CVE-2020-37056

CRITICAL 9.8

Crystal Shard http-protection 0.2.0 - IP Spoofing Bypass

CVSS Score

9.8

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-290
Vendor	crystal shard
Product	http-protection
Published	Jan 30, 2026
Last Updated	Jul 28, 2026

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CVSS v3 Breakdown

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Affected Versions

Crystal Shard / http-protection

<= 0.2.0

References

NVD ↗ CVE.org ↗ EPSS Data ↗

exploit-db.com: https://www.exploit-db.com/exploits/48533 github.com: https://github.com/rogeriozambon/http-protection vulncheck.com: https://www.vulncheck.com/advisories/crystal-shard-http-protection-ip-spoofing-bypass

Credits

Halis Duraki (@0xduraki)