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CVE-2025-24947

Date: February 19, 2025

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.

Severity Score

Related Resources (5)

https://xxhash.com
https://github.com/ncc-pbottine/QUIC-Hash-Dos-Advisory
https://nvd.nist.gov/vuln/detail/CVE-2025-24947
https://github.com/litespeedtech/lsquic/releases/tag/v4.2.0
https://www.mend.io/vulnerability-database/CVE-2025-24947

Severity Score

Weakness Type (CWE)

Inefficient Algorithmic Complexity

CWE-407

CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): NONE
Integrity (I): NONE
Availability (A): LOW

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