« Volver al listado

CVE-2026-34119

Estado: AnalizadaAlta (7.1)—

A heap-based buffer overflow vulnerability was identified in TP-Link Tapo C520WS v2.6 within the HTTP parsing loop when appending segmented request bodies without continuous write‑boundary verification, due to insufficient boundary validation when handling externally supplied HTTP input.  An attacker on the same network segment could trigger heap memory corruption conditions by sending crafted payloads that cause write operations beyond allocated buffer boundaries.  Successful exploitation causes a Denial-of-Service (DoS) condition, causing the device’s process to crash or become unresponsive.

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.

AV:A (red adyacente), sin privilegios, sin interacción: T1210. El buffer overflow en parsing HTTP causa DoS (crash/proceso inresponsivo): T1499.004 (endpoint denial of service).

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

Vulnerability ScanningThreat Intelligence ProgramPrivileged Account ManagementNetwork SegmentationFilter Network TrafficDisable or Remove Feature or Program

Tecnologías afectadas (1)

Tp-link — Tapo C520ws Firmware

CWE

Referencias

JSON original (NVD)

Mostrar
{
  "id": "CVE-2026-34119",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-34119",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-04-03T13:06:32.399642Z"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 6.5,
          "attackVector": "ADJACENT_NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:A/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"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 2.8
      }
    ],
    "cvssMetricV40": [
      {
        "type": "Secondary",
        "source": "f23511db-6c3e-4e32-a477-6aa17d310630",
        "cvssData": {
          "Safety": "NOT_DEFINED",
          "version": "4.0",
          "Recovery": "NOT_DEFINED",
          "baseScore": 7.1,
          "Automatable": "NOT_DEFINED",
          "attackVector": "ADJACENT",
          "baseSeverity": "HIGH",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
          "exploitMaturity": "NOT_DEFINED",
          "providerUrgency": "NOT_DEFINED",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "attackRequirements": "NONE",
          "privilegesRequired": "NONE",
          "subIntegrityImpact": "NONE",
          "vulnIntegrityImpact": "NONE",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "subAvailabilityImpact": "NONE",
          "vulnAvailabilityImpact": "HIGH",
          "availabilityRequirement": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "subConfidentialityImpact": "NONE",
          "vulnConfidentialityImpact": "NONE",
          "confidentialityRequirement": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "vulnerabilityResponseEffort": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED"
        }
      }
    ]
  },
  "affected": [
    {
      "source": "f23511db-6c3e-4e32-a477-6aa17d310630",
      "affectedData": [
        {
          "vendor": "TP-Link Systems Inc.",
          "modules": [
            "HTTP Parsing Loop"
          ],
          "product": "Tapo C520WS v2.6",
          "versions": [
            {
              "status": "affected",
              "version": "0",
              "lessThan": "1.2.4 Build 260326 Rel.24666n",
              "versionType": "custom"
            }
          ],
          "defaultStatus": "unaffected"
        }
      ]
    }
  ],
  "published": "2026-04-02T18:16:28.680",
  "references": [
    {
      "url": "https://www.tp-link.com/en/support/download/tapo-c520ws/#Firmware-Release-Notes",
      "tags": [
        "Release Notes"
      ],
      "source": "f23511db-6c3e-4e32-a477-6aa17d310630"
    },
    {
      "url": "https://www.tp-link.com/us/support/download/tapo-c520ws/#Firmware-Release-Notes",
      "tags": [
        "Release Notes"
      ],
      "source": "f23511db-6c3e-4e32-a477-6aa17d310630"
    },
    {
      "url": "https://www.tp-link.com/us/support/faq/5047/",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "f23511db-6c3e-4e32-a477-6aa17d310630"
    }
  ],
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "f23511db-6c3e-4e32-a477-6aa17d310630",
      "description": [
        {
          "lang": "en",
          "value": "CWE-122"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "A heap-based buffer overflow vulnerability was identified in TP-Link Tapo C520WS v2.6 within the HTTP parsing\nloop\nwhen appending segmented request bodies without\ncontinuous write‑boundary verification, due to insufficient boundary validation when handling externally supplied HTTP input.  An attacker\non the same network segment could trigger heap memory corruption conditions by\nsending crafted payloads that cause write operations beyond allocated buffer\nboundaries.  Successful exploitation\ncauses a Denial-of-Service (DoS) condition, causing the device’s process to\ncrash or become unresponsive."
    },
    {
      "lang": "es",
      "value": "Una vulnerabilidad de desbordamiento de búfer basado en montículo fue identificada en TP-Link Tapo C520WS v2.6 dentro del bucle de análisis HTTP al adjuntar cuerpos de solicitud segmentados sin verificación continua de límites de escritura, debido a una validación de límites insuficiente al manejar entrada HTTP suministrada externamente. Un atacante en el mismo segmento de red podría desencadenar condiciones de corrupción de memoria del montículo al enviar cargas útiles manipuladas que causan operaciones de escritura más allá de los límites del búfer asignado. La explotación exitosa causa una condición de Denegación de Servicio (DoS), haciendo que el proceso del dispositivo se bloquee o deje de responder."
    }
  ],
  "lastModified": "2026-07-24T21:10:00.143",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:tp-link:tapo_c520ws_firmware:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "710DD89A-E94F-4371-A03F-698C2F61D9C1",
              "versionEndExcluding": "1.2.4"
            }
          ],
          "operator": "OR"
        },
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:h:tp-link:tapo_c520ws:2.6:*:*:*:*:*:*:*",
              "vulnerable": false,
              "matchCriteriaId": "72666951-E72F-4494-9A90-1F0B22E2F3CD"
            }
          ],
          "operator": "OR"
        }
      ],
      "operator": "AND"
    }
  ],
  "sourceIdentifier": "f23511db-6c3e-4e32-a477-6aa17d310630"
}