CVE-2020-37056 | Crystal Shard http-protection 0.2.0 contains an IP spoofing … | CVSS 9.8 CRITICAL

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.

Metadata

CVE ID: CVE-2020-37056
State: PUBLISHED
Assigner: VulnCheck
Reserved: 2026-01-28 18:18 UTC
Published: 2026-01-30 22:07 UTC
Last updated: 2026-07-28 01:47 UTC
Primary CWE: CWE-290
Authentication Bypass by Spoofing
Vendor / Product: Crystal Shard / http-protection
Sources: cve.org · NVD

Severity & Metrics

9.8 CRITICAL CVSS 3.1

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

SSVC — CISA Coordinator

Exploitation: PoC
Automatable: yes
Tech. Impact: total

Affected products (1)

Vendor	Product	Platform	Versions
Crystal Shard	http-protection	—	<= 0.2.0

Weakness (CWE)

CWE	Source	Description
CWE-290	cna	Authentication Bypass by Spoofing

CVSS scores (2)

Score	Severity	Version	Source	Vector
9.8	CRITICAL	3.1	cna	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
6.9	MEDIUM	4.0	cna	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N

References (3)

ExploitDB-48533 https://www.exploit-db.com/exploits/48533
HTTP Protection Crystal Shard Repository https://github.com/rogeriozambon/http-protection
VulnCheck Advisory: Crystal Shard http-protection 0.2.0 - IP Spoofing Bypass https://www.vulncheck.com/advisories/crystal-shard-http-protection-ip-spoofing-bypass