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CVE-2019-20104

Estado: ModificadaAlta (7.5)—

The OpenID client application in Atlassian Crowd before version 3.6.2, and from version 3.7.0 before 3.7.1 allows remote attackers to perform a Denial of Service attack via an XML Entity Expansion vulnerability.

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)

Atlassian — Crowd

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2019-20104",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 5,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:P",
          "authentication": "NONE",
          "integrityImpact": "NONE",
          "accessComplexity": "LOW",
          "availabilityImpact": "PARTIAL",
          "confidentialityImpact": "NONE"
        },
        "acInsufInfo": false,
        "impactScore": 2.9,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 10,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "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": "security@atlassian.com",
      "affectedData": [
        {
          "vendor": "Atlassian",
          "product": "Crowd",
          "versions": [
            {
              "status": "affected",
              "version": "unspecified",
              "lessThan": "3.6.2",
              "versionType": "custom"
            },
            {
              "status": "affected",
              "version": "3.7.0",
              "lessThan": "unspecified",
              "versionType": "custom"
            },
            {
              "status": "affected",
              "version": "unspecified",
              "lessThan": "3.7.1",
              "versionType": "custom"
            }
          ]
        }
      ]
    }
  ],
  "published": "2020-02-06T03:15:10.123",
  "references": [
    {
      "url": "https://jira.atlassian.com/browse/CWD-5526",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "security@atlassian.com"
    },
    {
      "url": "https://zeroauth.ltd/blog/2020/02/07/cve-2019-20104-atlassian-crowd-openid-client-vulnerable-to-remote-dos-via-xml-entity-expansion/",
      "tags": [
        "Exploit",
        "Technical Description"
      ],
      "source": "security@atlassian.com"
    },
    {
      "url": "https://jira.atlassian.com/browse/CWD-5526",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://zeroauth.ltd/blog/2020/02/07/cve-2019-20104-atlassian-crowd-openid-client-vulnerable-to-remote-dos-via-xml-entity-expansion/",
      "tags": [
        "Exploit",
        "Technical Description"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-776"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "The OpenID client application in Atlassian Crowd before version 3.6.2, and from version 3.7.0 before 3.7.1 allows remote attackers to perform a Denial of Service attack via an XML Entity Expansion vulnerability."
    },
    {
      "lang": "es",
      "value": "La aplicación de cliente OpenID en Atlassian Crowd antes de la versión 3.6.2 y desde la versión 3.7.0 anteriores a 3.7.1, permite a atacantes remotos llevar a cabo un ataque de Denegación de Servicio por medio de una vulnerabilidad de tipo XML Entity Expansion."
    }
  ],
  "lastModified": "2026-06-17T02:29:59.020",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
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              "vulnerable": true,
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              "versionEndExcluding": "3.2.11"
            },
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              "vulnerable": true,
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              "versionEndExcluding": "3.3.8",
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            },
            {
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              "vulnerable": true,
              "matchCriteriaId": "8C438EFF-3115-4932-A8E4-2A3D333C0420",
              "versionEndExcluding": "3.4.7",
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            },
            {
              "criteria": "cpe:2.3:a:atlassian:crowd:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "32363B16-622B-40B2-81FD-891350688619",
              "versionEndExcluding": "3.5.2",
              "versionStartIncluding": "3.5.0"
            },
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              "vulnerable": true,
              "matchCriteriaId": "F5E26921-D031-47FE-98BA-E0BDF43A1CDD",
              "versionEndExcluding": "3.6.2",
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            },
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              "vulnerable": true,
              "matchCriteriaId": "ED1160D9-F1BB-4D34-9240-9ECB04C2D19A",
              "versionEndExcluding": "3.7.1",
              "versionStartIncluding": "3.6.3"
            },
            {
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              "vulnerable": true,
              "matchCriteriaId": "CB431461-C139-4E40-9B50-CEE0EDAE6679",
              "versionEndExcluding": "4.0.0",
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            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "security@atlassian.com"
}