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CVE-2025-24947

MEDIUM
5.3
CVSS Score
Published: February 20, 2025 at 12:00 AM UTC
Updated: June 17, 2026 at 08:59 AM UTC
1 product affected across 1 vendorLsquic

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Severity
MEDIUM5.3
Exploit prediction
EPSS 0.7%
SSVC
No known exploit

Description

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 with colliding Source Connection IDs (SCIDs). This is caused by XXH32 usage.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Lsquic· Litespeedtech
95%
v < 4.2.0
Affected range stops below 4.2.0, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (3)

Source: [email protected]
https://github.com/litespeedtech/lsquic/releases/tag/v4.2.0
Source: [email protected]
https://github.com/ncc-pbottine/QUIC-Hash-Dos-Advisory
Source: [email protected]
https://xxhash.com

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.3MEDIUMmitre
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-407

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