CVE-2025-24947

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.

Category

5.3
CVSS
Severity: Medium
CVSS 3.1 •
EPSS 0.05%
Affected: litespeedtech LSQUIC
Published at:
Updated at:

References

Link Tags
https://xxhash.com
https://github.com/ncc-pbottine/QUIC-Hash-Dos-Advisory
https://github.com/litespeedtech/lsquic/releases/tag/v4.2.0

Frequently Asked Questions

What is the severity of CVE-2025-24947?
CVE-2025-24947 has been scored as a medium severity vulnerability.
How to fix CVE-2025-24947?
To fix CVE-2025-24947, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2025-24947 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2025-24947 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2025-24947?
CVE-2025-24947 affects litespeedtech LSQUIC.
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