CVE-2020-37056: Crystal Shard HTTP-Protection

Critical severity, CVSS 9.8. EPSS: 0.6% chance of exploitation in the next 30 days.

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

• Crystal Shard HTTP-Protection: up to and including 0.2.0

Published 2026-01-30. Last modified 2026-06-17.