Vulnerability · Published Jan 30, 2026 · Assigned by VulnCheck
CVE-2020-37056Crystal Shard http-protection 0.2.0 - IP Spoofing Bypass
Critical 9.8
In plain English
A critical-severity authentication bypass by spoofing in http-protection from Crystal Shard. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 49% of all known vulnerabilities).
Severity (CVSS 3.1)9.8Critical
Exploit odds (30 days)0.6%top 51.3% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
Official 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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Crystal Shard | http-protection | <= 0.2.0 |
Weakness: CWE-290 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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