{"id":"CVE-2025-24947","aliases":["EUVD-2025-4635","GHSA-ghgv-34p7-4r7x"],"status":"published","title":"A hash collision vulnerability (in the hash table used to manage connections) in LSQUIC (aka...","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.","severity":{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.00679,"percentile":0.52672,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-407"],"published":"2025-02-20T00:00:00Z","modified":"2026-10-28T10:51:32Z","products":[{"vendor":"litespeedtech","product":"lsquic"}],"references":[{"url":"https://xxhash.com","tags":["web"]},{"url":"https://github.com/ncc-pbottine/QUIC-Hash-Dos-Advisory","tags":["package"]},{"url":"https://github.com/litespeedtech/lsquic/releases/tag/v4.2.0","tags":["web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2025-24947","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-ghgv-34p7-4r7x"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/24xxx/CVE-2025-24947.json","tags":["advisory"]}],"sources":{"cve":[{"id":"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.","status":"published","published":"2025-02-20T00:00:00Z","modified":"2025-02-20T20:19:05.607Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium","assessor":"cna"}],"cwes":["CWE-407"],"updated_at":"2026-11-02T14:32:43.770144Z"}],"euvd":[{"id":"EUVD-2025-4635","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.","status":"published","published":"2025-02-20T00:00:00Z","modified":"2025-02-20T20:19:05Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium"}],"updated_at":"2026-11-02T20:53:26.353093Z"}],"ghsa":[{"id":"GHSA-ghgv-34p7-4r7x","title":"A hash collision vulnerability (in the hash table used to manage connections) in LSQUIC (aka...","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.","status":"published","published":"2025-02-20T03:32:03Z","modified":"2025-02-20T03:32:13Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium"}],"cwes":["CWE-407"],"updated_at":"2026-11-02T14:59:59.716099Z"}],"nvd":[{"id":"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.","status":"published","published":"2025-02-20T03:15:12.943Z","modified":"2026-06-17T08:59:52.25Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium","assessor":"secondary"}],"cwes":["CWE-407"],"updated_at":"2026-11-02T14:10:51.871789Z"}],"osv":[{"id":"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.","status":"published","published":"2025-02-20T00:00:00Z","modified":"2026-10-28T10:51:32.577347148Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium"}],"cwes":["CWE-407"],"updated_at":"2026-11-02T15:44:47.386092Z"}]}}