CVE-2021-32715— Lenient Parsing of Content-Length Header When Prefixed with Plus Sign
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I. Basic Information for CVE-2021-32715
Vulnerability Information
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Vulnerability Title
Lenient Parsing of Content-Length Header When Prefixed with Plus Sign
Source: NVD (National Vulnerability Database)
Vulnerability 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.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
HTTP请求的解释不一致性(HTTP请求私运)
Source: NVD (National Vulnerability Database)
Vulnerability Title
hyperium hyper 环境问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
hyperium hyper是开源的Rust 的 HTTP 库。旨在成为库和应用程序的构建块。 hyperium hyper存在环境问题漏洞，该漏洞源于hyper 的 HTTP/1 服务器错误地解析和接受带有“Content-Length”标头的请求。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2021-32715
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- https://github.com/hyperium/hyper/security/advisories/GHSA-f3pg-qwvg-p99cx_refsource_CONFIRM
- https://nvd.nist.gov/vuln/detail/CVE-2021-32715
IV. Related Vulnerabilities
Same weakness: CWE-444
- CVE-2026-40562
Gazelle versions through 0.49 for Perl allows HTTP Request S - CVE-2026-40561
Starlet versions through 0.31 for Perl allows HTTP Request S - CVE-2026-39805
CL.CL HTTP request smuggling via duplicate Content-Length in - CVE-2026-40560
Starman versions before 0.4018 for Perl allows HTTP Request - CVE-2026-41873
Pony Mail: Admin account takeover via request smuggling
V. Comments for CVE-2021-32715
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