Security advisory

{
  "id": "1ac291dc90e6c1c4d2c1cba5c17c1502a0ef0bafb2ab6e1bb1b5f30e4f51c029",
  "url": "https://osv.dev/vulnerability/CVE-2021-3199",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2021-3199",
    "summary": "Directory traversal with remote code execution can occur in /upload in ONLYOFFICE Document Server before 5.6.3, when JWT is used, via a /.. sequence in an image upload parameter.",
    "evidence": "osv:CVE-2021-3199",
    "products": [],
    "severity": "critical",
    "structured": {
      "id": "CVE-2021-3199",
      "aliases": [
        "CVE-2021-3199"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/onlyoffice/documentserver",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "0187bea803abdd2b2b6ad8168272d77e27739add"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:onlyoffice:document_server:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "5.6.3"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "ONLYOFFICE-DocumentServer-5.6.2",
            "ONLYOFFICE-DocumentServer-5.6.1",
            "ONLYOFFICE-DocumentServer-5.6.0",
            "ONLYOFFICE-DocumentServer-5.5.3",
            "ONLYOFFICE-DocumentServer-5.5.1",
            "ONLYOFFICE-DocumentServer-5.5.0",
            "ONLYOFFICE-DocumentServer-5.4.2",
            "ONLYOFFICE-DocumentServer-5.4.1",
            "ONLYOFFICE-DocumentServer-5.4.0-2",
            "ONLYOFFICE-DocumentServer-5.3.4",
            "ONLYOFFICE-DocumentServer-5.3.2",
            "ONLYOFFICE-DocumentServer-5.3.1",
            "ONLYOFFICE-DocumentServer-5.3.0",
            "ONLYOFFICE-DocumentServer-5.2.8",
            "ONLYOFFICE-DocumentServer-5.2.7",
            "ONLYOFFICE-DocumentServer-5.2.6",
            "ONLYOFFICE-DocumentServer-5.2.4",
            "ONLYOFFICE-DocumentServer-5.2.3",
            "ONLYOFFICE-DocumentServer-5.2.2",
            "ONLYOFFICE-DocumentServer-5.2.0",
            "ONLYOFFICE-DocumentServer-5.1.5",
            "ONLYOFFICE-DocumentServer-5.1.4",
            "ONLYOFFICE-DocumentServer-5.1.3",
            "ONLYOFFICE-DocumentServer-5.1.2",
            "ONLYOFFICE-DocumentServer-5.1.1",
            "ONLYOFFICE-DocumentServer-5.1.0",
            "ONLYOFFICE-DocumentServer-5.0.7",
            "ONLYOFFICE-DocumentServer-5.0.6",
            "ONLYOFFICE-DocumentServer-5.0.5",
            "ONLYOFFICE-DocumentServer-5.0.4",
            "ONLYOFFICE-DocumentServer-5.0.3",
            "ONLYOFFICE-DocumentServer-4.4.3",
            "ONLYOFFICE-DocumentServer-4.4.2",
            "ONLYOFFICE-DocumentServer-4.4.1",
            "ONLYOFFICE-DocumentServer-4.3.6",
            "ONLYOFFICE-DocumentServer-4.3.5",
            "ONLYOFFICE-DocumentServer-4.3.4",
            "ONLYOFFICE-DocumentServer-4.3.3",
            "ONLYOFFICE-DocumentServer-4.3.2",
            "ONLYOFFICE-DocumentServer-4.3.1",
            "ONLYOFFICE-DocumentServer-4.3.0",
            "ONLYOFFICE-DocumentServer-4.2.11",
            "ONLYOFFICE-DocumentServer-4.2.10",
            "ONLYOFFICE-DocumentServer-4.2.9",
            "ONLYOFFICE-DocumentServer-4.0.0-9",
            "ONLYOFFICE-DocumentServer-4.2.8",
            "ONLYOFFICE-DocumentServer-4.2.7",
            "ONLYOFFICE-DocumentServer-4.2.5",
            "ONLYOFFICE-DocumentServer-4.2.4",
            "ONLYOFFICE-DocumentServer-4.2.3",
            "ONLYOFFICE-DocumentServer-4.2.1",
            "ONLYOFFICE-DocumentServer-4.2.0",
            "ONLYOFFICE-DocumentServer-4.1.8-1",
            "ONLYOFFICE-DocumentServer-4.1.6-3",
            "ONLYOFFICE-DocumentServer-4.1.5-1",
            "ONLYOFFICE-DocumentServer-4.1.4-3",
            "ONLYOFFICE-DocumentServer-4.1.2-37",
            "ONLYOFFICE-DocumentServer-4.0.3-3",
            "ONLYOFFICE-DocumentServer-4.0.2-4",
            "ONLYOFFICE-DocumentServer-4.0.1-34",
            "ONLYOFFICE-DocumentServer-3.0.0",
            "ONLYOFFICE-Online-Editors-2.5.7",
            "ONLYOFFICE-Online-Editors-2.5"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-3199.json"
          }
        }
      ],
      "modified": "2026-10-20T10:54:40.875358496Z",
      "provider": "osv",
      "references": [
        "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-3199",
        "https://github.com/ONLYOFFICE/DocumentServer/blob/903fe5ab7a275bd69c3c3346af2d21cf87ebeabf/CHANGELOG.md#563",
        "https://github.com/moehw/poc_exploits/tree/master/CVE-2021-3199/poc_uploadImageFile.py",
        "https://github.com/nola-milkin/poc_exploits/blob/master/CVE-2021-3199/poc_uploadImageFile.py"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2021-3199",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 385877,
  "published_at": "2021-01-26T18:16:28.507+00:00"
}