VulnerabilityDeferred

CVE-2025-23020

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).

MEDIUM 5.3EPSS 0.57%

Does this matter?

Lower severity and a low EPSS score (0.57%). Track it; it rarely justifies an emergency change on its own.

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).

CVSS 3.1: 5.3 MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
EPSS: 0.57% probability · 45th percentile
CISA KEV: Not listed
Weakness: CWE-407
Source: cve@mitre.org

References

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

Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.