Is CVE-2020-35863 actively exploited?

No active exploitation of CVE-2020-35863 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2020-35863 be exploited remotely?

Yes. CVE-2020-35863 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2020-35863?

CVE-2020-35863 has a CVSS score of 9.8 (CRITICAL).

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CRITICAL

CVE-2020-35863

CWE-444Published: December 31, 2020· Updated: Jun 17, 2026

9.8

CVSS v3.1

Official Description

An issue was discovered in the hyper crate before 0.12.34 for Rust. HTTP request smuggling can occur. Remote code execution can occur in certain situations with an HTTP server on the loopback interface.

NVD Source

Technical Analysis

CVE-2020-35863 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 complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.