CVE-2020-37056

CriticalCVSS 9.8/10Last modified Jun 17, 2026

Description

Crystal Shard http-protection 0.2.0 contains an IP spoofing vulnerability that allows attackers to bypass protection middleware by manipulating request headers. Attackers can hardcode consistent IP values across X-Forwarded-For, X-Client-IP, and X-Real-IP headers to circumvent security checks and gain unauthorized access.

Metrics

CVSS 3.1 9.8/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weakness enumeration

CWE-290

Affected software

No affected versions have been published.

Timeline

Published: Jan 30, 2026
Last modified: Jun 17, 2026
NVD status: Deferred

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