Is CVE-2021-32714 actively exploited?

No active exploitation of CVE-2021-32714 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2021-32714 be exploited remotely?

Yes. CVE-2021-32714 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2021-32714?

CVE-2021-32714 has a CVSS score of 9.1 (CRITICAL).

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CRITICAL

CVE-2021-32714

CWE-190Published: July 7, 2021· Updated: Jun 17, 2026

9.1

CVSS v3.1

Official Description

hyper is an HTTP library for Rust. In versions prior to 0.14.10, hyper's HTTP server and client code had a flaw that could trigger an integer overflow when decoding chunk sizes that are too big. This allows possible data loss, or if combined with an upstream HTTP proxy that allows chunk sizes larger than hyper does, can result in "request smuggling" or "desync attacks." The vulnerability is patched in version 0.14.10. Two possible workarounds exist. One may reject requests manually that contain a `Transfer-Encoding` header or ensure any upstream proxy rejects `Transfer-Encoding` chunk sizes greater than what fits in 64-bit unsigned integers.

NVD Source

Technical Analysis

CVE-2021-32714 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.1.