What is CVE-2025-24947?

CVE-2025-24947 is a medium-severity vulnerability in Litespeedtech Lsquic, classified under Inefficient Algorithmic Complexity. CVSS score: 5.3/10. Published 2025-02-20.

How severe is CVE-2025-24947?

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

Is CVE-2025-24947 known to be exploited?

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

Vulnerability in Litespeedtech Lsquic

CVE-2025-24947

A hash collision vulnerability (in the hash table used to manage connections) in LSQUIC (aka LiteSpeed QUIC) before 4.2.0 allows remote attackers to cause a considerable CPU load on the server (a Hash DoS attack) by initiating connections…

EPSS: 0.006 (45.3th 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

Litespeedtech Lsquic — 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-2025-24947?: CVE-2025-24947 is a medium-severity vulnerability in Litespeedtech Lsquic, classified under Inefficient Algorithmic Complexity. CVSS score: 5.3/10. Published 2025-02-20.
How severe is CVE-2025-24947?: Medium severity. CVSS v3 base score is 5.3 out of 10.
Is CVE-2025-24947 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.