How severe is CVE-2025-24947?

CVE-2025-24947 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability low.

Is CVE-2025-24947 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (45th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2025-24947?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2025-24947 have an EU (EUVD) identifier?

Yes. CVE-2025-24947 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-4635.

When was CVE-2025-24947 published?

CVE-2025-24947 was published on 2025-02-20 and last updated on 2026-06-17.

CVE-2025-24947

CVE-2025-24947 is a medium-severity vulnerability with a CVSS 3.x base score of 5.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-407.

Key facts

Severity: Medium (CVSS 3.x base score 5.3)
EPSS exploit prediction: 1% (45th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-4635
Weakness: CWE-407
Published: 2025-02-20
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2025-24947?: 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.
How severe is CVE-2025-24947?: CVE-2025-24947 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability low.
Is CVE-2025-24947 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (45th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2025-24947?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-24947 have an EU (EUVD) identifier?: Yes. CVE-2025-24947 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-4635.
When was CVE-2025-24947 published?: CVE-2025-24947 was published on 2025-02-20 and last updated on 2026-06-17.

References

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