{"id":"CVE-2021-32715","revision":"3b2355e3c09d4faa86a68cfd14cf736e","records":[{"revision":"3b2355e3c09d4faa86a68cfd14cf736e","observedAt":"2026-10-24T18:17:28.628+00:00","statement":{"source":"nvd","id":"CVE-2021-32715","aliases":[],"title":"hyper is an HTTP library for rust. hyper's HTTP/1 server code had a flaw that incorrectly parses and accepts requests with a `Content-Length` header with a prefixed plus sign, when it should have been rejected as illegal. This combined with…","description":"hyper is an HTTP library for rust. hyper's HTTP/1 server code had a flaw that incorrectly parses and accepts requests with a `Content-Length` header with a prefixed plus sign, when it should have been rejected as illegal. This combined with an upstream HTTP proxy that doesn't parse such `Content-Length` headers, but forwards them, can result in \"request smuggling\" or \"desync attacks\". The flaw exists in all prior versions of hyper prior to 0.14.10, if built with `rustc` v1.5.0 or newer. The vulnerability is patched in hyper version 0.14.10. Two workarounds exist: One may reject requests manually that contain a plus sign prefix in the `Content-Length` header or ensure any upstream proxy handles `Content-Length` headers with a plus sign prefix.","state":0,"publishedAt":"2021-07-07T20:15:08.75+00:00","modifiedAt":"2026-06-17T03:53:29.05+00:00","affected":[],"metrics":[{"system":"CVSS 3.1 · security-advisories@github.com · Secondary","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N","score":3.1,"severity":"LOW"},{"system":"CVSS 3.1 · nvd@nist.gov · Primary","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","score":5.3,"severity":"MEDIUM"},{"system":"CVSS 2.0 · nvd@nist.gov · Primary","vector":"AV:N/AC:M/Au:N/C:N/I:P/A:N","score":4.3,"severity":"MEDIUM"}],"references":["https://github.com/hyperium/hyper/security/advisories/GHSA-f3pg-qwvg-p99c","https://github.com/rust-lang/rust/pull/28826/commits/123a83326fb95366e94a3be1a74775df4db97739"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2021-32715","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Modified","weaknesses":["CWE-444"],"productCriteria":["cpe:2.3:a:hyper:hyper:*:*:*:*:*:rust:*:*"],"sourceDates":{"published":"2021-07-07T20:15:08.750","lastModified":"2026-06-17T03:53:29.050"},"relatedAdvisories":[],"note":"NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2021-32715","identifiers":["CVE-2021-32715"]},"retained":false,"historicalAffected":[]}],"coverage":[]}