{"id":"CVE-2018-17194","aliases":["EUVD-2018-0796","GHSA-43fp-vwwg-qgv6"],"status":"published","title":"Apache NiFi Improper Input Validation vulnerability","description":"When a client request to a cluster node was replicated to other nodes in the cluster for verification, the Content-Length was forwarded. On a DELETE request, the body was ignored, but if the initial request had a Content-Length value other than 0, the receiving nodes would wait for the body and eventually timeout. Mitigation: The fix to check DELETE requests and overwrite non-zero Content-Length header values was applied on the Apache NiFi 1.8.0 release. Users running a prior 1.x release should upgrade to the appropriate release.","severity":{"version":"3.0","score":7.5,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-08","score":0.0297,"percentile":0.87334,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-20"],"published":"2018-12-19T14:00:00Z","modified":"2026-10-24T10:30:54Z","fixes":[{"ecosystem":"Maven","package":"org.apache.nifi:nifi-framework-cluster","fixed_in":["1.8.0"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"Maven","package":"org.apache.nifi:nifi-framework-cluster","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"1.0.0"},{"last_affected":"1.7.1"},{"fixed":"1.8.0"}]}]},{"source":"osv","ecosystem":"Maven","package":"org.apache.nifi:nifi-framework-cluster","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"1.0.0"},{"fixed":"1.8.0"}]}],"versions":["1.0.0","1.0.1","1.1.0","1.1.1","1.1.2","1.2.0","1.3.0","1.4.0","1.5.0","1.6.0","1.7.0","1.7.1"]}],"products":[{"vendor":"apache","product":"nifi"},{"vendor":"apache software foundation","product":"apache nifi"}],"references":[{"url":"https://nifi.apache.org/security.html#CVE-2018-17194","tags":["x_refsource_CONFIRM","x_transferred","Vendor Advisory","advisory","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2018-17194","tags":["advisory"]},{"url":"https://github.com/apache/nifi/commit/1baead6f525046a613fc4fe494a0d193776ea70f","tags":["web"]},{"url":"https://github.com/apache/nifi/commit/748cf745628dab20b7e71f12b5dcfe6ed0bbf134","tags":["web"]},{"url":"https://issues.apache.org/jira/browse/NIFI-5628","tags":["web"]},{"url":"https://github.com/advisories/GHSA-43fp-vwwg-qgv6"},{"url":"https://github.com/apache/nifi","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2018-17194","description":"When a client request to a cluster node was replicated to other nodes in the cluster for verification, the Content-Length was forwarded. On a DELETE request, the body was ignored, but if the initial request had a Content-Length value other than 0, the receiving nodes would wait for the body and eventually timeout. Mitigation: The fix to check DELETE requests and overwrite non-zero Content-Length header values was applied on the Apache NiFi 1.8.0 release. Users running a prior 1.x release should upgrade to the appropriate release.","status":"published","published":"2018-12-19T14:00:00Z","modified":"2024-08-05T10:39:59.603Z","updated_at":"2026-11-02T14:35:07.354449Z"}],"euvd":[{"id":"EUVD-2018-0796","description":"When a client request to a cluster node was replicated to other nodes in the cluster for verification, the Content-Length was forwarded. On a DELETE request, the body was ignored, but if the initial request had a Content-Length value other than 0, the receiving nodes would wait for the body and eventually timeout. Mitigation: The fix to check DELETE requests and overwrite non-zero Content-Length header values was applied on the Apache NiFi 1.8.0 release. Users running a prior 1.x release should upgrade to the appropriate release.","status":"published","published":"2018-12-19T14:00:00Z","modified":"2024-08-05T10:39:59Z","updated_at":"2026-11-03T02:39:39.763591Z"}],"ghsa":[{"id":"GHSA-43fp-vwwg-qgv6","title":"Apache NiFi Improper Input Validation vulnerability","description":"When a client request to a cluster node was replicated to other nodes in the cluster for verification, the Content-Length was forwarded. On a DELETE request, the body was ignored, but if the initial request had a Content-Length value other than 0, the receiving nodes would wait for the body and eventually timeout. Mitigation: The fix to check DELETE requests and overwrite non-zero Content-Length header values was applied on the Apache NiFi 1.8.0 release. Users running a prior 1.x release should upgrade to the appropriate release.","status":"published","published":"2018-12-20T22:02:32Z","modified":"2024-03-04T21:40:55Z","cvss":[{"version":"3.0","score":7.5,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"cwes":["CWE-20"],"updated_at":"2026-11-02T14:37:39.730152Z"}],"nvd":[{"id":"CVE-2018-17194","description":"When a client request to a cluster node was replicated to other nodes in the cluster for verification, the Content-Length was forwarded. On a DELETE request, the body was ignored, but if the initial request had a Content-Length value other than 0, the receiving nodes would wait for the body and eventually timeout. Mitigation: The fix to check DELETE requests and overwrite non-zero Content-Length header values was applied on the Apache NiFi 1.8.0 release. Users running a prior 1.x release should upgrade to the appropriate release.","status":"published","published":"2018-12-19T14:29:00.44Z","modified":"2026-06-17T01:45:31.01Z","cvss":[{"version":"3.0","score":7.5,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"primary"},{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:N/I:N/A:P","level":"medium","assessor":"primary"}],"cwes":["CWE-20"],"updated_at":"2026-11-02T14:04:50.99633Z"}],"osv":[{"id":"CVE-2018-17194","description":"When a client request to a cluster node was replicated to other nodes in the cluster for verification, the Content-Length was forwarded. On a DELETE request, the body was ignored, but if the initial request had a Content-Length value other than 0, the receiving nodes would wait for the body and eventually timeout. Mitigation: The fix to check DELETE requests and overwrite non-zero Content-Length header values was applied on the Apache NiFi 1.8.0 release. Users running a prior 1.x release should upgrade to the appropriate release.","status":"published","published":"2018-12-19T14:29:00.44Z","modified":"2026-10-24T10:30:54.824706537Z","cvss":[{"version":"3.0","score":7.5,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:44:08.533609Z"},{"id":"GHSA-43fp-vwwg-qgv6","title":"Apache NiFi Improper Input Validation vulnerability","description":"When a client request to a cluster node was replicated to other nodes in the cluster for verification, the Content-Length was forwarded. On a DELETE request, the body was ignored, but if the initial request had a Content-Length value other than 0, the receiving nodes would wait for the body and eventually timeout. Mitigation: The fix to check DELETE requests and overwrite non-zero Content-Length header values was applied on the Apache NiFi 1.8.0 release. Users running a prior 1.x release should upgrade to the appropriate release.","status":"published","published":"2018-12-20T22:02:32Z","modified":"2024-03-04T21:49:21.756507Z","cvss":[{"version":"3.0","score":7.5,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"cwes":["CWE-20"],"updated_at":"2026-11-02T15:46:36.434231Z"}]}}