Security advisory

{
  "id": "34611f80a4877235554d71322ad20b424c678ba9d0e82d8066eec0f86068e89d",
  "url": "https://osv.dev/vulnerability/CVE-2021-44521",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2021-44521",
    "summary": "When running Apache Cassandra with the following configuration: enable_user_defined_functions: true enable_scripted_user_defined_functions: true enable_user_defined_functions_threads: false it is possible for an attacker to execute arbitrary code on the host. The attacker would need to have enough permissions to create user defined functions in the cluster to be able to exploit this. Note that this configuration is documented as unsafe, and will continue to be considered unsafe after this CVE.",
    "evidence": "osv:CVE-2021-44521",
    "products": [],
    "severity": "critical",
    "structured": {
      "id": "CVE-2021-44521",
      "aliases": [
        "BIT-cassandra-2021-44521",
        "CVE-2021-44521",
        "GHSA-8ffc-79xg-29w8"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/apache/cassandra",
              "type": "GIT",
              "events": [
                {
                  "introduced": "96f407bce56b98cd824d18e32ee012dbb99a0286"
                },
                {
                  "fixed": "b18adcba1a808cf77576905dc2ceccd7783bdb18"
                },
                {
                  "introduced": "88dee7e9d515ad94ecf8f2309f1e6138ec79e1a2"
                },
                {
                  "fixed": "b44ff92eb2921e8d66fe2e994cb27289d3786faa"
                },
                {
                  "introduced": "902b4d31772eaa84f05ffdc1e4f4b7a66d5b17e6"
                },
                {
                  "fixed": "25012d2fec1984cc9c1a352f214eb912ca4f10f5"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:apache:cassandra:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "3.0.0"
                      },
                      {
                        "fixed": "3.0.26"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:apache:cassandra:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "3.11.0"
                      },
                      {
                        "fixed": "3.11.12"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:apache:cassandra:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "4.0.0"
                      },
                      {
                        "fixed": "4.0.2"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "cassandra-3.0.25",
            "cassandra-3.11.11",
            "cassandra-3.11.10",
            "cassandra-3.0.24",
            "cassandra-3.11.9",
            "cassandra-3.0.23",
            "cassandra-3.11.8",
            "cassandra-3.0.22",
            "cassandra-3.0.21",
            "cassandra-3.11.6",
            "cassandra-3.0.20",
            "cassandra-3.11.5",
            "cassandra-3.0.19",
            "cassandra-3.11.4",
            "cassandra-3.0.18",
            "cassandra-3.11.3",
            "cassandra-3.0.17",
            "cassandra-3.11.2",
            "cassandra-3.0.16",
            "cassandra-3.11.1",
            "cassandra-3.0.15",
            "cassandra-3.11.0",
            "cassandra-3.0.14",
            "cassandra-3.0.13",
            "cassandra-3.0.12",
            "cassandra-3.0.11",
            "cassandra-3.0.10",
            "cassandra-3.0.9",
            "cassandra-3.0.7",
            "cassandra-3.0.6",
            "cassandra-3.0.5",
            "cassandra-3.0.4",
            "cassandra-3.0.3",
            "cassandra-3.0.1",
            "cassandra-3.0.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-44521.json"
          }
        }
      ],
      "modified": "2026-10-24T10:30:19.659516840Z",
      "provider": "osv",
      "references": [
        "https://security.netapp.com/advisory/ntap-20220225-0001/",
        "https://lists.apache.org/thread/y4nb9s4co34j8hdfmrshyl09lokm7356",
        "https://jfrog.com/blog/cve-2021-44521-exploiting-apache-cassandra-user-defined-functions-for-remote-code-execution/"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2021-44521",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 430076,
  "published_at": "2022-02-11T13:15:07.907+00:00"
}