CVE-2020-37056:

IP spoofing vulnerability in Crystal Shard http-protection 0.2.0 allows attackers to bypass security checks.

Score
A numerical rating that indicates how dangerous this vulnerability is.

9.8Critical

Published Date:Jan 30, 2026
CISA KEV Date:*No Data*
Industries Affected:20

Threat Predictions

EPSS Score:0.0
EPSS Percentile:12%

Exploitability

Score:3.9
Attack Vector:NETWORK
Attack Complexity:LOW
Privileges Required:NONE
User Interaction:NONE
Scope:UNCHANGED

Impact

Score:5.9
Confidentiality Impact:HIGH
Integrity Impact:HIGH
Availability Impact:HIGH

Description Preview

IP spoofing vulnerability in Crystal Shard http-protection 0.2.0 allows attackers to bypass security checks.

Overview

The vulnerability in Crystal Shard http-protection 0.2.0 stems from insufficient validation of client IP addresses. The protection middleware relies on these headers to determine the origin of requests, but fails to properly validate or cross-check the information. This oversight allows attackers to spoof their IP address by setting consistent values across multiple headers, effectively bypassing the intended security measures. The vulnerability is particularly concerning as it requires no special privileges or user interaction to exploit, and can be executed remotely over a network. With a CVSS v3.1 base score of 9.8 (Critical), this vulnerability poses a significant risk to systems relying on http-protection for security.

Remediation

To address this vulnerability, system administrators and developers should take the following steps:
1. Update to the latest version of Crystal Shard http-protection if a patched version is available.
2. Implement additional IP validation mechanisms that do not solely rely on easily manipulated headers.
3. Consider using a web application firewall (WAF) or other security solutions that can detect and prevent IP spoofing attempts.
4. Regularly audit and test the effectiveness of IP-based security measures.
5. Implement a defense-in-depth strategy that doesn't rely exclusively on IP-based protection.