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CVE-2021-27941

Estado: ModificadaMedia (4.6)—

Unconstrained Web access to the device's private encryption key in the QR code pairing mode in the eWeLink mobile application (through 4.9.2 on Android and through 4.9.1 on iOS) allows a physically proximate attacker to eavesdrop on Wi-Fi credentials and other sensitive information by monitoring the Wi-Fi spectrum during a device pairing process.

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)

Coolkit — Ewelink

CWE

Referencias

JSON original (NVD)

Mostrar
{
  "id": "CVE-2021-27941",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 2.1,
          "accessVector": "LOCAL",
          "vectorString": "AV:L/AC:L/Au:N/C:P/I:N/A:N",
          "authentication": "NONE",
          "integrityImpact": "NONE",
          "accessComplexity": "LOW",
          "availabilityImpact": "NONE",
          "confidentialityImpact": "PARTIAL"
        },
        "acInsufInfo": false,
        "impactScore": 2.9,
        "baseSeverity": "LOW",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 3.9,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 4.6,
          "attackVector": "PHYSICAL",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 0.9
      }
    ]
  },
  "affected": [
    {
      "source": "cve@mitre.org",
      "affectedData": [
        {
          "vendor": "n/a",
          "product": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "n/a"
            }
          ]
        }
      ]
    }
  ],
  "published": "2021-05-06T21:15:07.597",
  "references": [
    {
      "url": "https://apps.apple.com/us/app/ewelink-smart-home/id1035163158",
      "tags": [
        "Product",
        "Third Party Advisory"
      ],
      "source": "cve@mitre.org"
    },
    {
      "url": "https://github.com/salgio/eWeLink-QR-Code",
      "tags": [
        "Third Party Advisory"
      ],
      "source": "cve@mitre.org"
    },
    {
      "url": "https://play.google.com/store/apps/details?id=com.coolkit&hl=en_US",
      "tags": [
        "Product",
        "Third Party Advisory"
      ],
      "source": "cve@mitre.org"
    },
    {
      "url": "https://apps.apple.com/us/app/ewelink-smart-home/id1035163158",
      "tags": [
        "Product",
        "Third Party Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://github.com/salgio/eWeLink-QR-Code",
      "tags": [
        "Third Party Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://play.google.com/store/apps/details?id=com.coolkit&hl=en_US",
      "tags": [
        "Product",
        "Third Party Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-522"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Unconstrained Web access to the device's private encryption key in the QR code pairing mode in the eWeLink mobile application (through 4.9.2 on Android and through 4.9.1 on iOS) allows a physically proximate attacker to eavesdrop on Wi-Fi credentials and other sensitive information by monitoring the Wi-Fi spectrum during a device pairing process."
    },
    {
      "lang": "es",
      "value": "El acceso web sin restricciones a la clave de cifrado privada del dispositivo en el modo de emparejamiento de código QR en la aplicación móvil eWeLink (versiones  hasta.9.2 en Android y versiones hasta.9.1 en iOS) permite a un atacante físicamente próximo espiar las credenciales de Wi-Fi y otras información mediante el seguimiento del espectro de Wi-Fi durante un proceso de emparejamiento de dispositivos"
    }
  ],
  "lastModified": "2026-06-17T03:45:38.880",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:coolkit:ewelink:*:*:*:*:*:iphone_os:*:*",
              "vulnerable": true,
              "matchCriteriaId": "3C19C39C-9C55-4C57-8BF2-C32E843249E5",
              "versionEndIncluding": "4.9.1"
            },
            {
              "criteria": "cpe:2.3:a:coolkit:ewelink:*:*:*:*:*:android:*:*",
              "vulnerable": true,
              "matchCriteriaId": "6198F9C4-23C8-46B3-9100-B96C60407F1C",
              "versionEndIncluding": "4.9.2"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "cve@mitre.org"
}