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CVE-2021-42143

Estado: ModificadaCrítica (9.1)—

An issue was discovered in Contiki-NG tinyDTLS through master branch 53a0d97. An infinite loop bug exists during the handling of a ClientHello handshake message. This bug allows remote attackers to cause a denial of service by sending a malformed ClientHello handshake message with an odd length of cipher suites, which triggers an infinite loop (consuming all resources) and a buffer over-read that can disclose sensitive information.

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)

Contiki-ng — Tinydtls

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2021-42143",
  "cveTags": [],
  "metrics": {
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        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2021-42143",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2024-01-24T19:22:24.819809Z"
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    "cvssMetricV31": [
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          "baseSeverity": "CRITICAL",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "HIGH"
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        "impactScore": 5.2,
        "exploitabilityScore": 3.9
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  "published": "2024-01-24T18:15:08.080",
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  "vulnStatus": "Modified",
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  "descriptions": [
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      "value": "An issue was discovered in Contiki-NG tinyDTLS through master branch 53a0d97. An infinite loop bug exists during the handling of a ClientHello handshake message. This bug allows remote attackers to cause a denial of service by sending a malformed ClientHello handshake message with an odd length of cipher suites, which triggers an infinite loop (consuming all resources) and a buffer over-read that can disclose sensitive information."
    },
    {
      "lang": "es",
      "value": "Se descubrió un problema en Contiki-NG tinyDTLS a través de la rama maestra 53a0d97. Existe un error de bucle infinito durante el manejo de un mensaje de protocolo de enlace ClientHello. Este error permite a atacantes remotos provocar una denegación de servicio enviando un mensaje de protocolo de enlace ClientHello mal formado con una longitud impar de conjuntos de cifrado, lo que desencadena un bucle infinito (consumiendo todos los recursos) y una sobrelectura del búfer que puede revelar información confidencial."
    }
  ],
  "lastModified": "2026-06-17T04:09:25.390",
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  "sourceIdentifier": "cve@mitre.org"
}