{"id":"CVE-2025-23020","aliases":["EUVD-2025-4585","GHSA-9f57-9rhg-4hvm"],"status":"published","title":"Kwik hash collision vulnerability","description":"An issue was discovered in Kwik before 0.10.1. A hash collision vulnerability (in the hash table used to manage connections) 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).","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":"2026-11-12","score":0.00579,"percentile":0.48133,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-407"],"published":"2025-02-20T00:00:00Z","modified":"2026-10-28T02:31:06Z","fixes":[{"ecosystem":"Maven","package":"tech.kwik:kwik","fixed_in":["0.10.1"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"Maven","package":"tech.kwik:kwik","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.10.1"}]}]},{"source":"osv","ecosystem":"Maven","package":"tech.kwik:kwik","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.10.1"}]}],"versions":["0.10","0.8.10","0.8.11","0.8.12","0.8.13","0.8.3","0.8.4","0.8.5","0.8.6","0.8.7","0.8.8","0.8.9","0.9","0.9.1"]}],"products":[{"vendor":"ptrd","product":"kwik"}],"references":[{"url":"https://github.com/ncc-pbottine/QUIC-Hash-Dos-Advisory","tags":["package","web"]},{"url":"https://github.com/ptrd/kwik/releases/tag/v0.10.1","tags":["web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2025-23020","tags":["advisory"]},{"url":"https://github.com/ptrd/kwik/commit/b0733d72bad76bc5d8df2f4a7792ebb2539ebdc8","tags":["web"]},{"url":"https://github.com/advisories/GHSA-9f57-9rhg-4hvm"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/23xxx/CVE-2025-23020.json","tags":["advisory"]},{"url":"https://github.com/ptrd/kwik","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2025-23020","description":"An issue was discovered in Kwik before 0.10.1. A hash collision vulnerability (in the hash table used to manage connections) 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).","status":"published","published":"2025-02-20T00:00:00Z","modified":"2025-02-20T17:26:01.482Z","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":"2026-11-02T14:32:33.082076Z"}],"euvd":[{"id":"EUVD-2025-4585","description":"An issue was discovered in Kwik before 0.10.1. 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A hash collision vulnerability (in the hash table used to manage connections) 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).","status":"published","published":"2025-02-20T03:32:03Z","modified":"2025-02-20T20:18:52Z","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":"2026-11-02T14:38:32.275316Z"}],"nvd":[{"id":"CVE-2025-23020","description":"An issue was discovered in Kwik before 0.10.1. A hash collision vulnerability (in the hash table used to manage connections) 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).","status":"published","published":"2025-02-20T03:15:12.63Z","modified":"2026-06-17T08:51:29.047Z","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-2025-23020","description":"An issue was discovered in Kwik before 0.10.1. 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