CVE-2025-24947

EUVD-2025-4635
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.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
mitreCNA
5.3 MEDIUM
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Base Score
CVSS 3.x
EPSS Score
Percentile: Unknown
Early Detection
Affected products identified ahead of NVD analysis through intelligence sources.
VendorProductVersionSource
litespeedtechlsquic
𝑥
< 4.2.0
CNA
Common Weakness Enumeration
References
https://github.com/litespeedtech/lsquic/releases/tag/v4.2.0
https://github.com/ncc-pbottine/QUIC-Hash-Dos-Advisory
https://xxhash.com