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CVE-2021-20674

Estado: ModificadaAlta (7.8)—

Una vulnerabilidad de ruta de búsqueda no confiable en el Instalador del programa distribuido MagicConnect Client versiones anteriores al 1 de marzo de 2021, permite a un atacante alcanzar privilegios y, por medio de una DLL de tipo caballo de Troya en un directorio no especificado, y ejecutar código arbitrario con el privilegio del usuario que invoca al instalador cuando es conectado a una terminal remoto usando el escritorio remoto

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (1)

Ntt-tx — Magicconnect

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2021-20674",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 6.8,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:M/Au:N/C:P/I:P/A:P",
          "authentication": "NONE",
          "integrityImpact": "PARTIAL",
          "accessComplexity": "MEDIUM",
          "availabilityImpact": "PARTIAL",
          "confidentialityImpact": "PARTIAL"
        },
        "acInsufInfo": false,
        "impactScore": 6.4,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 8.6,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": true
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 7.8,
          "attackVector": "LOCAL",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "REQUIRED",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 5.9,
        "exploitabilityScore": 1.8
      }
    ]
  },
  "affected": [
    {
      "source": "vultures@jpcert.or.jp",
      "affectedData": [
        {
          "vendor": "NTT TechnoCross Corporation",
          "product": "Installer of MagicConnect Client program",
          "versions": [
            {
              "status": "affected",
              "version": "distributed before 2021 March 1"
            }
          ]
        }
      ]
    }
  ],
  "published": "2021-03-12T02:15:13.163",
  "references": [
    {
      "url": "https://jvn.jp/en/jp/JVN18056666/index.html",
      "tags": [
        "Third Party Advisory"
      ],
      "source": "vultures@jpcert.or.jp"
    },
    {
      "url": "https://www.magicconnect.net/information/202103110900-2",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "vultures@jpcert.or.jp"
    },
    {
      "url": "https://jvn.jp/en/jp/JVN18056666/index.html",
      "tags": [
        "Third Party Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://www.magicconnect.net/information/202103110900-2",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-427"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Untrusted search path vulnerability in Installer of MagicConnect Client program distributed before 2021 March 1 allows an attacker to gain privileges and via a Trojan horse DLL in an unspecified directory and to execute arbitrary code with the privilege of the user invoking the installer when a terminal is connected remotely using Remote desktop."
    },
    {
      "lang": "es",
      "value": "Una vulnerabilidad de ruta de búsqueda no confiable en el Instalador del programa distribuido MagicConnect Client versiones anteriores al 1 de marzo de 2021, permite a un atacante alcanzar privilegios y, por medio de una DLL de tipo caballo de Troya en un directorio no especificado, y ejecutar código arbitrario con el privilegio del usuario que invoca al instalador cuando es conectado a una terminal remoto usando el escritorio remoto"
    }
  ],
  "lastModified": "2026-06-17T03:34:13.557",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:ntt-tx:magicconnect:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "5E3E5BFF-E01D-4D14-9925-D24292C89FAC",
              "versionEndExcluding": "2021-03-01"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "vultures@jpcert.or.jp"
}