CVE-2025-24947 Denial of service in LSQUIC
Remote attackers can cause high CPU load and denial of service in LSQUIC servers by exploiting hash collisions in connection management.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-24947?
CVE-2025-24947 is a medium-severity denial of service vulnerability in litespeedtech LSQUIC, published on 20 Feb 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-407
Which versions are affected by CVE-2025-24947?
How do I fix CVE-2025-24947?
No fix has been published for CVE-2025-24947 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2025-24947 being exploited?
There is no known exploitation of CVE-2025-24947 in the wild and no public exploit code.
Sources
Also known as GHSA-ghgv-34p7-4r7x.