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CVE-2021-3505

Estado: ModificadaMedia (5.5)—

A flaw was found in libtpms in versions before 0.8.0. The TPM 2 implementation returns 2048 bit keys with ~1984 bit strength due to a bug in the TCG specification. The bug is in the key creation algorithm in RsaAdjustPrimeCandidate(), which is called before the prime number check. The highest threat from this vulnerability is to data confidentiality.

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 (3)

Fedoraproject — FedoraLibtpms Project — LibtpmsRedhat — Enterprise Linux

CWE

Referencias

JSON original (NVD)

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          "vectorString": "AV:L/AC:L/Au:N/C:P/I:N/A:N",
          "authentication": "NONE",
          "integrityImpact": "NONE",
          "accessComplexity": "LOW",
          "availabilityImpact": "NONE",
          "confidentialityImpact": "PARTIAL"
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        "acInsufInfo": false,
        "impactScore": 2.9,
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          "attackComplexity": "LOW",
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  "affected": [
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  "vulnStatus": "Modified",
  "weaknesses": [
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      "type": "Secondary",
      "source": "secalert@redhat.com",
      "description": [
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          "value": "CWE-331"
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      "value": "A flaw was found in libtpms in versions before 0.8.0. The TPM 2 implementation returns 2048 bit keys with ~1984 bit strength due to a bug in the TCG specification. The bug is in the key creation algorithm in RsaAdjustPrimeCandidate(), which is called before the prime number check. The highest threat from this vulnerability is to data confidentiality."
    },
    {
      "lang": "es",
      "value": "Se encontró un fallo en libtpms en versiones anteriores a 0.8.0. La implementación de TPM 2 devuelve claves de 2048 bits con una intensidad de bits de ~1984 debido a un error en la especificación TCG. El error está en el algoritmo de creación de claves en la función RsaAdjustPrimeCandidate(), que es llamado antes de la comprobación del número primo. La mayor amenaza de esta vulnerabilidad es la confidencialidad de los datos"
    }
  ],
  "lastModified": "2026-06-17T04:05:15.063",
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