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CVE-2021-47854

Estado: AplazadaAlta (8.7)—

DD-WRT version 45723 contains a buffer overflow vulnerability in the UPNP network discovery service that allows remote attackers to potentially execute arbitrary code. Attackers can send crafted M-SEARCH packets with oversized UUID payloads to trigger buffer overflow conditions on the target device.

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).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

Vulnerabilidad de buffer overflow en servicio UPNP remoto sin autenticación (AV:N/PR:N/UI:N). Permite ejecución arbitraria de código mediante paquetes M-SEARCH malformados. El impacto secundario de DoS es potencial por naturaleza del desbordamiento.

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Privileged Account ManagementFilter Network TrafficVulnerability ScanningRestrict Web-Based ContentNetwork SegmentationLimit Software Installation

Tecnologías afectadas (1)

⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.

Dd-wrt — Dd-wrtAI

CWE

Referencias

JSON original (NVD)

Mostrar
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  "id": "CVE-2021-47854",
  "cveTags": [],
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        "ssvcData": {
          "id": "CVE-2021-47854",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "poc"
            },
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              "automatable": "yes"
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            {
              "technicalImpact": "total"
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          "version": "2.0.3",
          "timestamp": "2026-01-22T15:11:46.923237Z"
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          "integrityImpact": "HIGH",
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      }
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      {
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          "Automatable": "NOT_DEFINED",
          "attackVector": "NETWORK",
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          "valueDensity": "NOT_DEFINED",
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          "vulnIntegrityImpact": "NONE",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
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          "modifiedUserInteraction": "NOT_DEFINED",
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          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "vulnerabilityResponseEffort": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED"
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  "affected": [
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      "affectedData": [
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          "product": "DD-WRT",
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  "published": "2026-01-21T18:16:15.003",
  "references": [
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      "url": "https://dd-wrt.com/",
      "source": "disclosure@vulncheck.com"
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    {
      "url": "https://download1.dd-wrt.com/dd-wrtv2/downloads/betas/2021/",
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    {
      "url": "https://ssd-disclosure.com/ssd-advisory-dd-wrt-upnp-buffer-overflow/",
      "source": "disclosure@vulncheck.com"
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    {
      "url": "https://www.exploit-db.com/exploits/49730",
      "source": "disclosure@vulncheck.com"
    },
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      "url": "https://www.vulncheck.com/advisories/dd-wrt-upnp-buffer-overflow",
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      "description": [
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          "value": "CWE-120"
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      "lang": "en",
      "value": "DD-WRT version 45723 contains a buffer overflow vulnerability in the UPNP network discovery service that allows remote attackers to potentially execute arbitrary code. Attackers can send crafted M-SEARCH packets with oversized UUID payloads to trigger buffer overflow conditions on the target device."
    },
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      "lang": "es",
      "value": "La versión 45723 de DD-WRT contiene una vulnerabilidad de desbordamiento de búfer en el servicio de descubrimiento de red UPNP que permite a atacantes remotos ejecutar potencialmente código arbitrario. Los atacantes pueden enviar paquetes M-SEARCH manipulados con cargas útiles UUID de tamaño excesivo para desencadenar condiciones de desbordamiento de búfer en el dispositivo objetivo."
    }
  ],
  "lastModified": "2026-06-17T04:18:38.093",
  "sourceIdentifier": "disclosure@vulncheck.com"
}