Is CVE-2021-32715 actively exploited?

CVE-2021-32715 has no public evidence of in-the-wild exploitation as of 2024-11-21.

What is the CVSS score for CVE-2021-32715?

CVE-2021-32715 has a CVSS score of 3.1 (LOW severity). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N.

How do I patch CVE-2021-32715?

Patch guidance is available from hyper security advisories. CVEDatabase generates AI-assisted remediation guidance on demand for CVE-2021-32715.

CVE-2021-32715 - remediation guidance & executive summary

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.

CVSS Metrics

Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N
Attack Vector: network
Complexity: high
Privileges: none
User Action: required
Scope: unchanged
Confidentiality: low
Integrity: none
Availability: none
Weaknesses: CWE-444 CWE-444

Metadata

Primary Vendor: HYPER
Published: 7/7/2021
Last Modified: 11/21/2024
Source: NIST NVD
Note: Verify all details with official vendor sources before applying patches.

Affected Products

hyper : hyper

Remediation Guidance

Executive Summary

Cite this page

CVE-2021-32715. CVEDatabase.com. Retrieved 1 May 2026. https://cvedatabase.com/cve/CVE-2021-32715

View on NIST NVD

CVE-2021-32715 vulnerability