What is CVE-2025-23020?

CVE-2025-23020 is a medium-severity vulnerability in Ptrd Kwik, classified under Inefficient Algorithmic Complexity. CVSS score: 5.3/10. Published 2025-02-20.

How severe is CVE-2025-23020?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Is CVE-2025-23020 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in Ptrd Kwik

CVE-2025-23020

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).

EPSS: 0.006 (43.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.

Affected products

Ptrd Kwik — versions 0

Weakness classification (CWE)

CWE-407 — Inefficient Algorithmic Complexity

Public proof-of-concept exploits

ncc-pbottine/QUIC-Hash-Dos-Advisory

References

Frequently asked questions

What is CVE-2025-23020?: CVE-2025-23020 is a medium-severity vulnerability in Ptrd Kwik, classified under Inefficient Algorithmic Complexity. CVSS score: 5.3/10. Published 2025-02-20.
How severe is CVE-2025-23020?: Medium severity. CVSS v3 base score is 5.3 out of 10.
Is CVE-2025-23020 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.