CVE-2021-32715

CVE-2021-32715 · Lenient Parsing of Content-Length Header When Prefixed with Plus Sign

This page contains facts from public vulnerability sources. Check the original advisory before updating.

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.

CVSS 3.1 · Low · EPSS 1.1% · Fix available

Published

2021-07-07T20:05:11.000Z

Updated

2024-08-03T23:25:31.081Z

Stack: system

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