CVE-2025-23020 Kwik hash collision vulnerability
Remote attackers can cause excessive CPU load on servers using the Kwik library by exploiting a hash collision vulnerability in connection management.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2025-23020?
CVE-2025-23020 is a medium-severity denial of service vulnerability in ptrd Kwik, published on 20 Feb 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
An issue was discovered in Kwik before 0.10.1. A hash collision vulnerability (in the hash table used to manage connections) allows remote attackers to cause a considerable CPU load on the server (a Hash DoS attack) by initiating connections with colliding Source Connection IDs (SCIDs).
Weakness: CWE-407
Which versions are affected by CVE-2025-23020?
2 open source packages ship an affected version, including tech.kwik:kwik.
| Package | Affected | Fixed in |
|---|---|---|
tech.kwik:kwik Maven | All versions | 0.10.1 |
tech.kwik:kwik Maven | All versions | 0.10.1 |
How do I fix CVE-2025-23020?
Upgrade tech.kwik:kwik to 0.10.1 or later.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2025-23020 being exploited?
There is no known exploitation of CVE-2025-23020 in the wild and no public exploit code.
Sources
Also known as GHSA-9f57-9rhg-4hvm.