« Back to list

CVE-2020-5546

Status: ModifiedHigh (8.8)—

Improper Neutralization of Argument Delimiters in a Command ('Argument Injection') vulnerability in TCP function included in the firmware of Mitsubishi Electric MELQIC IU1 series IU1-1M20-D firmware version 1.0.7 and earlier allows an attacker on the same network segment to stop the network functions or execute malware via a specially crafted packet.

CVSS

Exploitation probability (EPSS)

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

Affected technologies (1)

Mitsubishielectric — Iu1-1m20-d Firmware

CWEs

References

Raw JSON (NVD)

Show
{
  "id": "CVE-2020-5546",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 5.8,
          "accessVector": "ADJACENT_NETWORK",
          "vectorString": "AV:A/AC:L/Au:N/C:P/I:P/A:P",
          "authentication": "NONE",
          "integrityImpact": "PARTIAL",
          "accessComplexity": "LOW",
          "availabilityImpact": "PARTIAL",
          "confidentialityImpact": "PARTIAL"
        },
        "acInsufInfo": false,
        "impactScore": 6.4,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 6.5,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 8.8,
          "attackVector": "ADJACENT_NETWORK",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 5.9,
        "exploitabilityScore": 2.8
      }
    ]
  },
  "affected": [
    {
      "source": "vultures@jpcert.or.jp",
      "affectedData": [
        {
          "vendor": "Mitsubishi Electric Corporation",
          "product": "Mitsubishi Electric MELQIC IU1 series",
          "versions": [
            {
              "status": "affected",
              "version": "IU1-1M20-D firmware version 1.0.7 and earlier"
            }
          ]
        }
      ]
    }
  ],
  "published": "2020-03-16T02:15:11.120",
  "references": [
    {
      "url": "https://jvn.jp/en/vu/JVNVU92370624/index.html",
      "tags": [
        "Third Party Advisory"
      ],
      "source": "vultures@jpcert.or.jp"
    },
    {
      "url": "https://www.mitsubishielectric.co.jp/psirt/vulnerability/pdf/2019-004.pdf",
      "tags": [
        "Patch",
        "Vendor Advisory"
      ],
      "source": "vultures@jpcert.or.jp"
    },
    {
      "url": "https://jvn.jp/en/vu/JVNVU92370624/index.html",
      "tags": [
        "Third Party Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://www.mitsubishielectric.co.jp/psirt/vulnerability/pdf/2019-004.pdf",
      "tags": [
        "Patch",
        "Vendor Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-88"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Improper Neutralization of Argument Delimiters in a Command ('Argument Injection') vulnerability in TCP function included in the firmware of Mitsubishi Electric MELQIC IU1 series IU1-1M20-D firmware version 1.0.7 and earlier allows an attacker on the same network segment to stop the network functions or execute malware via a specially crafted packet."
    },
    {
      "lang": "es",
      "value": "Una vulnerabilidad de Neutralización Inapropiada de Delimitadores de Argumento en un Comando (\"Argument Injection\") en una función  TCP incluida en el firmware de Mitsubishi Electric MELQIC IU1 serie IU1-1M20-D versiones de firmware 1.0.7 y anteriores, permite a un atacante en el mismo segmento de red detener las funciones de red o ejecutar malware por medio de un paquete especialmente diseñado."
    }
  ],
  "lastModified": "2026-06-17T03:21:34.713",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:mitsubishielectric:iu1-1m20-d_firmware:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "B6DAFF78-70E2-42CF-A386-73BB42992262",
              "versionEndIncluding": "1.0.7"
            }
          ],
          "operator": "OR"
        },
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:h:mitsubishielectric:iu1-1m20-d:-:*:*:*:*:*:*:*",
              "vulnerable": false,
              "matchCriteriaId": "680B7B83-9F76-4C1F-B87A-F7049A0C46E4"
            }
          ],
          "operator": "OR"
        }
      ],
      "operator": "AND"
    }
  ],
  "sourceIdentifier": "vultures@jpcert.or.jp"
}