{"id":"RUSTSEC-2021-0020","revision":"570b42cde40b4e77848da17b13c9e4da","records":[{"revision":"570b42cde40b4e77848da17b13c9e4da","observedAt":"2026-10-24T13:19:54.901+00:00","statement":{"source":"osv","id":"RUSTSEC-2021-0020","aliases":["CVE-2021-21299","GHSA-6hfq-h8hq-87mf"],"title":"Multiple Transfer-Encoding headers misinterprets request payload","description":"hyper's HTTP server code had a flaw that incorrectly understands some requests\nwith multiple transfer-encoding headers to have a chunked payload, when it\nshould have been rejected as illegal. This combined with an upstream HTTP proxy\nthat understands the request payload boundary differently can result in\n\"request smuggling\" or \"desync attacks\".","state":0,"publishedAt":"2021-02-05T12:00:00+00:00","modifiedAt":"2026-10-12T18:00:04.4107318+00:00","affected":[{"ecosystem":"crates.io","name":"hyper","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0.12.0"},{"kind":"fixed","version":"0.12.36"},{"kind":"introduced","version":"0.13.0-0"},{"kind":"fixed","version":"0.13.10"},{"kind":"introduced","version":"0.14.0-0"},{"kind":"fixed","version":"0.14.3"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V3","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","score":null,"severity":null}],"references":["https://crates.io/crates/hyper","https://rustsec.org/advisories/RUSTSEC-2021-0020.html","https://github.com/hyperium/hyper/commit/8f93123efef5c1361086688fe4f34c83c89cec02"],"sourceUrl":"https://osv.dev/vulnerability/RUSTSEC-2021-0020","license":"OSV · upstream source license applies","key":"osv:RUSTSEC-2021-0020","identifiers":["RUSTSEC-2021-0020","CVE-2021-21299","GHSA-6hfq-h8hq-87mf"]},"retained":false,"historicalAffected":[]}],"coverage":[]}