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CVE-2021-22906

Estado: ModificadaMedia (6.5)—

Nextcloud End-to-End Encryption before 1.5.3, 1.6.3 and 1.7.1 suffers from a denial of service vulnerability due to permitting any authenticated users to lock files of other users.

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)

Nextcloud — End-to-end Encryption

CWE

Referencias

JSON original (NVD)

Mostrar
{
  "id": "CVE-2021-22906",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 4,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:L/Au:S/C:N/I:N/A:P",
          "authentication": "SINGLE",
          "integrityImpact": "NONE",
          "accessComplexity": "LOW",
          "availabilityImpact": "PARTIAL",
          "confidentialityImpact": "NONE"
        },
        "acInsufInfo": false,
        "impactScore": 2.9,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 8,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV31": [
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        "type": "Primary",
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        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 6.5,
          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 2.8
      }
    ]
  },
  "affected": [
    {
      "source": "support@hackerone.com",
      "affectedData": [
        {
          "vendor": "n/a",
          "product": "Nextcloud End-to-End Encryption",
          "versions": [
            {
              "status": "affected",
              "version": "Fixed in 1.5.3, 1.6.3, 1.7.1"
            }
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  ],
  "published": "2021-06-11T16:15:11.677",
  "references": [
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      "url": "https://github.com/nextcloud/security-advisories/security/advisories/GHSA-3829-45wm-ww36",
      "tags": [
        "Third Party Advisory"
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      "source": "support@hackerone.com"
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    },
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      "tags": [
        "Exploit",
        "Issue Tracking",
        "Third Party Advisory"
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
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  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "support@hackerone.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-400"
        }
      ]
    },
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-639"
        }
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  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Nextcloud End-to-End Encryption before 1.5.3, 1.6.3 and 1.7.1 suffers from a denial of service vulnerability due to permitting any authenticated users to lock files of other users."
    },
    {
      "lang": "es",
      "value": "Nextcloud End-to-End Encryption versiones anteriores a 1.5.3, 1.6.3 y 1.7.1, sufre una vulnerabilidad de denegación de servicio debido a que permite a cualquier usuario autenticado bloquear archivos de otros usuarios"
    }
  ],
  "lastModified": "2026-06-17T03:37:59.927",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
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              "vulnerable": true,
              "matchCriteriaId": "BF925594-89E2-44DB-BB9A-7A35E577C62C",
              "versionEndExcluding": "1.5.3"
            },
            {
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              "vulnerable": true,
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            },
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              "matchCriteriaId": "14843B83-0AA6-42C8-953C-DB201C0A7268",
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          ],
          "operator": "OR"
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  "sourceIdentifier": "support@hackerone.com"
}