ICSA-26-062-01

Vulnerability from csaf_cisa - Published: 2026-03-03 00:00 - Updated: 2026-05-07 06:00
Summary
Mitsubishi Electric MELSEC iQ-F Series EtherNet/IP module and Ethernet Module (Update A)
Notes
Risk evaluation: Successful exploitation of these vulnerabilities could allow a remote attacker to cause a denial-of-service condition on the affected products by continuously sending UDP packets to the products.
Critical infrastructure sectors: Critical Manufacturing
Countries/areas deployed: Worldwide
Company headquarters location: Japan
Legal Notice and Terms of Use: This product is provided subject to this Notification (https://www.cisa.gov/notification) and this Privacy & Use policy (https://www.cisa.gov/privacy-policy).
Advisory Conversion Disclaimer: This ICSA is a republication of Mitsubishi Electric 2025-021 from a direct conversion of the vendor's Common Security Advisory Framework (CSAF) advisory. This is republished to CISA's website as a means of increasing visibility and is provided "as-is" for informational purposes only. CISA is not responsible for the editorial or technical accuracy of republished advisories and provides no warranties of any kind regarding any information contained within this advisory. Further, CISA does not endorse any commercial product or service. Please contact Mitsubishi Electric directly for any questions regarding this advisory.
Critical infrastructure sectors: Commercial Facilities
Recommended Practices: CISA recommends users take defensive measures to minimize the exploitation risk of this vulnerability. Minimize network exposure for all control system devices and/or systems, and ensure they are not accessible from the internet. Locate control system networks and remote devices behind firewalls and isolate them from business networks. When remote access is required, use more secure methods, such as virtual private networks (VPNs), recognizing VPNs may have vulnerabilities and should be updated to the most recent version available. Also recognize VPN is only as secure as its connected devices.
Recommended Practices: CISA reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures.
Recommended Practices: CISA also provides a section for control systems security recommended practices on the ICS webpage on cisa.gov. Several CISA products detailing cyber defense best practices are available for reading and download, including Improving Industrial Control Systems Cybersecurity with Defense-in-Depth Strategies.
Recommended Practices: CISA encourages organizations to implement recommended cybersecurity strategies for proactive defense of ICS assets. Additional mitigation guidance and recommended practices are publicly available on the ICS webpage at cisa.gov in the technical information paper, ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation Strategies.
Recommended Practices: Organizations observing suspected malicious activity should follow established internal procedures and report findings to CISA for tracking and correlation against other incidents.
CVE-2026-1874
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE-670 - Always-Incorrect Control Flow Implementation
Vendor Fix Mitsubishi Electric is releasing fixed version 1.107 or later for Mitsubishi Electric MELSEC iQ-F Series FX5-ENET/IP Ethernet Module FX5-ENET/IP. Download the fixed version from the link "https://www.mitsubishielectric.com/fa/download/index.html" and install it. For the update procedure, refer to "9.2 Update Using the Engineering Tool Updating the firmware for the intelligent function module" in the MELSEC iQ-F FX5 User's Manual (Application) which can be downloaded from the link "https://www.mitsubishielectric.com/fa/download/index.html." For more information on the fixed version, refer to the Mitsubishi Electric security advisory at "https://www.mitsubishielectric.com/psirt/vulnerability/pdf/2025-021_en.pdf." https://www.mitsubishielectric.com/psirt/vulnerab…
Vendor Fix Mitsubishi Electric is releasing fixed version 1.001 or later for Mitsubishi Electric MELSEC iQ-F Series FX5-EIP EtherNet/IP Module FX5-EIP. Download the fixed version from the link "https://www.mitsubishielectric.com/fa/download/index.html" and install it. For the update procedure, refer to "9.2 Update Using the Engineering Tool Updating the firmware for the intelligent function module" in the MELSEC iQ-F FX5 User's Manual (Application) which can be downloaded from the link "https://www.mitsubishielectric.com/fa/download/index.html." For more information on the fixed version, refer to the Mitsubishi Electric security advisory at "https://www.mitsubishielectric.com/psirt/vulnerability/pdf/2025-021_en.pdf". https://www.mitsubishielectric.com/psirt/vulnerab…
Mitigation For users who cannot immediately update the product, Mitsubishi Electric recommends using a firewall, virtual private network (VPN), etc. to prevent unauthorized access when internet access is required, to minimize the risk of exploiting this vulnerability.
Mitigation For users who cannot immediately update the product, Mitsubishi Electric recommends using the affected product within a LAN and blocking access from untrusted networks and hosts through firewalls, to minimize the risk of exploiting this vulnerability.
Mitigation For users who cannot immediately update the product, Mitsubishi Electric recommends using the IP filter function of the affected product to block access from untrusted hosts and minimize the risk of exploiting this vulnerability. For details on the IP filter function, refer to "13.1 IP Filter Function" in the MELSEC iQ-F FX5 User's Manual (Communication) which can be downloaded from the link "https://www.mitsubishielectric.com/fa/download/index.html."
Mitigation For users who cannot immediately update the product, Mitsubishi Electric recommends restricting physical access to the affected product, as well as to PCs and network devices to which it is connected, to minimize the risk of exploiting this vulnerability.
Mitigation For users who cannot immediately update the product, Mitsubishi Electric recommends installing anti-virus software on PCs that can access the affected product, to minimize the risk of exploiting this vulnerability.
CVE-2026-1875
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE-404 - Improper Resource Shutdown or Release
Vendor Fix Mitsubishi Electric is releasing fixed version 1.001 or later for Mitsubishi Electric MELSEC iQ-F Series FX5-EIP EtherNet/IP Module FX5-EIP. Download the fixed version from the link "https://www.mitsubishielectric.com/fa/download/index.html" and install it. For the update procedure, refer to "9.2 Update Using the Engineering Tool Updating the firmware for the intelligent function module" in the MELSEC iQ-F FX5 User's Manual (Application) which can be downloaded from the link "https://www.mitsubishielectric.com/fa/download/index.html." For more information on the fixed version, refer to the Mitsubishi Electric security advisory at "https://www.mitsubishielectric.com/psirt/vulnerability/pdf/2025-021_en.pdf". https://www.mitsubishielectric.com/psirt/vulnerab…
Mitigation For users who cannot immediately update the product, Mitsubishi Electric recommends using a firewall, virtual private network (VPN), etc. to prevent unauthorized access when internet access is required, to minimize the risk of exploiting this vulnerability.
Mitigation For users who cannot immediately update the product, Mitsubishi Electric recommends using the affected product within a LAN and blocking access from untrusted networks and hosts through firewalls, to minimize the risk of exploiting this vulnerability.
Mitigation For users who cannot immediately update the product, Mitsubishi Electric recommends using the IP filter function of the affected product to block access from untrusted hosts and minimize the risk of exploiting this vulnerability. For details on the IP filter function, refer to "13.1 IP Filter Function" in the MELSEC iQ-F FX5 User's Manual (Communication) which can be downloaded from the link "https://www.mitsubishielectric.com/fa/download/index.html."
Mitigation For users who cannot immediately update the product, Mitsubishi Electric recommends restricting physical access to the affected product, as well as to PCs and network devices to which it is connected, to minimize the risk of exploiting this vulnerability.
Mitigation For users who cannot immediately update the product, Mitsubishi Electric recommends installing anti-virus software on PCs that can access the affected product, to minimize the risk of exploiting this vulnerability.
CVE-2026-1876
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE-404 - Improper Resource Shutdown or Release
No Fix Planned There are no plans to release a fixed version. Please take the mitigations.
Mitigation Mitsubishi Electric recommends using a firewall, virtual private network (VPN), etc. to prevent unauthorized access when internet access is required, to minimize the risk of exploiting this vulnerability.
Mitigation Mitsubishi Electric recommends using the affected product within a LAN and blocking access from untrusted networks and hosts through firewalls, to minimize the risk of exploiting this vulnerability.
Mitigation Mitsubishi Electric recommends using the IP filter function of the affected product to block access from untrusted hosts and minimize the risk of exploiting this vulnerability. For details on the IP filter function, refer to "13.1 IP Filter Function" in the MELSEC iQ-F FX5 User's Manual (Communication) which can be downloaded from the link "https://www.mitsubishielectric.com/fa/download/index.html."
Mitigation Mitsubishi Electric recommends restricting physical access to the affected product, as well as to PCs and network devices to which it is connected, to minimize the risk of exploiting this vulnerability.
Mitigation Mitsubishi Electric recommends installing anti-virus software on PCs that can access the affected product, to minimize the risk of exploiting this vulnerability.
References
Acknowledgments
Mitsubishi Electric
To clipboard 

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    "title": "Mitsubishi Electric MELSEC iQ-F Series EtherNet/IP module and Ethernet Module (Update A)",
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      "cwe": {
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        "name": "Always-Incorrect Control Flow Implementation"
      },
      "notes": [
        {
          "category": "summary",
          "text": "An always-incorrect control flow implementation vulnerability exists in Ethernet function of MELSEC iQ-F Series FX5-EIP EtherNet/IP module and FX5-ENET/IP Ethernet module. This vulnerability could allow a remote attacker to cause uncontrolled receive buffer consumption in the affected product by continuously sending UDP packets, resulting in a denial-of-service condition. A system reset of the product is required for recovery.",
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        {
          "category": "vendor_fix",
          "details": "Mitsubishi Electric is releasing fixed version 1.107 or later for Mitsubishi Electric MELSEC iQ-F Series FX5-ENET/IP Ethernet Module FX5-ENET/IP. Download the fixed version from the link \"https://www.mitsubishielectric.com/fa/download/index.html\" and install it. For the update procedure, refer to \"9.2 Update Using the Engineering Tool Updating the firmware for the intelligent function module\" in the MELSEC iQ-F FX5 User\u0027s Manual (Application) which can be downloaded from the link \"https://www.mitsubishielectric.com/fa/download/index.html.\" For more information on the fixed version, refer to the Mitsubishi Electric security advisory at \"https://www.mitsubishielectric.com/psirt/vulnerability/pdf/2025-021_en.pdf.\"",
          "product_ids": [
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          "url": "https://www.mitsubishielectric.com/psirt/vulnerability/pdf/2025-021_en.pdf"
        },
        {
          "category": "vendor_fix",
          "details": "Mitsubishi Electric is releasing fixed version 1.001 or later for Mitsubishi Electric MELSEC iQ-F Series FX5-EIP EtherNet/IP Module FX5-EIP. Download the fixed version from the link \"https://www.mitsubishielectric.com/fa/download/index.html\" and install it. For the update procedure, refer to \"9.2 Update Using the Engineering Tool Updating the firmware for the intelligent function module\" in the MELSEC iQ-F FX5 User\u0027s Manual (Application) which can be downloaded from the link \"https://www.mitsubishielectric.com/fa/download/index.html.\" For more information on the fixed version, refer to the Mitsubishi Electric security advisory at \"https://www.mitsubishielectric.com/psirt/vulnerability/pdf/2025-021_en.pdf\".",
          "product_ids": [
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          "url": "https://www.mitsubishielectric.com/psirt/vulnerability/pdf/2025-021_en.pdf"
        },
        {
          "category": "mitigation",
          "details": "For users who cannot immediately update the product, Mitsubishi Electric recommends using a firewall, virtual private network (VPN), etc. to prevent unauthorized access when internet access is required, to minimize the risk of exploiting this vulnerability.",
          "product_ids": [
            "CSAFPID-0001",
            "CSAFPID-0003"
          ]
        },
        {
          "category": "mitigation",
          "details": "For users who cannot immediately update the product, Mitsubishi Electric recommends using the affected product within a LAN and blocking access from untrusted networks and hosts through firewalls, to minimize the risk of exploiting this vulnerability.",
          "product_ids": [
            "CSAFPID-0001",
            "CSAFPID-0003"
          ]
        },
        {
          "category": "mitigation",
          "details": "For users who cannot immediately update the product, Mitsubishi Electric recommends using the IP filter function of the affected product to block access from untrusted hosts and minimize the risk of exploiting this vulnerability. For details on the IP filter function, refer to \"13.1 IP Filter Function\" in the MELSEC iQ-F FX5 User\u0027s Manual (Communication) which can be downloaded from the link \"https://www.mitsubishielectric.com/fa/download/index.html.\"",
          "product_ids": [
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            "CSAFPID-0003"
          ]
        },
        {
          "category": "mitigation",
          "details": "For users who cannot immediately update the product, Mitsubishi Electric recommends restricting physical access to the affected product, as well as to PCs and network devices to which it is connected, to minimize the risk of exploiting this vulnerability.",
          "product_ids": [
            "CSAFPID-0001",
            "CSAFPID-0003"
          ]
        },
        {
          "category": "mitigation",
          "details": "For users who cannot immediately update the product, Mitsubishi Electric recommends installing anti-virus software on PCs that can access the affected product, to minimize the risk of exploiting this vulnerability.",
          "product_ids": [
            "CSAFPID-0001",
            "CSAFPID-0003"
          ]
        }
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      "scores": [
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "products": [
            "CSAFPID-0001",
            "CSAFPID-0003"
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      ]
    },
    {
      "cve": "CVE-2026-1875",
      "cwe": {
        "id": "CWE-404",
        "name": "Improper Resource Shutdown or Release"
      },
      "notes": [
        {
          "category": "summary",
          "text": "An improper resource shutdown or release vulnerability exists in Ethernet function of MELSEC iQ-F Series FX5-EIP EtherNet/IP module. This vulnerability could allow a remote attacker to cause uncontrolled receive buffer consumption in the affected product by continuously sending UDP packets, resulting in a denial-of-service condition. A system reset of the product is required for recovery.",
          "title": "Vulnerability Summary"
        },
        {
          "category": "details",
          "text": "SSVCv2/E:N/A:Y/T:P/2026-04-28T00:00:00Z/",
          "title": "SSVC"
        }
      ],
      "product_status": {
        "known_affected": [
          "CSAFPID-0003"
        ]
      },
      "references": [
        {
          "category": "external",
          "summary": "www.cve.org",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-1875"
        },
        {
          "category": "external",
          "summary": "www.first.org",
          "url": "https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
        },
        {
          "category": "external",
          "summary": "www.first.org",
          "url": "https://www.first.org/cvss/calculator/4.0#CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"
        },
        {
          "category": "external",
          "summary": "cwe.mitre.org",
          "url": "https://cwe.mitre.org/data/definitions/404.html"
        }
      ],
      "remediations": [
        {
          "category": "vendor_fix",
          "details": "Mitsubishi Electric is releasing fixed version 1.001 or later for Mitsubishi Electric MELSEC iQ-F Series FX5-EIP EtherNet/IP Module FX5-EIP. Download the fixed version from the link \"https://www.mitsubishielectric.com/fa/download/index.html\" and install it. For the update procedure, refer to \"9.2 Update Using the Engineering Tool Updating the firmware for the intelligent function module\" in the MELSEC iQ-F FX5 User\u0027s Manual (Application) which can be downloaded from the link \"https://www.mitsubishielectric.com/fa/download/index.html.\" For more information on the fixed version, refer to the Mitsubishi Electric security advisory at \"https://www.mitsubishielectric.com/psirt/vulnerability/pdf/2025-021_en.pdf\".",
          "product_ids": [
            "CSAFPID-0003"
          ],
          "url": "https://www.mitsubishielectric.com/psirt/vulnerability/pdf/2025-021_en.pdf"
        },
        {
          "category": "mitigation",
          "details": "For users who cannot immediately update the product, Mitsubishi Electric recommends using a firewall, virtual private network (VPN), etc. to prevent unauthorized access when internet access is required, to minimize the risk of exploiting this vulnerability.",
          "product_ids": [
            "CSAFPID-0003"
          ]
        },
        {
          "category": "mitigation",
          "details": "For users who cannot immediately update the product, Mitsubishi Electric recommends using the affected product within a LAN and blocking access from untrusted networks and hosts through firewalls, to minimize the risk of exploiting this vulnerability.",
          "product_ids": [
            "CSAFPID-0003"
          ]
        },
        {
          "category": "mitigation",
          "details": "For users who cannot immediately update the product, Mitsubishi Electric recommends using the IP filter function of the affected product to block access from untrusted hosts and minimize the risk of exploiting this vulnerability. For details on the IP filter function, refer to \"13.1 IP Filter Function\" in the MELSEC iQ-F FX5 User\u0027s Manual (Communication) which can be downloaded from the link \"https://www.mitsubishielectric.com/fa/download/index.html.\"",
          "product_ids": [
            "CSAFPID-0003"
          ]
        },
        {
          "category": "mitigation",
          "details": "For users who cannot immediately update the product, Mitsubishi Electric recommends restricting physical access to the affected product, as well as to PCs and network devices to which it is connected, to minimize the risk of exploiting this vulnerability.",
          "product_ids": [
            "CSAFPID-0003"
          ]
        },
        {
          "category": "mitigation",
          "details": "For users who cannot immediately update the product, Mitsubishi Electric recommends installing anti-virus software on PCs that can access the affected product, to minimize the risk of exploiting this vulnerability.",
          "product_ids": [
            "CSAFPID-0003"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "products": [
            "CSAFPID-0003"
          ]
        }
      ]
    },
    {
      "cve": "CVE-2026-1876",
      "cwe": {
        "id": "CWE-404",
        "name": "Improper Resource Shutdown or Release"
      },
      "notes": [
        {
          "category": "summary",
          "text": "An improper resource shutdown or release vulnerability exists in Ethernet function of MELSEC iQ-F Series FX5-ENET/IP Ethernet module. This vulnerability could allow a remote attacker to cause uncontrolled receive buffer consumption in the affected product by continuously sending UDP packets, resulting in a denial-of-service condition. A system reset of the product is required for recovery.",
          "title": "Vulnerability Summary"
        },
        {
          "category": "details",
          "text": "SSVCv2/E:N/A:Y/T:P/2026-04-28T00:00:00Z/",
          "title": "SSVC"
        }
      ],
      "product_status": {
        "known_affected": [
          "CSAFPID-0002"
        ]
      },
      "references": [
        {
          "category": "external",
          "summary": "www.cve.org",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-1876"
        },
        {
          "category": "external",
          "summary": "www.first.org",
          "url": "https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
        },
        {
          "category": "external",
          "summary": "www.first.org",
          "url": "https://www.first.org/cvss/calculator/4.0#CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"
        },
        {
          "category": "external",
          "summary": "cwe.mitre.org",
          "url": "https://cwe.mitre.org/data/definitions/404.html"
        }
      ],
      "remediations": [
        {
          "category": "no_fix_planned",
          "details": "There are no plans to release a fixed version. Please take the mitigations.",
          "product_ids": [
            "CSAFPID-0002"
          ]
        },
        {
          "category": "mitigation",
          "details": "Mitsubishi Electric recommends using a firewall, virtual private network (VPN), etc. to prevent unauthorized access when internet access is required, to minimize the risk of exploiting this vulnerability.",
          "product_ids": [
            "CSAFPID-0002"
          ]
        },
        {
          "category": "mitigation",
          "details": "Mitsubishi Electric recommends using the affected product within a LAN and blocking access from untrusted networks and hosts through firewalls, to minimize the risk of exploiting this vulnerability.",
          "product_ids": [
            "CSAFPID-0002"
          ]
        },
        {
          "category": "mitigation",
          "details": "Mitsubishi Electric recommends using the IP filter function of the affected product to block access from untrusted hosts and minimize the risk of exploiting this vulnerability. For details on the IP filter function, refer to \"13.1 IP Filter Function\" in the MELSEC iQ-F FX5 User\u0027s Manual (Communication) which can be downloaded from the link \"https://www.mitsubishielectric.com/fa/download/index.html.\"",
          "product_ids": [
            "CSAFPID-0002"
          ]
        },
        {
          "category": "mitigation",
          "details": "Mitsubishi Electric recommends restricting physical access to the affected product, as well as to PCs and network devices to which it is connected, to minimize the risk of exploiting this vulnerability.",
          "product_ids": [
            "CSAFPID-0002"
          ]
        },
        {
          "category": "mitigation",
          "details": "Mitsubishi Electric recommends installing anti-virus software on PCs that can access the affected product, to minimize the risk of exploiting this vulnerability.",
          "product_ids": [
            "CSAFPID-0002"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "products": [
            "CSAFPID-0002"
          ]
        }
      ]
    }
  ]
}


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Tags
Taxonomy of the tags.




Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.