CVE-2025-23020

Severity: medium (CVSS 5.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-02-20 · updated 2026-06-17
Weakness: CWE-407

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).

Affected products

ptrd Kwik: before 0.10.1 — fixed in 0.10.1

How to fix

Upgrade to a fixed version: ptrd Kwik 0.10.1. Check the vendor advisory for mitigations.

References

https://github.com/ncc-pbottine/QUIC-Hash-Dos-Advisory
https://github.com/ptrd/kwik/releases/tag/v0.10.1

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