Vulnerability in Crystal Shard Http-Protection
CVE-2020-37056
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.
EPSS: 0.005 (42.1th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
Affected products
- Crystal Shard Http-protection — versions <= 0.2.0
Weakness classification (CWE)
References
- ExploitDB-48533 (exploit)
- HTTP Protection Crystal Shard Repository (product)
- VulnCheck Advisory: Crystal Shard http-protection 0.2.0 - IP Spoofing Bypass (third-party-advisory)
Frequently asked questions
- What is CVE-2020-37056?
- CVE-2020-37056 is a critical-severity vulnerability in Crystal Shard Http-Protection, classified under Authentication Bypass by Spoofing. CVSS score: 9.8/10. Published 2026-01-30.
- How severe is CVE-2020-37056?
- Critical severity. CVSS v3 base score is 9.8 out of 10.