Security advisory

{
  "id": "e374795c793b6049e9939f189e34ced1ed0bdcda03be3a681cdbfcbe8dd94954",
  "url": "https://osv.dev/vulnerability/CVE-2021-38621",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2021-38621",
    "summary": "The remove API in v1/controller/cloudStorage/alibabaCloud/remove/index.ts in netless Agora Flat Server before 2021-07-30 mishandles file ownership.",
    "evidence": "osv:CVE-2021-38621",
    "products": [],
    "severity": "critical",
    "structured": {
      "id": "CVE-2021-38621",
      "aliases": [
        "CVE-2021-38621"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/netless-io/flat-server",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "425aa970f6366874c61aa1466527fced5501e476"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "fixed": "425aa970f6366874c61aa1466527fced5501e476"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-38621.json"
          }
        }
      ],
      "modified": "2026-10-20T10:54:52.897583858Z",
      "provider": "osv",
      "references": [
        "https://github.com/netless-io/flat-server/commit/425aa970f6366874c61aa1466527fced5501e476"
      ],
      "provider_metadata": {
        "unresolved_ranges": [
          {
            "cpes": [
              "cpe:2.3:a:netless:flat_server:*:*:*:*:*:node.js:*:*"
            ],
            "vendor_product": "netless:flat_server",
            "extracted_events": [
              {
                "range": [
                  {
                    "fixed": "2021-07-30"
                  }
                ],
                "source": "CPE_RANGE"
              }
            ]
          },
          {
            "extracted_events": [
              {
                "range": [
                  {
                    "fixed": "2021-07-30"
                  }
                ],
                "source": "DESCRIPTION"
              }
            ]
          }
        ]
      }
    },
    "related_cves": [
      {
        "value": "CVE-2021-38621",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 386352,
  "published_at": "2021-08-13T15:15:07.16+00:00"
}