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CVE-2021-20251

Estado: ModificadaMedia (5.9)—

A flaw was found in samba. A race condition in the password lockout code may lead to the risk of brute force attacks being successful if special conditions are met.

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 (2)

Fedoraproject — FedoraSamba — Samba

CWE

Referencias

JSON original (NVD)

Mostrar
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  "id": "CVE-2021-20251",
  "cveTags": [],
  "metrics": {
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        "ssvcData": {
          "id": "CVE-2021-20251",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2025-03-06T15:49:41.866529Z"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 5.9,
          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "HIGH",
          "availabilityImpact": "NONE",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 2.2
      }
    ]
  },
  "affected": [
    {
      "source": "secalert@redhat.com",
      "affectedData": [
        {
          "vendor": "n/a",
          "product": "samba",
          "versions": [
            {
              "status": "affected",
              "version": "Samba 4.1 and newer"
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  ],
  "published": "2023-03-06T23:15:10.387",
  "references": [
    {
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1929800",
      "tags": [
        "Issue Tracking",
        "Third Party Advisory"
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      "source": "secalert@redhat.com"
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    },
    {
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      "source": "secalert@redhat.com"
    },
    {
      "url": "https://security.netapp.com/advisory/ntap-20230331-0005/",
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
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      "tags": [
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  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "secalert@redhat.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-362"
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      ]
    },
    {
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      "source": "nvd@nist.gov",
      "description": [
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          "lang": "en",
          "value": "CWE-362"
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  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "A flaw was found in samba. A race condition in the password lockout code may lead to the risk of brute force attacks being successful if special conditions are met."
    },
    {
      "lang": "es",
      "value": "Se ha encontrado un fallo en samba. Una condición de ejecución en el código de bloqueo de contraseñas puede conllevar el riesgo de que los ataques de fuerza bruta tengan éxito si se cumplen unas condiciones especiales."
    }
  ],
  "lastModified": "2026-06-17T03:33:32.787",
  "configurations": [
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