CriticalCVE-2021-20587

    Mitsubishi Electric CPU Module Logging Configuration Tool: Heap-based Buffer Overflow (CVE-2021-20587)

    Published Sources: CVE.org

    What is affected, what to do

    Heap-based buffer overflow vulnerability in Mitsubishi Electric FA Engineering Software (CPU Module Logging Configuration Tool versions 1.112R and prior, CW Configurator versions 1.011M and prior, Data Transfer versions 3.44W and prior, EZSocket versions 5.4 and prior, FR Configurator all versions, FR Configurator SW3 all versions, FR Configurator2 versions 1.24A and prior, GT Designer3 Version1(GOT1000) versions 1.250L and prior, GT Designer3 Version1(GOT2000) versions 1.250L and prior, GT SoftGOT1000 Version3 versions 3.245F and prior, GT SoftGOT2000 Version1 versions 1.250L and prior, GX Configurator-DP versions 7.14Q and prior, GX Configurator-QP all versions, GX Developer versions 8.506C and prior, GX Explorer all versions, GX IEC Developer all versions, GX LogViewer versions 1.115U and prior, GX RemoteService-I all versions, GX Works2 versions 1.597X and prior, GX Works3 versions 1.070Y and prior, iQ Monozukuri ANDON (Data Transfer) versions 1.003D and prior, iQ Monozukuri Process Remote Monitoring (Data Transfer) versions 1.002C and prior, M_CommDTM-HART all versions, M_CommDTM-IO-Link versions 1.03D and prior, MELFA-Works versions 4.4 and prior, MELSEC WinCPU Setting Utility all versions, MELSOFT EM Software Development Kit (EM Configurator) versions 1.015R and prior, MELSOFT Navigator versions 2.74C and prior, MH11 SettingTool Version2 versions 2.004E and prior, MI Configurator versions 1.004E and prior, MT Works2 versions 1.167Z and prior, MX Component versions 5.001B and prior, Network Interface Board CC IE Control utility versions 1.29F and prior, Network Interface Board CC IE Field Utility versions 1.16S and prior, Network Interface Board CC-Link Ver.2 Utility versions 1.23Z and prior, Network Interface Board MNETH utility versions 34L and prior, PX Developer versions 1.53F and prior, RT ToolBox2 versions 3.73B and prior, RT ToolBox3 versions 1.82L and prior, Setting/monitoring tools for the C Controller module (SW4PVC-CCPU) versions 4.12N and prior, and SLMP Data Collector versions 1.04E and prior) allows a remote unauthenticated attacker to cause a DoS condition on the software products, and possibly to execute a malicious code on the personal computer running the software products although it has not been reproduced, by spoofing MELSEC, GOT or FREQROL and returning crafted reply packets.

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

    Affected
    • Mitsubishi Electric CPU Module Logging Configuration Tool eq 1.112R and prior..1.112R and prior
    • Mitsubishi Electric CW Configurator eq 1.011M and prior..1.011M and prior
    • Mitsubishi Electric Data Transfer eq 3.44W and prior..3.44W and prior
    • Mitsubishi Electric EZSocket eq 5.4 and prior..5.4 and prior
    • Mitsubishi Electric FR Configurator eq all versions..all versions
    • Mitsubishi Electric FR Configurator SW3 eq all versions..all versions
    • Mitsubishi Electric FR Configurator2 eq 1.24A and prior..1.24A and prior
    • Mitsubishi Electric GT Designer3 Version1 (GOT1000) eq 1.250L and prior..1.250L and prior
    • Mitsubishi Electric GT Designer3 Version1 (GOT2000) eq 1.250L and prior..1.250L and prior
    • Mitsubishi Electric GT SoftGOT1000 Version3 eq 3.245F and prior..3.245F and prior
    • Mitsubishi Electric GT SoftGOT2000 Version1 eq 1.250L and prior..1.250L and prior
    • Mitsubishi Electric GX Configurator-DP eq 7.14Q and prior..7.14Q and prior
    • Mitsubishi Electric GX Configurator-QP eq all versions..all versions
    • Mitsubishi Electric GX Developer eq 8.506C and prior..8.506C and prior
    • Mitsubishi Electric GX Explorer eq all versions..all versions
    • Mitsubishi Electric GX IEC Developer eq all versions..all versions
    • Mitsubishi Electric GX LogViewer eq 1.115U and prior..1.115U and prior
    • Mitsubishi Electric GX RemoteService-I eq all versions..all versions
    • Mitsubishi Electric GX Works2 eq 1.597X and prior..1.597X and prior
    • Mitsubishi Electric GX Works3 eq 1.070Y and prior..1.070Y and prior
    • Mitsubishi Electric iQ Monozukuri ANDON (Data Transfer) eq 1.003D and prior..1.003D and prior
    • Mitsubishi Electric iQ Monozukuri Process Remote Monitoring (Data Transfer) eq 1.002C and prior..1.002C and prior
    • Mitsubishi Electric M_CommDTM-HART eq all versions..all versions
    • Mitsubishi Electric M_CommDTM-IO-Link eq 1.03D and prior..1.03D and prior
    • Mitsubishi Electric MELFA-Works eq 4.4 and prior..4.4 and prior
    • Mitsubishi Electric MELSEC WinCPU Setting Utility eq all versions..all versions
    • Mitsubishi Electric MELSOFT EM Software Development Kit (EM Configurator) eq 1.015R and prior..1.015R and prior
    • Mitsubishi Electric MELSOFT Navigator eq 2.74C and prior..2.74C and prior
    • Mitsubishi Electric MH11 SettingTool Version2 eq 2.004E and prior..2.004E and prior
    • Mitsubishi Electric MI Configurator eq 1.004E and prior..1.004E and prior
    • Mitsubishi Electric MT Works2 eq 1.167Z and prior..1.167Z and prior
    • Mitsubishi Electric MX Component eq 5.001B and prior..5.001B and prior
    • Mitsubishi Electric Network Interface Board CC IE Control utility eq 1.29F and prior..1.29F and prior
    • Mitsubishi Electric Network Interface Board CC IE Field Utility eq 1.16S and prior..1.16S and prior
    • Mitsubishi Electric Network Interface Board CC-Link Ver.2 Utility eq 1.23Z and prior..1.23Z and prior
    • Mitsubishi Electric Network Interface Board MNETH utility eq 34L and prior..34L and prior
    • Mitsubishi Electric PX Developer eq 1.53F and prior..1.53F and prior
    • Mitsubishi Electric RT ToolBox2 eq 3.73B and prior..3.73B and prior
    • Mitsubishi Electric RT ToolBox3 eq 1.82L and prior..1.82L and prior
    • Mitsubishi Electric Setting/monitoring tools for the C Controller module (SW4PVC-CCPU) eq 4.12N and prior..4.12N and prior
    • Mitsubishi Electric SLMP Data Collector eq 1.04E and prior..1.04E and prior

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    Metrics

    9.8

    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: CVE.org

    3.9 %

    EPSS score

    Moderate — model estimates 1-10% exploitation likelihood.

    Source: FIRST EPSS, percentile 90.2

    Show all metrics
    Severity
    Critical
    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
    102.65 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
    9.8 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
    3.9 %
    Moderate — model estimates 1-10% 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
    90.2
    Critical — this CVE ranks in the top fifth of all CVEs scored today (rank ≥ 80%).
    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
    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-122

    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

    Heap-based buffer overflow vulnerability in Mitsubishi Electric FA Engineering Software (CPU Module Logging Configuration Tool versions 1.112R and prior, CW Configurator versions 1.011M and prior, Data Transfer versions 3.44W and prior, EZSocket versions 5.4 and prior, FR Configurator all versions, FR Configurator SW3 all versions, FR Configurator2 versions 1.24A and prior, GT Designer3 Version1(GOT1000) versions 1.250L and prior, GT Designer3 Version1(GOT2000) versions 1.250L and prior, GT SoftGOT1000 Version3 versions 3.245F and prior, GT SoftGOT2000 Version1 versions 1.250L and prior, GX Configurator-DP versions 7.14Q and prior, GX Configurator-QP all versions, GX Developer versions 8.506C and prior, GX Explorer all versions, GX IEC Developer all versions, GX LogViewer versions 1.115U and prior, GX RemoteService-I all versions, GX Works2 versions 1.597X and prior, GX Works3 versions 1.070Y and prior, iQ Monozukuri ANDON (Data Transfer) versions 1.003D and prior, iQ Monozukuri Process Remote Monitoring (Data Transfer) versions 1.002C and prior, M_CommDTM-HART all versions, M_CommDTM-IO-Link versions 1.03D and prior, MELFA-Works versions 4.4 and prior, MELSEC WinCPU Setting Utility all versions, MELSOFT EM Software Development Kit (EM Configurator) versions 1.015R and prior, MELSOFT Navigator versions 2.74C and prior, MH11 SettingTool Version2 versions 2.004E and prior, MI Configurator versions 1.004E and prior, MT Works2 versions 1.167Z and prior, MX Component versions 5.001B and prior, Network Interface Board CC IE Control utility versions 1.29F and prior, Network Interface Board CC IE Field Utility versions 1.16S and prior, Network Interface Board CC-Link Ver.2 Utility versions 1.23Z and prior, Network Interface Board MNETH utility versions 34L and prior, PX Developer versions 1.53F and prior, RT ToolBox2 versions 3.73B and prior, RT ToolBox3 versions 1.82L and prior, Setting/monitoring tools for the C Controller module (SW4PVC-CCPU) versions 4.12N and prior, and SLMP Data Collector versions 1.04E and prior) allows a remote unauthenticated attacker to cause a DoS condition on the software products, and possibly to execute a malicious code on the personal computer running the software products although it has not been reproduced, by spoofing MELSEC, GOT or FREQROL and returning crafted reply packets.

    Source: cvelistv5, NVD (NIST)

    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 CorporationCPU Module Logging Configuration Tool
    • 1.112R and prior
    • —
    Mitsubishi Electric CorporationCW Configurator
    • 1.011M and prior
    • —
    Mitsubishi Electric CorporationData Transfer
    • 3.44W and prior
    • —
    Mitsubishi Electric CorporationEZSocket
    • 5.4 and prior
    • —
    Mitsubishi Electric CorporationFR Configurator
    • all versions
    • —
    Mitsubishi Electric CorporationFR Configurator SW3
    • all versions
    • —
    Mitsubishi Electric CorporationFR Configurator2
    • 1.24A and prior
    • —
    Mitsubishi Electric CorporationGT Designer3 Version1(GOT1000)
    • 1.250L and prior
    • —
    Mitsubishi Electric CorporationGT Designer3 Version1(GOT2000)
    • 1.250L and prior
    • —
    Mitsubishi Electric CorporationGT SoftGOT1000 Version3
    • 3.245F and prior
    • —
    Mitsubishi Electric CorporationGT SoftGOT2000 Version1
    • 1.250L and prior
    • —
    Mitsubishi Electric CorporationGX Configurator-DP
    • 7.14Q and prior
    • —
    Mitsubishi Electric CorporationGX Configurator-QP
    • all versions
    • —
    Mitsubishi Electric CorporationGX Developer
    • 8.506C and prior
    • —
    Mitsubishi Electric CorporationGX Explorer
    • all versions
    • —
    Mitsubishi Electric CorporationGX IEC Developer
    • all versions
    • —
    Mitsubishi Electric CorporationGX LogViewer
    • 1.115U and prior
    • —
    Mitsubishi Electric CorporationGX RemoteService-I
    • all versions
    • —
    Mitsubishi Electric CorporationGX Works2
    • 1.597X and prior
    • —
    Mitsubishi Electric CorporationGX Works3
    • 1.070Y and prior
    • —
    Mitsubishi Electric CorporationiQ Monozukuri ANDON (Data Transfer)
    • 1.003D and prior
    • —
    Mitsubishi Electric CorporationiQ Monozukuri Process Remote Monitoring (Data Transfer)
    • 1.002C and prior
    • —
    Mitsubishi Electric CorporationM_CommDTM-HART
    • all versions
    • —
    Mitsubishi Electric CorporationM_CommDTM-IO-Link
    • 1.03D and prior
    • —
    Mitsubishi Electric CorporationMELFA-Works
    • 4.4 and prior
    • —
    Mitsubishi Electric CorporationMELSEC WinCPU Setting Utility
    • all versions
    • —
    Mitsubishi Electric CorporationMELSOFT EM Software Development Kit (EM Configurator)
    • 1.015R and prior
    • —
    Mitsubishi Electric CorporationMELSOFT Navigator
    • 2.74C and prior
    • —
    Mitsubishi Electric CorporationMH11 SettingTool Version2
    • 2.004E and prior
    • —
    Mitsubishi Electric CorporationMI Configurator
    • 1.004E and prior
    • —
    Mitsubishi Electric CorporationMT Works2
    • 1.167Z and prior
    • —
    Mitsubishi Electric CorporationMX Component
    • 5.001B and prior
    • —
    Mitsubishi Electric CorporationNetwork Interface Board CC IE Control utility
    • 1.29F and prior
    • —
    Mitsubishi Electric CorporationNetwork Interface Board CC IE Field Utility
    • 1.16S and prior
    • —
    Mitsubishi Electric CorporationNetwork Interface Board CC-Link Ver.2 Utility
    • 1.23Z and prior
    • —
    Mitsubishi Electric CorporationNetwork Interface Board MNETH utility
    • 34L and prior
    • —
    Mitsubishi Electric CorporationPX Developer
    • 1.53F and prior
    • —
    Mitsubishi Electric CorporationRT ToolBox2
    • 3.73B and prior
    • —
    Mitsubishi Electric CorporationRT ToolBox3
    • 1.82L and prior
    • —
    Mitsubishi Electric CorporationSetting/monitoring tools for the C Controller module (SW4PVC-CCPU)
    • 4.12N and prior
    • —
    Mitsubishi Electric CorporationSLMP Data Collector
    • 1.04E and prior
    • —
    mitsubishielectricc_controller_module_setting_and_monitoring_tool
    • —
    • —
    mitsubishielectriccpu_module_logging_configuration_tool
    • ≤ 1.112r
    • —
    mitsubishielectriccw_configurator
    • ≤ 1.011m
    • —
    mitsubishielectricdata_transfer
    • ≤ 3.44w
    • —
    mitsubishielectricezsocket
    • —
    • —
    mitsubishielectricfr_configurator
    • —
    • —
    mitsubishielectricfr_configurator2
    • ≤ 1.24a
    • —

    Vendors and products

    Weakness classes (CWE)

    • CWE-122Heap-based Buffer Overflow

      Variant

      A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().

      Entry at MITRE CWE-122

    References & sources

    • mitsubishielectric.compsirt/vulnerability/pdf/2020-021_en.pdfVendor advisory
    • jvn.jpvu/JVNVU92330101government-resource
    • cisa.govnews-events/ics-advisories/icsa-21-049-02government-resource
    • mitsubishielectric.comen/psirt/vulnerability/pdf/2020-021_en.pdfVendor advisory, x_transferred, Vendor advisory
    • jvn.jpvu/JVNVU92330101/index.htmlgovernment-resource, x_transferred, Third-party advisory
    • us-cert.cisa.govics/advisories/icsa-21-049-02government-resource, x_transferred, Third-party advisory, US government resource
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    Badge preview for CVE-2021-20587
    <a href="https://intel.neosec.eu/en/cve/CVE-2021-20587"><img src="https://intel.neosec.eu/badge/cve/CVE-2021-20587.svg?lang=en" alt="CVE-2021-20587 – NEOSEC Intel" height="20"></a>