CVE-2020-37056 Crystal Shard http-protection 0.2.0 - IP Spoofing Bypass
Attackers can bypass IP-based protection middleware by spoofing request headers, gaining unauthorized access to protected resources.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2020-37056?
CVE-2020-37056 is a medium-severity vulnerability in Crystal Shard http-protection, published on 30 Jan 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
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.
Weakness: CWE-290
Which versions are affected by CVE-2020-37056?
How do I fix CVE-2020-37056?
No fix has been published for CVE-2020-37056 yet. Limit exposure of the affected software until one is available.
Is CVE-2020-37056 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2020-37056 exists.
Sources
Also known as GHSA-682r-rv3j-v5mh.