/2555 to raise the level of cybersecurity across the Union. It substantially broadens obligations compared with the first NIS directive: more sectors, mandatory risk management, staged reporting duties and personal accountability of senior management.

    Read in glossary
    High technical severity: assess and remediate the vulnerability in vulnerability handling under Art. 21(2)(e) NIS2 and document the decision.
    CRA

    The CRA is EU Regulation (EU) 2024/2847 setting horizontal cybersecurity requirements for „products with digital elements“ — from industrial controllers and software to connected consumer devices. For the first time manufacturers must ensure security across the entire product lifecycle, handle vulnerabilities and provide security updates.

    Read in glossary
    From 11.12.2027, Annex I Part II CRA requires manufacturers of affected products with digital elements to handle vulnerabilities without delay and provide security updates.
    ISO/IEC 27001

    ISO/IEC 27001 is the internationally leading standard for an information security management system (ISMS). It describes a risk-based, process-oriented framework to systematically plan, implement, review and improve information security.

    Read in glossary
    Control A.8.8, management of technical vulnerabilities: assess relevance to your systems, plan remediation and keep evidence.

    Description

    Missing Authentication for Critical Function vulnerability in Mitsubishi Electric Corporation EZSocket versions 3.0 to 5.92, GT Designer3 Version1(GOT1000) versions 1.325P and prior, GT Designer3 Version1(GOT2000) versions 1.320J and prior, GX Works2 versions 1.11M to 1.626C, GX Works3 versions 1.106L and prior, MELSOFT Navigator versions 1.04E to 2.102G, MT Works2 versions 1.190Y and prior, MX Component versions 4.00A to 5.007H and MX OPC Server DA/UA all versions allows a remote unauthenticated attacker to bypass authentication by sending specially crafted packets and connect to the products illegally.

    Source: cisa_ics_advisory, NVD (NIST), cvelistv5

    Affected products

    The following versions are affected. Older releases of the same product line are also vulnerable unless stated otherwise.

    Affected products
    Affected versionsFixed in
    Mitsubishi Electric CorporationEZSocket
    • 3.0 to 5.92
    • —
    Mitsubishi Electric CorporationGT Designer3 Version1(GOT1000)
    • 1.325P and prior
    • —
    Mitsubishi Electric CorporationGT Designer3 Version1(GOT2000)
    • 1.320J and prior
    • —
    Mitsubishi Electric CorporationGX Works2
    • 1.11M to 1.626C
    • —
    Mitsubishi Electric CorporationGX Works3
    • 1.106L and prior
    • —
    Mitsubishi Electric CorporationMELSOFT Navigator
    • 1.04E to 2.102G
    • —
    Mitsubishi Electric CorporationMT Works2
    • 1.190Y and prior
    • —
    Mitsubishi Electric CorporationMX Component
    • 4.00A to 5.007H
    • —
    Mitsubishi Electric CorporationMX OPC Server DA/UA
    • all versions
    • —
    mitsubishielectricezsocket
    • ≥ 3.0
    • —
    mitsubishielectricfr_configurator2
    • —
    • —
    mitsubishielectricgot1000
    • —
    • —
    mitsubishielectricgot2000
    • —
    • —
    mitsubishielectricgx_works2
    • ≥ 1.11m
    • —
    mitsubishielectricgx_works3
    • —
    • —
    mitsubishielectricmc_works64
    • —
    • —
    mitsubishielectricmelsoft_navigator
    • ≥ 1.04e
    • —
    mitsubishielectricmt_works2
    • —
    • —
    mitsubishielectricmx_component
    • ≥ 4.00a
    • —

    Vendors and products

    Weakness classes (CWE)

    • CWE-306Missing Authentication for Critical Function

      Base

      The product does not perform any authentication for functionality that requires a provable user identity or consumes a significant amount of resources.

      Entry at MITRE CWE-306

    References & sources

    • mitsubishielectric.comen/psirt/vulnerability/pdf/2023-020_en.pdfVendor advisory, Vendor advisory
    • jvn.jpvu/JVNVU95103362government-resource, Third-party advisory
    • cisa.govnews-events/ics-advisories/icsa-24-030-02government-resource, Third-party advisory, US government resource
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    <a href="https://intel.neosec.eu/en/cve/CVE-2023-6942"><img src="https://intel.neosec.eu/badge/cve/CVE-2023-6942.svg?lang=en" alt="CVE-2023-6942 – NEOSEC Intel" height="20"></a>