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CVE-2021-22138

Estado: ModificadaBaja (3.7)—

In Logstash versions after 6.4.0 and before 6.8.15 and 7.12.0 a TLS certificate validation flaw was found in the monitoring feature. When specifying a trusted server CA certificate Logstash would not properly verify the certificate returned by the monitoring server. This could result in a man in the middle style attack against the Logstash monitoring data.

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)

Elastic — Logstash

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2021-22138",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 4.3,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:M/Au:N/C:P/I:N/A:N",
          "authentication": "NONE",
          "integrityImpact": "NONE",
          "accessComplexity": "MEDIUM",
          "availabilityImpact": "NONE",
          "confidentialityImpact": "PARTIAL"
        },
        "acInsufInfo": false,
        "impactScore": 2.9,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 8.6,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 3.7,
          "attackVector": "NETWORK",
          "baseSeverity": "LOW",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "HIGH",
          "availabilityImpact": "NONE",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "LOW"
        },
        "impactScore": 1.4,
        "exploitabilityScore": 2.2
      }
    ]
  },
  "affected": [
    {
      "source": "security@elastic.co",
      "affectedData": [
        {
          "vendor": "Elastic",
          "product": "Elasticsearch",
          "versions": [
            {
              "status": "affected",
              "version": "after 6.4.0 and before 6.8.15 and 7.12.0"
            }
          ]
        }
      ]
    }
  ],
  "published": "2021-05-13T18:15:09.077",
  "references": [
    {
      "url": "https://discuss.elastic.co/t/elastic-stack-7-12-0-and-6-8-15-security-update/268125",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "security@elastic.co"
    },
    {
      "url": "https://security.netapp.com/advisory/ntap-20210629-0001/",
      "tags": [
        "Third Party Advisory"
      ],
      "source": "security@elastic.co"
    },
    {
      "url": "https://discuss.elastic.co/t/elastic-stack-7-12-0-and-6-8-15-security-update/268125",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://security.netapp.com/advisory/ntap-20210629-0001/",
      "tags": [
        "Third Party Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "security@elastic.co",
      "description": [
        {
          "lang": "en",
          "value": "CWE-295"
        }
      ]
    },
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-295"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "In Logstash versions after 6.4.0 and before 6.8.15 and 7.12.0 a TLS certificate validation flaw was found in the monitoring feature. When specifying a trusted server CA certificate Logstash would not properly verify the certificate returned by the monitoring server. This could result in a man in the middle style attack against the Logstash monitoring data."
    },
    {
      "lang": "es",
      "value": "En Logstash versiones posteriores a 6.4.0 y anteriores a 6.8.15 y 7.12.0, se encontró un fallo de comprobación del certificado TLS en la funcionalidad de monitoreo. Cuando se especifica un certificado CA en un servidor confiable, Logstash no verificaba apropiadamente el certificado devuelto por el servidor de monitoreo. Esto podría resultar en un ataque de tipo man in the middle contra los datos de monitoreo de Logstash"
    }
  ],
  "lastModified": "2026-06-17T03:36:40.987",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:elastic:logstash:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "AF51983B-CF75-4CFE-8E8F-C535086AA57B",
              "versionEndExcluding": "6.8.15",
              "versionStartIncluding": "6.4.0"
            },
            {
              "criteria": "cpe:2.3:a:elastic:logstash:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "1BD39C4B-52DA-4EE2-B2A5-4CFBC8924EE0",
              "versionEndExcluding": "7.12.0",
              "versionStartIncluding": "7.0.0"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "security@elastic.co"
}