{
  "affected": [
    {
      "database_specific": {
        "unresolved_ranges": [
          {
            "events": [
              {
                "introduced": "0"
              },
              {
                "last_affected": "34"
              }
            ]
          }
        ]
      },
      "ranges": [
        {
          "database_specific": {
            "versions": [
              {
                "introduced": "0"
              },
              {
                "fixed": "19.0.11"
              },
              {
                "introduced": "20.0.0"
              },
              {
                "fixed": "20.0.10"
              },
              {
                "introduced": "21.0.0"
              },
              {
                "fixed": "21.0.2"
              },
              {
                "introduced": "0"
              },
              {
                "last_affected": "33"
              }
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "ea6649a511ec5963b984342a50103c3637d621a3"
            },
            {
              "introduced": "615b994816710a595243d704c9be445f736b4b41"
            },
            {
              "fixed": "6e537422555592ba6542780533963a67fff68cf1"
            },
            {
              "introduced": "8985b7930653139859002eb3eca2852999ed8f0d"
            },
            {
              "fixed": "59752ce269dfb122ef9e3ae56c33464551aa74e1"
            },
            {
              "introduced": "0"
            },
            {
              "last_affected": "72c37934b777f496bf6b9bc12e5d702423a22d8a"
            }
          ],
          "repo": "https://github.com/nextcloud/server",
          "type": "GIT"
        }
      ]
    }
  ],
  "details": "Nextcloud server before 19.0.11, 20.0.10, 21.0.2 is vulnerable to brute force attacks due to lack of inclusion of IPv6 subnets in rate-limiting considerations. This could potentially result in an attacker bypassing rate-limit controls such as the Nextcloud brute-force protection.",
  "id": "CVE-2021-22915",
  "modified": "2026-03-13T21:56:52.868286243Z",
  "published": "2021-06-11T16:15:11.913Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/AGXGR6HYGQ6MZXISMJEHCOXRGRFRUFMA/"
    },
    {
      "type": "WEB",
      "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/L6BO6P6MP2MOWA6PZRXX32PLWPXN5O4S/"
    },
    {
      "type": "ADVISORY",
      "url": "https://nextcloud.com/security/advisory/?id=NC-SA-2021-009"
    },
    {
      "type": "REPORT",
      "url": "https://hackerone.com/reports/1154003"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}