icsa-25-266-02
Vulnerability from csaf_cisa
Published
2025-09-23 06:00
Modified
2025-09-23 06:00
Summary
Mitsubishi Electric MELSEC-Q Series CPU Module

Notes

Legal Notice
All information products included in https://us-cert.cisa.gov/ics are provided "as is" for informational purposes only. The Department of Homeland Security (DHS) does not provide any warranties of any kind regarding any information contained within. DHS does not endorse any commercial product or service, referenced in this product or otherwise. Further dissemination of this product is governed by the Traffic Light Protocol (TLP) marking in the header. For more information about TLP, see https://us-cert.cisa.gov/tlp/.
Risk evaluation
Successful exploitation of this vulnerability could allow an attacker to cause a denial of service (DoS).
Critical infrastructure sectors
Critical Manufacturing
Countries/areas deployed
Worldwide
Company headquarters location
Japan
Recommended Practices
CISA recommends users take defensive measures to minimize the risk of exploitation of this vulnerability, such as:
Recommended Practices
Minimize network exposure for all control system devices and/or systems, ensuring they are not accessible from the internet.
Recommended Practices
Locate control system networks and remote devices behind firewalls and isolating them from business networks.
Recommended Practices
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 current version available. Also recognize VPN is only as secure as the 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/ics. 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.
Recommended Practices
Additional mitigation guidance and recommended practices are publicly available on the ICS webpage at cisa.gov/ics 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.
Recommended Practices
No known public exploitation specifically targeting this vulnerability has been reported to CISA at this time. This vulnerability has a high attack complexity.


To clipboard 

{
  "document": {
    "acknowledgments": [
      {
        "organization": "Mitsubishi Electric",
        "summary": "reporting this vulnerability to CISA"
      }
    ],
    "category": "csaf_security_advisory",
    "csaf_version": "2.0",
    "distribution": {
      "text": "Disclosure is not limited",
      "tlp": {
        "label": "WHITE",
        "url": "https://us-cert.cisa.gov/tlp/"
      }
    },
    "lang": "en-US",
    "notes": [
      {
        "category": "legal_disclaimer",
        "text": "All information products included in https://us-cert.cisa.gov/ics are provided \"as is\" for informational purposes only. The Department of Homeland Security (DHS) does not provide any warranties of any kind regarding any information contained within. DHS does not endorse any commercial product or service, referenced in this product or otherwise. Further dissemination of this product is governed by the Traffic Light Protocol (TLP) marking in the header. For more information about TLP, see https://us-cert.cisa.gov/tlp/.",
        "title": "Legal Notice"
      },
      {
        "category": "summary",
        "text": "Successful exploitation of this vulnerability could allow an attacker to cause a denial of service (DoS).",
        "title": "Risk evaluation"
      },
      {
        "category": "other",
        "text": "Critical Manufacturing",
        "title": "Critical infrastructure sectors"
      },
      {
        "category": "other",
        "text": "Worldwide",
        "title": "Countries/areas deployed"
      },
      {
        "category": "other",
        "text": "Japan",
        "title": "Company headquarters location"
      },
      {
        "category": "general",
        "text": "CISA recommends users take defensive measures to minimize the risk of exploitation of this vulnerability, such as:",
        "title": "Recommended Practices"
      },
      {
        "category": "general",
        "text": "Minimize network exposure for all control system devices and/or systems, ensuring they are not accessible from the internet.",
        "title": "Recommended Practices"
      },
      {
        "category": "general",
        "text": "Locate control system networks and remote devices behind firewalls and isolating them from business networks.",
        "title": "Recommended Practices"
      },
      {
        "category": "general",
        "text": "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 current version available. Also recognize VPN is only as secure as the connected devices.",
        "title": "Recommended Practices"
      },
      {
        "category": "general",
        "text": "CISA reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures.",
        "title": "Recommended Practices"
      },
      {
        "category": "general",
        "text": "CISA also provides a section for control systems security recommended practices on the ICS webpage on cisa.gov/ics. 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.",
        "title": "Recommended Practices"
      },
      {
        "category": "general",
        "text": "CISA encourages organizations to implement recommended cybersecurity strategies for proactive defense of ICS assets.",
        "title": "Recommended Practices"
      },
      {
        "category": "general",
        "text": "Additional mitigation guidance and recommended practices are publicly available on the ICS webpage at cisa.gov/ics in the technical information paper, ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation Strategies.",
        "title": "Recommended Practices"
      },
      {
        "category": "general",
        "text": "Organizations observing suspected malicious activity should follow established internal procedures and report findings to CISA for tracking and correlation against other incidents.",
        "title": "Recommended Practices"
      },
      {
        "category": "general",
        "text": "No known public exploitation specifically targeting this vulnerability has been reported to CISA at this time. This vulnerability has a high attack complexity.",
        "title": "Recommended Practices"
      }
    ],
    "publisher": {
      "category": "coordinator",
      "contact_details": "central@cisa.dhs.gov",
      "name": "CISA",
      "namespace": "https://www.cisa.gov/"
    },
    "references": [
      {
        "category": "self",
        "summary": "ICS Advisory ICSA-25-266-02 JSON",
        "url": "https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/OT/white/2025/icsa-25-266-02.json"
      },
      {
        "category": "self",
        "summary": "ICSA Advisory ICSA-25-266-02 - Web Version",
        "url": "https://www.cisa.gov/news-events/ics-advisories/icsa-25-266-02"
      },
      {
        "category": "external",
        "summary": "Recommended Practices",
        "url": "https://www.cisa.gov/uscert/ics/alerts/ICS-ALERT-10-301-01"
      },
      {
        "category": "external",
        "summary": "Recommended Practices",
        "url": "https://www.cisa.gov/resources-tools/resources/ics-recommended-practices"
      },
      {
        "category": "external",
        "summary": "Recommended Practices",
        "url": "https://www.cisa.gov/sites/default/files/publications/Cybersecurity_Best_Practices_for_Industrial_Control_Systems.pdf"
      },
      {
        "category": "external",
        "summary": "Recommended Practices",
        "url": "https://www.cisa.gov/topics/industrial-control-systems"
      },
      {
        "category": "external",
        "summary": "Recommended Practices",
        "url": "https://us-cert.cisa.gov/sites/default/files/recommended_practices/NCCIC_ICS-CERT_Defense_in_Depth_2016_S508C.pdf"
      },
      {
        "category": "external",
        "summary": "Recommended Practices",
        "url": "https://www.cisa.gov/uscert/ics/tips/ICS-TIP-12-146-01B"
      },
      {
        "category": "external",
        "summary": "Recommended Practices",
        "url": "https://www.cisa.gov/uscert/sites/default/files/publications/emailscams0905.pdf"
      },
      {
        "category": "external",
        "summary": "Recommended Practices",
        "url": "https://www.cisa.gov/uscert/ncas/tips/ST04-014"
      }
    ],
    "title": "Mitsubishi Electric MELSEC-Q Series CPU Module",
    "tracking": {
      "current_release_date": "2025-09-23T06:00:00.000000Z",
      "generator": {
        "date": "2025-09-23T15:26:30.983203Z",
        "engine": {
          "name": "CISA CSAF Generator",
          "version": "1.0.0"
        }
      },
      "id": "ICSA-25-266-02",
      "initial_release_date": "2025-09-23T06:00:00.000000Z",
      "revision_history": [
        {
          "date": "2025-09-23T06:00:00.000000Z",
          "legacy_version": "Initial",
          "number": "1",
          "summary": "Initial Publication"
        }
      ],
      "status": "final",
      "version": "1"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "\u003e=The_first_5_digits_of_serial_No._\u002724082\u0027|\u003c\u002727081\u0027",
                "product": {
                  "name": "Mitsubishi Electric MELSEC-Q Series Q03UDVCPU: \u003e=The_first_5_digits_of_serial_No._\u002724082\u0027|\u003c\u002727081\u0027",
                  "product_id": "CSAFPID-0001"
                }
              }
            ],
            "category": "product_name",
            "name": "MELSEC-Q Series Q03UDVCPU"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "\u003e=The_first_5_digits_of_serial_No._\u002724082\u0027|\u003c\u002727081\u0027",
                "product": {
                  "name": "Mitsubishi Electric MELSEC-Q Series Q04UDVCPU: \u003e=The_first_5_digits_of_serial_No._\u002724082\u0027|\u003c\u002727081\u0027",
                  "product_id": "CSAFPID-0002"
                }
              }
            ],
            "category": "product_name",
            "name": "MELSEC-Q Series Q04UDVCPU"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "\u003e=The_first_5_digits_of_serial_No._\u002724082\u0027|\u003c\u002727081\u0027",
                "product": {
                  "name": "Mitsubishi Electric MELSEC-Q Series Q06UDVCPU: \u003e=The_first_5_digits_of_serial_No._\u002724082\u0027|\u003c\u002727081\u0027",
                  "product_id": "CSAFPID-0003"
                }
              }
            ],
            "category": "product_name",
            "name": "MELSEC-Q Series Q06UDVCPU"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "\u003e=The_first_5_digits_of_serial_No._\u002724082\u0027|\u003c\u002727081\u0027",
                "product": {
                  "name": "Mitsubishi Electric MELSEC-Q Series Q13UDVCPU: \u003e=The_first_5_digits_of_serial_No._\u002724082\u0027|\u003c\u002727081\u0027",
                  "product_id": "CSAFPID-0004"
                }
              }
            ],
            "category": "product_name",
            "name": "MELSEC-Q Series Q13UDVCPU"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "\u003e=The_first_5_digits_of_serial_No._\u002724082\u0027|\u003c\u002727081\u0027",
                "product": {
                  "name": "Mitsubishi Electric MELSEC-Q Series Q26UDVCPU: \u003e=The_first_5_digits_of_serial_No._\u002724082\u0027|\u003c\u002727081\u0027",
                  "product_id": "CSAFPID-0005"
                }
              }
            ],
            "category": "product_name",
            "name": "MELSEC-Q Series Q26UDVCPU"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "\u003e=The_first_5_digits_of_serial_No._\u002724082\u0027|\u003c\u002727081\u0027",
                "product": {
                  "name": "Mitsubishi Electric MELSEC-Q Series Q04UDPVCPU: \u003e=The_first_5_digits_of_serial_No._\u002724082\u0027|\u003c\u002727081\u0027",
                  "product_id": "CSAFPID-0006"
                }
              }
            ],
            "category": "product_name",
            "name": "MELSEC-Q Series Q04UDPVCPU"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "\u003e=The_first_5_digits_of_serial_No._\u002724082\u0027|\u003c\u002727081\u0027",
                "product": {
                  "name": "Mitsubishi Electric MELSEC-Q Series Q06UDPVCPU: \u003e=The_first_5_digits_of_serial_No._\u002724082\u0027|\u003c\u002727081\u0027",
                  "product_id": "CSAFPID-0007"
                }
              }
            ],
            "category": "product_name",
            "name": "MELSEC-Q Series Q06UDPVCPU"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "\u003e=The_first_5_digits_of_serial_No._\u002724082\u0027|\u003c\u002727081\u0027",
                "product": {
                  "name": "Mitsubishi Electric MELSEC-Q Series Q13UDPVCPU: \u003e=The_first_5_digits_of_serial_No._\u002724082\u0027|\u003c\u002727081\u0027",
                  "product_id": "CSAFPID-0008"
                }
              }
            ],
            "category": "product_name",
            "name": "MELSEC-Q Series Q13UDPVCPU"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "\u003e=The_first_5_digits_of_serial_No._\u002724082\u0027|\u003c\u002727081\u0027",
                "product": {
                  "name": "Mitsubishi Electric MELSEC-Q Series Q26UDPVCPU: \u003e=The_first_5_digits_of_serial_No._\u002724082\u0027|\u003c\u002727081\u0027",
                  "product_id": "CSAFPID-0009"
                }
              }
            ],
            "category": "product_name",
            "name": "MELSEC-Q Series Q26UDPVCPU"
          }
        ],
        "category": "vendor",
        "name": "Mitsubishi Electric"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2025-8531",
      "cwe": {
        "id": "CWE-130",
        "name": "Improper Handling of Length Parameter Inconsistency"
      },
      "notes": [
        {
          "category": "summary",
          "text": "A Denial-of-Service (DoS) vulnerability exists in the MELSEC-Q series CPU module when the user authentication function is enabled, due to improper handling of length parameter inconsistency.",
          "title": "Vulnerability Summary"
        }
      ],
      "product_status": {
        "known_affected": [
          "CSAFPID-0001",
          "CSAFPID-0002",
          "CSAFPID-0003",
          "CSAFPID-0004",
          "CSAFPID-0005",
          "CSAFPID-0006",
          "CSAFPID-0007",
          "CSAFPID-0008",
          "CSAFPID-0009"
        ]
      },
      "references": [
        {
          "category": "external",
          "summary": "www.cve.org",
          "url": "https://www.cve.org/CVERecord?id=CVE-2025-8531"
        },
        {
          "category": "external",
          "summary": "www.first.org",
          "url": "https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:H"
        }
      ],
      "remediations": [
        {
          "category": "mitigation",
          "details": "Mitsubishi Electric has released the fixed version as shown below, but updating the product to the fixed version is currently unavailable. Consider migrating to the successor model, MELSEC iQ-R Series.",
          "product_ids": [
            "CSAFPID-0001",
            "CSAFPID-0002",
            "CSAFPID-0003",
            "CSAFPID-0004",
            "CSAFPID-0005",
            "CSAFPID-0006",
            "CSAFPID-0007",
            "CSAFPID-0008",
            "CSAFPID-0009"
          ]
        },
        {
          "category": "mitigation",
          "details": "MELSEC-QSeries Q03UDVCPU: The first 5 digits of serial No. \u002727082\u0027 or later.",
          "product_ids": [
            "CSAFPID-0001"
          ]
        },
        {
          "category": "mitigation",
          "details": "MELSEC-QSeries Q04UDVCPU: The first 5 digits of serial No. \u002727082\u0027 or later.",
          "product_ids": [
            "CSAFPID-0002"
          ]
        },
        {
          "category": "mitigation",
          "details": "MELSEC-QSeries Q06UDVCPU: The first 5 digits of serial No. \u002727082\u0027 or later.",
          "product_ids": [
            "CSAFPID-0003"
          ]
        },
        {
          "category": "mitigation",
          "details": "MELSEC-QSeries Q13UDVCPU: The first 5 digits of serial No. \u002727082\u0027 or later.",
          "product_ids": [
            "CSAFPID-0004"
          ]
        },
        {
          "category": "mitigation",
          "details": "MELSEC-QSeries Q26UDVCPU: The first 5 digits of serial No. \u002727082\u0027 or later.",
          "product_ids": [
            "CSAFPID-0005"
          ]
        },
        {
          "category": "mitigation",
          "details": "MELSEC-QSeries Q04UDPVCPU: The first 5 digits of serial No. \u002727082\u0027 or later.",
          "product_ids": [
            "CSAFPID-0006"
          ]
        },
        {
          "category": "mitigation",
          "details": "MELSEC-QSeries Q06UDPVCPU: The first 5 digits of serial No. \u002727082\u0027 or later.",
          "product_ids": [
            "CSAFPID-0007"
          ]
        },
        {
          "category": "mitigation",
          "details": "MELSEC-QSeries Q13UDPVCPU: The first 5 digits of serial No. \u002727082\u0027 or later.",
          "product_ids": [
            "CSAFPID-0008"
          ]
        },
        {
          "category": "mitigation",
          "details": "MELSEC-QSeries Q26UDPVCPU: The first 5 digits of serial No. \u002727082\u0027 or later.",
          "product_ids": [
            "CSAFPID-0009"
          ]
        },
        {
          "category": "mitigation",
          "details": "Mitsubishi Electric recommends users employ the following mitigation measures to minimize the risk of vulnerability exploit.",
          "product_ids": [
            "CSAFPID-0001",
            "CSAFPID-0002",
            "CSAFPID-0003",
            "CSAFPID-0004",
            "CSAFPID-0005",
            "CSAFPID-0006",
            "CSAFPID-0007",
            "CSAFPID-0008",
            "CSAFPID-0009"
          ]
        },
        {
          "category": "mitigation",
          "details": "Use a firewall or virtual private network (VPN), etc. to prevent unauthorized access when Internet access is required.",
          "product_ids": [
            "CSAFPID-0001",
            "CSAFPID-0002",
            "CSAFPID-0003",
            "CSAFPID-0004",
            "CSAFPID-0005",
            "CSAFPID-0006",
            "CSAFPID-0007",
            "CSAFPID-0008",
            "CSAFPID-0009"
          ]
        },
        {
          "category": "mitigation",
          "details": "Use within a LAN and block access from untrusted networks and hosts through firewalls.",
          "product_ids": [
            "CSAFPID-0001",
            "CSAFPID-0002",
            "CSAFPID-0003",
            "CSAFPID-0004",
            "CSAFPID-0005",
            "CSAFPID-0006",
            "CSAFPID-0007",
            "CSAFPID-0008",
            "CSAFPID-0009"
          ]
        },
        {
          "category": "mitigation",
          "details": "Restrict physical access to the affected products, as well as to computers and network devices that can be connected to those products.",
          "product_ids": [
            "CSAFPID-0001",
            "CSAFPID-0002",
            "CSAFPID-0003",
            "CSAFPID-0004",
            "CSAFPID-0005",
            "CSAFPID-0006",
            "CSAFPID-0007",
            "CSAFPID-0008",
            "CSAFPID-0009"
          ]
        },
        {
          "category": "mitigation",
          "details": "See Mitsubishi Electric\u0027s security bulletin for more information.",
          "product_ids": [
            "CSAFPID-0001",
            "CSAFPID-0002",
            "CSAFPID-0003",
            "CSAFPID-0004",
            "CSAFPID-0005",
            "CSAFPID-0006",
            "CSAFPID-0007",
            "CSAFPID-0008",
            "CSAFPID-0009"
          ],
          "url": "https://www.mitsubishielectric.com/psirt/vulnerability/pdf/2025-013_en.pdf"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 6.8,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:H",
            "version": "3.1"
          },
          "products": [
            "CSAFPID-0001",
            "CSAFPID-0002",
            "CSAFPID-0003",
            "CSAFPID-0004",
            "CSAFPID-0005",
            "CSAFPID-0006",
            "CSAFPID-0007",
            "CSAFPID-0008",
            "CSAFPID-0009"
          ]
        }
      ]
    }
  ]
}


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