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Unrated severityNVD Advisory· Published Nov 6, 2023· Updated Dec 16, 2025

Arbitrary Command Execution Vulnerability in Mitsubishi Electric proprietary protocol communication of multiple FA products

CVE-2023-4699

Description

A critical missing-authentication flaw (CVSS 10.0) in multiple Mitsubishi Electric FA product series allows remote unauthenticated command execution, leading to data disclosure, tampering, or denial-of-service.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

A critical missing-authentication flaw (CVSS 10.0) in multiple Mitsubishi Electric FA product series allows remote unauthenticated command execution, leading to data disclosure, tampering, or denial-of-service.

Vulnerability

CVE-2023-4699 is a Missing Authentication for Critical Function vulnerability (CWE-306) affecting multiple Mitsubishi Electric FA product lines including MELSEC-F series CPU modules (when used with an Ethernet adapter), MELSEC iQ-F series, MELSEC iQ-R series CPU modules, MELSEC iQ-L series, MELSEC Q series, MELSEC-L series, and several CNC series (M800V/M80V, M800/M80/E80, M700V/M70V/E70). The vulnerability exists in the vendor-specific protocol communication and allows a remote unauthenticated attacker to execute arbitrary commands by sending specially crafted packets to the affected products [1][2]. The official advisory notes that MELSEC-F series units are only vulnerable when paired with FX3U-ENET-ADP or FX3U-ENET(-L) adapters (excluding model FX3GE-xMy/z) [1]. All versions of the listed models are affected [1].

Exploitation

An attacker needs network connectivity to the target device; no authentication, user interaction, or special access is required. The attack complexity is low, and exploitation does not require any privileges [1]. By sending a crafted series of packets over the network to the affected CPU module, the attacker can trigger arbitrary command execution on the device [2]. The vulnerability is remotely exploitable without any preconditions [1].

Impact

Successful exploitation allows a remote unauthenticated attacker to execute arbitrary commands on the affected product. This can lead to full compromise of the confidentiality, integrity, and availability of the device: an attacker can read or write control programs to disclose or tamper with information, reset memory contents to factory settings, or remotely reset the device, causing a denial-of-service (DoS) condition [1][2]. The CVSS v3.1 base score is 10.0 (Critical) with a scope change, indicating potential impact beyond the vulnerable component [1].

Mitigation

Mitsubishi Electric has released firmware updates for the affected product series; users should apply the latest firmware version available from the vendor’s download site as specified in the advisory [1]. For MELSEC-F series modules, users must ensure the Ethernet adapter firmware is also updated. No workaround is provided for unpatched systems. Users unable to update immediately should restrict network access to the affected devices, use firewalls or VPNs, and monitor network traffic for anomalous packets [1]. The vulnerability is not listed on the CISA Known Exploited Vulnerabilities (KEV) catalog as of the publication date.

References
  1. Mitsubishi Electric MELSEC Series (Update A) | CISA
  2. JVNVU#94620134: 三菱電機製複数のFA製品における複数の脆弱性

AI Insight generated on May 25, 2026. Synthesized from this CVE's description and the cited reference URLs; citations are validated against the source bundle.

Affected products

286
  • Mitsubishielectric/Mitsubishi Electric CNC M800V/M80V seriesllm-create18 versions
    (expand)+ 17 more
    • (no CPE)
    • (no CPE)range: System Number BND-1022W000 all versions
    • (no CPE)range: System Number BND-2009W000 all versions
    • (no CPE)range: System Number BND-1012W000 all versions
    • (no CPE)range: System Number BND-1015W000 all versions
    • (no CPE)range: System Number BND-1012W000 all versions
    • (no CPE)range: System Number BND-1015W000 all versions
    • (no CPE)range: System Number BND-1012W002 all versions
    • (no CPE)range: System Number BND-1015W002 all versions
    • (no CPE)range: System Number BND-1018W000 all versions
    • (no CPE)range: System Number BND-2006W000 all versions
    • (no CPE)range: System Number BND-2005W000 all versions
    • (no CPE)range: System Number BND-2052W000 all versions
    • (no CPE)range: System Number BND-2051W000 all versions
    • (no CPE)range: System Number BND-2007W000 all versions
    • (no CPE)range: System Number BND-2008W000all versions
    • (no CPE)range: System Number BND-2053W000 all versions
    • (no CPE)range: System Number BND-2054W000 all versions
  • Mitsubishielectric/MELSEC iQ-R Seriesllm-fuzzy35 versions
    (expand)+ 34 more
    • (no CPE)
    • (no CPE)range: all versions
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  • Mitsubishielectric/MELSEC iQ-F Series CPU modulellm-fuzzy
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3G-14MR/DSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3G-14MR/ESv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3G-14MR/ES-Av5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3G-14MT/DSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3G-14MT/DSSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3G-14MT/ESv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3G-14MT/ES-Av5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3G-14MT/ESSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3G-24MR/DSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3G-24MR/ESv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3G-24MR/ES-Av5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3G-24MT/DSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3G-24MT/DSSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3G-24MT/ESv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3G-24MT/ES-Av5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3G-24MT/ESSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3G-40MR/DSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3G-40MR/ESv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3G-40MR/ES-Av5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3G-40MT/DSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3G-40MT/DSSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3G-40MT/ESv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3G-40MT/ES-Av5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3G-40MT/ESSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3G-60MR/DSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3G-60MR/ESv5
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  • Mitsubishi Electric Corporation/MELSEC-F Series FX3G-60MR/ES-Av5
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  • Mitsubishi Electric Corporation/MELSEC-F Series FX3G-60MT/DSv5
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  • Mitsubishi Electric Corporation/MELSEC-F Series FX3G-60MT/DSSv5
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  • Mitsubishi Electric Corporation/MELSEC-F Series FX3G-60MT/ESv5
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  • Mitsubishi Electric Corporation/MELSEC-F Series FX3G-60MT/ESSv5
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  • Mitsubishi Electric Corporation/MELSEC-F Series FX3GA-24MR-CMv5
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  • Mitsubishi Electric Corporation/MELSEC-F Series FX3GA-24MT-CMv5
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  • Mitsubishi Electric Corporation/MELSEC-F Series FX3GA-40MR-CMv5
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  • Mitsubishi Electric Corporation/MELSEC-F Series FX3GA-40MT-CMv5
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  • Mitsubishi Electric Corporation/MELSEC-F Series FX3GA-60MR-CMv5
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  • Mitsubishi Electric Corporation/MELSEC-F Series FX3GA-60MT-CMv5
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  • Mitsubishi Electric Corporation/MELSEC-F Series FX3GC-32MT/Dv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3GC-32MT/DSSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3GE-24MR/DSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3GE-24MR/ESv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3GE-24MT/DSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3GE-24MT/DSSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3GE-24MT/ESv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3GE-24MT/ESSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3GE-40MR/DSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3GE-40MR/ESv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3GE-40MT/DSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3GE-40MT/DSSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3GE-40MT/ESv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3GE-40MT/ESSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3S-10MR/DSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3S-10MR/ESv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3S-10MT/DSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3S-10MT/DSSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3S-10MT/ESv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3S-10MT/ESSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3S-14MR/DSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3S-14MR/ESv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3S-14MT/DSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3S-14MT/DSSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3S-14MT/ESv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3S-14MT/ESSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3S-20MR/DSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3S-20MR/ESv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3S-20MT/DSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3S-20MT/DSSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3S-20MT/ESv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3S-20MT/ESSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3S-30MR/DSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3S-30MR/ESv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3S-30MR/ES-2ADv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3S-30MT/DSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3S-30MT/DSSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3S-30MT/ESv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3S-30MT/ES-2ADv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3S-30MT/ESSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3S-30MT/ESS-2ADv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3SA-10MR-CMv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3SA-10MT-CMv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3SA-14MR-CMv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3SA-14MT-CMv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3SA-20MR-CMv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3SA-20MT-CMv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3SA-30MR-CMv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3SA-30MT-CMv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3U-128MR/DSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3U-128MR/ESv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3U-128MR/ES-Av5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3U-128MT/DSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3U-128MT/DSSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3U-128MT/ESv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3U-128MT/ES-Av5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3U-128MT/ESSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3U-16MR/DSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3U-16MR/ESv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3U-16MR/ES-Av5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3U-16MT/DSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3U-16MT/DSSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3U-16MT/ESv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3U-16MT/ES-Av5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3U-16MT/ESSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3U-32MR/DSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3U-32MR/ESv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3U-32MR/ES-Av5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3U-32MR/UA1v5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3U-32MS/ESv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3U-32MT/DSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3U-32MT/DSSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3U-32MT/ESv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3U-32MT/ES-Av5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3U-32MT/ESSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3U-48MR/DSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3U-48MR/ESv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3U-48MR/ES-Av5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3U-48MT/DSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3U-48MT/DSSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3U-48MT/ESv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3U-48MT/ES-Av5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3U-48MT/ESSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3U-64MR/DSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3U-64MR/ESv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3U-64MR/ES-Av5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3U-64MR/UA1v5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3U-64MS/ESv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3U-64MT/DSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3U-64MT/DSSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3U-64MT/ESv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3U-64MT/ES-Av5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3U-64MT/ESSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3U-80MR/DSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3U-80MR/ESv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3U-80MR/ES-Av5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3U-80MT/DSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3U-80MT/DSSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3U-80MT/ESv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3U-80MT/ES-Av5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3U-80MT/ESSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3UC-16MR/DS-Tv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3UC-16MR/D-Tv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3UC-16MT/Dv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3UC-16MT/D-P4v5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3UC-16MT/DSSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3UC-16MT/DSS-P4v5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3UC-32MT/Dv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3UC-32MT/DSSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3UC-32MT-LTv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3UC-32MT-LT-2v5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3UC-64MT/Dv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3UC-64MT/DSSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3UC-96MT/Dv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC-F Series FX3UC-96MT/DSSv5
    Range: all versions
  • Mitsubishielectric/MELSEC iQ-F Series FX5-ENETcpe-rescue58 versions
    all versions+ 57 more
    • (no CPE)range: all versions
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  • Mitsubishi Electric Corporation/MELSEC iQ-F Series FX5UC-32MR/DS-TSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC iQ-F Series FX5UC-32MT/DSSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC iQ-F Series FX5UC-32MT/DSS-TSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC iQ-F Series FX5UC-32MT/DS-TSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC iQ-F Series FX5UC-64MT/DSSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC iQ-F Series FX5UC-96MT/DSSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC iQ-F Series FX5UJ-24MT/DSSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC iQ-F Series FX5UJ-40MT/DSSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC iQ-F Series FX5UJ-60MT/DSSv5
    Range: all versions
  • Mitsubishi Electric Corporation/MELSEC L Series LD77MS16v5
    Range: all versions
  • Mitsubishielectric/MELSEC-Q Seriescpe-rescue8 versions
    all versions+ 7 more
    • (no CPE)range: all versions
    • (no CPE)range: all versions
    • (no CPE)range: all versions
    • (no CPE)range: all versions
    • (no CPE)range: all versions
    • (no CPE)range: all versions
    • (no CPE)range: all versions
    • (no CPE)range: all versions
  • Mitsubishielectric/MELSEC-Q Series Q03UDVCPUcpe-rescue3 versions
    all versions+ 2 more
    • (no CPE)range: all versions
    • (no CPE)range: all versions
    • (no CPE)range: all versions

Patches

0

No patches discovered yet.

Vulnerability mechanics

No source-code context for this CVE — mechanics is only generated when we can read the actual fix diff. Without that, the four sections (root cause, attack vector, affected code, fix) would be speculation rather than analysis.

References

3

News mentions

0

No linked articles in our index yet.