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CVE-2021-29294

Estado: ModificadaAlta (7.5)—

Null Pointer Dereference vulnerability exists in D-Link DSL-2740R UK_1.01, which could let a remove malicious user cause a denial of service via the send_hnap_unauthorized function. It could be triggered by sending crafted POST request to /HNAP1/. NOTE: The DSL-2740R and all hardware revisions are considered End of Life and as such this issue will not be patched

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)

Dlink — Dsl-2740r Firmware

CWE

Referencias

JSON original (NVD)

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  "id": "CVE-2021-29294",
  "cveTags": [
    {
      "tags": [
        "unsupported-when-assigned"
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      "sourceIdentifier": "cve@mitre.org"
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  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 5,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:P",
          "authentication": "NONE",
          "integrityImpact": "NONE",
          "accessComplexity": "LOW",
          "availabilityImpact": "PARTIAL",
          "confidentialityImpact": "NONE"
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        "acInsufInfo": false,
        "impactScore": 2.9,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 10,
        "obtainUserPrivilege": false,
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          "attackVector": "NETWORK",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "NONE"
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        "impactScore": 3.6,
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  "affected": [
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      "source": "cve@mitre.org",
      "affectedData": [
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          "vendor": "n/a",
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  "published": "2021-08-10T20:15:08.457",
  "references": [
    {
      "url": "https://supportannouncement.us.dlink.com/announcement/publication.aspx?name=SAP10213",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "cve@mitre.org"
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      "url": "https://www.dlink.com/en/security-bulletin/",
      "tags": [
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    },
    {
      "url": "https://supportannouncement.us.dlink.com/announcement/publication.aspx?name=SAP10213",
      "tags": [
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://www.dlink.com/en/security-bulletin/",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-476"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Null Pointer Dereference vulnerability exists in D-Link DSL-2740R UK_1.01, which could let a remove malicious user cause a denial of service via the send_hnap_unauthorized function. It could be triggered by sending crafted POST request to /HNAP1/. NOTE: The DSL-2740R and all hardware revisions are considered End of Life and as such this issue will not be patched"
    },
    {
      "lang": "es",
      "value": "** NO COMPATIBLE CUANDO SE ASIGNÓ ** Se presenta una vulnerabilidad de Desreferencia de Puntero Null en D-Link DSL-2740R versión UK_1.01, que podría permitir a un usuario malicioso remoto causar una denegación de servicio por medio de la función send_hnap_unauthorized. Podría desencadenarse mediante el envío de una petición POST diseñada a /HNAP1/. NOTA: El DSL-2740R y todas las revisiones de hardware se consideran Fin de Vida y como tal, este problema no se parchea"
    }
  ],
  "lastModified": "2026-06-17T03:47:29.510",
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