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CVE-2026-21531

Estado: AnalizadaCrítica (9.8)—

Deserialization of untrusted data in Azure SDK allows an unauthorized attacker to execute code over a network.

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.

Vector CVSS:N sin PR/UI indica ataque remoto sin privilegios (T1190). CWE-502 (deserialización insegura) en librería SDK expuesta permite ejecución de código arbitrario (T1059) sobre la red.

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)

Microsoft — Azure Conversation Authoring Client Library

CWE

Referencias

JSON original (NVD)

Mostrar
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          "options": [
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              "exploitation": "none"
            },
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            },
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              "technicalImpact": "total"
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          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 5.9,
        "exploitabilityScore": 3.9
      }
    ]
  },
  "affected": [
    {
      "source": "secure@microsoft.com",
      "affectedData": [
        {
          "vendor": "Microsoft",
          "product": "Azure AI Language Authoring",
          "versions": [
            {
              "status": "affected",
              "version": "1.0.0",
              "lessThan": "1.0.0b4",
              "versionType": "custom"
            }
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        }
      ]
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  "published": "2026-02-10T18:16:35.580",
  "references": [
    {
      "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21531",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "secure@microsoft.com"
    }
  ],
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    }
  ],
  "lastModified": "2026-06-17T10:18:47.720",
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