Security advisory

{
  "id": "4de903cdff5acd36a4e6d3c6aeba0f4d8852d8635feb44d11e8ce3fadf586645",
  "url": "https://osv.dev/vulnerability/CVE-2020-13940",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2020-13940",
    "summary": "In Apache NiFi 1.0.0 to 1.11.4, the notification service manager and various policy authorizer and user group provider objects allowed trusted administrators to inadvertently configure a potentially malicious XML file. The XML file has the ability to make external calls to services (via XXE).",
    "evidence": "osv:CVE-2020-13940",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2020-13940",
      "aliases": [
        "BIT-nifi-2020-13940",
        "CVE-2020-13940",
        "GHSA-q4xf-3pmq-3hw8"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/apache/nifi",
              "type": "GIT",
              "events": [
                {
                  "introduced": "74d5224783dfdc513f6b3ad5ed96671d3c581707"
                },
                {
                  "last_affected": "4d940bb151eb8d250b0319318b96d23c4a9819ae"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:apache:nifi:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "1.0.0"
                      },
                      {
                        "last_affected": "1.11.4"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-13940.json"
          }
        }
      ],
      "modified": "2026-10-24T10:30:44.534789540Z",
      "provider": "osv",
      "references": [
        "https://nifi.apache.org/security#CVE-2020-13940"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2020-13940",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 435914,
  "published_at": "2020-10-01T20:15:13.097+00:00"
}