CVE-2020-37056
CRITICAL
2026-01-30
[email protected]
9.8
CVSS 3.1
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CVSS Vector
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
Lifecycle Timeline
3
Analysis Generated
Mar 12, 2026 - 22:00 vuln.today
PoC Detected
Feb 03, 2026 - 16:44 vuln.today
Public exploit code
CVE Published
Jan 30, 2026 - 23:16 nvd
CRITICAL 9.8
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.
Analysis
IP spoofing vulnerability in Crystal Shard http-protection 0.2.0 allows attackers to bypass protection middleware by manipulating request headers. PoC available.
Technical Context
CWE-290 authentication bypass via IP spoofing. HTTP middleware trusts client-supplied headers for IP identification.
Affected Products
['Crystal Shard http-protection 0.2.0']
Remediation
Update http-protection. Configure trusted proxy settings.
Priority Score
69
Low
Medium
High
Critical
KEV: 0
EPSS: +0.0
CVSS: +49
POC: +20
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External POC / Exploit Code
Leaving vuln.today
Destination URL
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