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CVE-2026-3549

Estado: AnalizadaAlta (8.3)—

Heap Overflow in TLS 1.3 ECH parsing. An integer underflow existed in ECH extension parsing logic when calculating a buffer length, which resulted in writing beyond the bounds of an allocated buffer. Note that in wolfSSL, ECH is off by default, and the ECH standard is still evolving.

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:N permite explotación remota sin privilegios (T1190). Heap overflow en parseo ECH de TLS 1.3 permite ejecución de código remoto (T1059) con alta disponibilidad de la aplicación (VA:H), aunque ECH está deshabilitado por defecto.

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 ManagementVulnerability ScanningRestrict Web-Based ContentNetwork SegmentationLimit Software InstallationLimit Access to Resource Over Network

Tecnologías afectadas (1)

Wolfssl — Wolfssl

CWE

Referencias

JSON original (NVD)

Mostrar
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  "id": "CVE-2026-3549",
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          "id": "CVE-2026-3549",
          "role": "CISA Coordinator",
          "options": [
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              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
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              "technicalImpact": "total"
            }
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          "version": "2.0.3",
          "timestamp": "2026-03-24T01:37:47.102762Z"
        }
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        "source": "nvd@nist.gov",
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          "baseScore": 9.8,
          "attackVector": "NETWORK",
          "baseSeverity": "CRITICAL",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
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          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "HIGH"
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    ],
    "cvssMetricV40": [
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        "type": "Secondary",
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        "cvssData": {
          "Safety": "NOT_DEFINED",
          "version": "4.0",
          "Recovery": "NOT_DEFINED",
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          "attackVector": "NETWORK",
          "baseSeverity": "HIGH",
          "valueDensity": "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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      "affectedData": [
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          "product": "wolfSSL",
          "versions": [
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              "version": "0",
              "lessThan": "5.9.0",
              "versionType": "semver"
            }
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        }
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  ],
  "published": "2026-03-19T21:17:12.823",
  "references": [
    {
      "url": "https://github.com/wolfSSL/wolfssl/pull/9817",
      "tags": [
        "Issue Tracking",
        "Patch"
      ],
      "source": "facts@wolfssl.com"
    }
  ],
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "facts@wolfssl.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-122"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Heap Overflow in TLS 1.3 ECH parsing. An integer underflow existed in ECH extension parsing logic when calculating a buffer length, which resulted in writing beyond the bounds of an allocated buffer. Note that in wolfSSL, ECH is off by default, and the ECH standard is still evolving."
    },
    {
      "lang": "es",
      "value": "Desbordamiento de montículo en el análisis de ECH de TLS 1.3. Existía un desbordamiento negativo de enteros en la lógica de análisis de la extensión ECH al calcular la longitud de un búfer, lo que resultó en la escritura más allá de los límites de un búfer asignado. Tenga en cuenta que en wolfSSL, ECH está desactivado por defecto, y el estándar ECH aún está evolucionando."
    }
  ],
  "lastModified": "2026-06-17T10:43:46.210",
  "configurations": [
    {
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        {
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}