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CVE-2025-21521

Estado: ModificadaAlta (7.5)—

Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: Thread Pooling). Supported versions that are affected are 8.0.39 and prior, 8.4.2 and prior and 9.0.1 and prior. Easily exploitable vulnerability allows unauthenticated attacker with network access via multiple protocols to compromise MySQL Server. Successful attacks of this vulnerability can result in unauthorized ability to cause a hang or frequently repeatable crash (complete DOS) of MySQL Server. CVSS 3.1 Base Score 7.5 (Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).

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.

Vulnerabilidad remota sin autenticación (AV:N, PR:N) en servicio MySQL expuesto; CWE-770 y descripción indican DoS por agotamiento de recursos (thread pooling hang/crash).

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

Filter Network TrafficVulnerability ScanningPrivileged Account ManagementNetwork SegmentationLimit Access to Resource Over NetworkApplication Isolation and Sandboxing

Tecnologías afectadas (1)

Oracle — Mysql Server

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2025-21521",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2025-21521",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2025-01-22T18:34:04.669398Z"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "secalert_us@oracle.com",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 7.5,
          "attackVector": "NETWORK",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:N/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": 3.9
      }
    ]
  },
  "affected": [
    {
      "source": "secalert_us@oracle.com",
      "affectedData": [
        {
          "cpes": [
            "cpe:2.3:a:oracle:mysql_server:8.0.39_and_prior:*:*:*:*:*:*:*",
            "cpe:2.3:a:oracle:mysql_server:8.4.2_and_prior:*:*:*:*:*:*:*",
            "cpe:2.3:a:oracle:mysql_server:9.0.1_and_prior:*:*:*:*:*:*:*"
          ],
          "vendor": "Oracle Corporation",
          "product": "MySQL Server",
          "versions": [
            {
              "status": "affected",
              "version": "*",
              "versionType": "custom",
              "lessThanOrEqual": "8.0.39"
            },
            {
              "status": "affected",
              "version": "*",
              "versionType": "custom",
              "lessThanOrEqual": "8.4.2"
            },
            {
              "status": "affected",
              "version": "*",
              "versionType": "custom",
              "lessThanOrEqual": "9.0.1"
            }
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  ],
  "published": "2025-01-21T21:15:17.663",
  "references": [
    {
      "url": "https://www.oracle.com/security-alerts/cpujan2025.html",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "secalert_us@oracle.com"
    },
    {
      "url": "https://security.netapp.com/advisory/ntap-20250124-0010/",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "description": [
        {
          "lang": "en",
          "value": "CWE-770"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: Thread Pooling).  Supported versions that are affected are 8.0.39 and prior, 8.4.2 and prior and  9.0.1 and prior. Easily exploitable vulnerability allows unauthenticated attacker with network access via multiple protocols to compromise MySQL Server.  Successful attacks of this vulnerability can result in unauthorized ability to cause a hang or frequently repeatable crash (complete DOS) of MySQL Server. CVSS 3.1 Base Score 7.5 (Availability impacts).  CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)."
    },
    {
      "lang": "es",
      "value": "Vulnerabilidad en el producto MySQL Server de Oracle MySQL (componente: Server: Thread Pooling). Las versiones compatibles afectadas son 8.0.39 y anteriores, 8.4.2 y anteriores y 9.0.1 y anteriores. Esta vulnerabilidad, que se puede explotar fácilmente, permite que un atacante no autenticado con acceso a la red a través de múltiples protocolos comprometa MySQL Server. Los ataques exitosos de esta vulnerabilidad pueden dar como resultado la capacidad no autorizada de provocar un bloqueo o un bloqueo frecuente y repetible (DOS completo) de MySQL Server. Puntuación base de CVSS 3.1: 7,5 (impactos en la disponibilidad). Vector CVSS: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)."
    }
  ],
  "lastModified": "2026-06-17T08:43:40.020",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:oracle:mysql_server:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "6C338948-2AAC-47B7-B3CD-C5F10B1AE7ED",
              "versionEndIncluding": "8.0.39",
              "versionStartIncluding": "8.0.0"
            },
            {
              "criteria": "cpe:2.3:a:oracle:mysql_server:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "9AED5FB1-1F21-4D10-904F-3124A719B08A",
              "versionEndIncluding": "8.4.2",
              "versionStartIncluding": "8.4.0"
            },
            {
              "criteria": "cpe:2.3:a:oracle:mysql_server:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "68961D2D-4D0A-4407-87B3-55CD49B84675",
              "versionEndIncluding": "9.0.1",
              "versionStartIncluding": "9.0.0"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "secalert_us@oracle.com"
}