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CVE-2021-32715

3.1 · LOW

hyper is an HTTP library for rust.

Published Jul 7, 2021CWE-444EPSS 1.13%

Overview

CVE-2021-32715 is a low-severity vulnerability. It was published on July 7, 2021 and has a CVSS 3.1 base score of 3.1 (LOW).

This vulnerability has a CVSS 3.1 base score of 3.1, rated LOW. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/hyperium/hyper/security/advisories/GHSA-f3pg-qwvg-p99cGitHubgithub.com/rust-lang/rust/pull/28826/commits/123a83326fb95366e94a3be1a74775df4db97739GitHubgithub.com/hyperium/hyper/security/advisories/GHSA-f3pg-qwvg-p99cGitHubgithub.com/rust-lang/rust/pull/28826/commits/123a83326fb95366e94a3be1a74775df4db97739

How CyberStrike helps

Frequently asked questions

What is CVE-2021-32715?

CVE-2021-32715 is a low-severity vulnerability. It was published on July 7, 2021 and has a CVSS 3.1 base score of 3.1 (LOW).

How severe is CVE-2021-32715?

This vulnerability has a CVSS 3.1 base score of 3.1, rated LOW. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2021-32715?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2021-32715?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-32715 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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