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CVE-2021-37630

Estado: ModificadaMedia (6.5)—

Nextcloud Circles is an open source social network built for the nextcloud ecosystem. In affected versions the Nextcloud Circles application allowed any user to join any "Secret Circle" without approval by the Circle owner leaking private information. It is recommended that Nextcloud Circles is upgraded to 0.19.15, 0.20.11 or 0.21.4. There are no workarounds for this issue.

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 — Circles

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2021-37630",
  "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:P/I:N/A:N",
          "authentication": "SINGLE",
          "integrityImpact": "NONE",
          "accessComplexity": "LOW",
          "availabilityImpact": "NONE",
          "confidentialityImpact": "PARTIAL"
        },
        "acInsufInfo": false,
        "impactScore": 2.9,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 8,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "security-advisories@github.com",
        "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:H/I:N/A:N",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 2.8
      },
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
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          "attackVector": "NETWORK",
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          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 3.6,
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      }
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  "affected": [
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      "source": "security-advisories@github.com",
      "affectedData": [
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          "vendor": "nextcloud",
          "product": "security-advisories",
          "versions": [
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              "status": "affected",
              "version": "< 0.19.15"
            },
            {
              "status": "affected",
              "version": ">= 0.20.0, < 0.20.11"
            },
            {
              "status": "affected",
              "version": ">= 0.21.0, < 0.21.4"
            }
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  ],
  "published": "2021-09-07T20:15:07.847",
  "references": [
    {
      "url": "https://github.com/nextcloud/circles/pull/768",
      "tags": [
        "Patch",
        "Third Party Advisory"
      ],
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/nextcloud/security-advisories/security/advisories/GHSA-56j9-3rj4-wvgm",
      "tags": [
        "Third Party Advisory"
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      "source": "security-advisories@github.com"
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    {
      "url": "https://hackerone.com/reports/1257624",
      "tags": [
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        "Third Party Advisory"
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      "source": "security-advisories@github.com"
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    {
      "url": "https://github.com/nextcloud/circles/pull/768",
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
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    {
      "url": "https://github.com/nextcloud/security-advisories/security/advisories/GHSA-56j9-3rj4-wvgm",
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      "tags": [
        "Permissions Required",
        "Third Party Advisory"
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
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  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "security-advisories@github.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-639"
        }
      ]
    },
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-639"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Nextcloud Circles is an open source social network built for the nextcloud ecosystem. In affected versions the Nextcloud Circles application allowed any user to join any \"Secret Circle\" without approval by the Circle owner leaking private information. It is recommended that Nextcloud Circles is upgraded to 0.19.15, 0.20.11 or 0.21.4. There are no workarounds for this issue."
    },
    {
      "lang": "es",
      "value": "Nextcloud Circles es una red social de código abierto construida para el ecosistema nextcloud. En las versiones afectadas la aplicación Nextcloud Circles permitía a cualquier usuario unirse a cualquier \"Secret Circle\" sin la aprobación del propietario del Círculo, filtrando información privada. Es recomendado actualizar Nextcloud Circles a versiones 0.19.15, 0.20.11 o 0.21.4. No se presentan soluciones para este problema"
    }
  ],
  "lastModified": "2026-06-17T04:00:51.920",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
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              "matchCriteriaId": "CB51D431-2C3E-4B2F-B366-7C8747A11166",
              "versionEndExcluding": "0.19.5"
            },
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              "versionEndExcluding": "0.20.11",
              "versionStartIncluding": "0.20.0"
            },
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}