{"id":"CVE-2025-61684","summary":"Quicly has assertion failures","details":"Quicly, an IETF QUIC protocol implementation, is susceptible to a denial-of-service attack prior to commit d9d3df6a8530a102b57d840e39b0311ce5c9e14e. A remote attacker can exploit these bugs to trigger an assertion failure that crashes process using Quicly. Commit d9d3df6a8530a102b57d840e39b0311ce5c9e14e fixes the issue.","aliases":["GHSA-wr3c-345m-43v9"],"modified":"2026-01-28T05:51:21.858343Z","published":"2026-01-19T15:18:11.398Z","database_specific":{"cwe_ids":["CWE-20"],"cna_assigner":"GitHub_M","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/61xxx/CVE-2025-61684.json"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/61xxx/CVE-2025-61684.json"},{"type":"FIX","url":"https://github.com/h2o/quicly/commit/d9d3df6a8530a102b57d840e39b0311ce5c9e14e"},{"type":"ADVISORY","url":"https://github.com/h2o/quicly/security/advisories/GHSA-wr3c-345m-43v9"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-61684"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/h2o/quicly","events":[{"introduced":"0"},{"fixed":"d9d3df6a8530a102b57d840e39b0311ce5c9e14e"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-61684.json","vanir_signatures":[{"digest":{"function_hash":"330447917234780715116884208818365419057","length":1435},"source":"https://github.com/h2o/quicly/commit/d9d3df6a8530a102b57d840e39b0311ce5c9e14e","id":"CVE-2025-61684-2d5cd368","target":{"function":"test_downstream","file":"t/lossy.c"},"signature_version":"v1","signature_type":"Function","deprecated":false},{"digest":{"threshold":0.9,"line_hashes":["29778764246675025856098287081834208603","100556119729017067749899313415801560323","309327536604343248030770973674050488051","54418473788405938332397646685727076168","171735076972988658971545600294582869474","33795088715017983417874223491481568343","231906130147037159758969149546923583390","308686423491702292545260722868580531111","241648440781633153404342609770655118268","105622321042226638393878150047624306823","155273014357286839408684094503056897596","288173772266509228024676830257721562994","31299942521313456959458018990298007684","314754947702479338109659742408044644131","62085115535628162648245723803311997085","58890052678731420123464246477292725518","214521790195536418809799172346847870416","114806600391115879909008303043282378963"]},"source":"https://github.com/h2o/quicly/commit/d9d3df6a8530a102b57d840e39b0311ce5c9e14e","id":"CVE-2025-61684-4db8ab0c","target":{"file":"t/lossy.c"},"signature_version":"v1","signature_type":"Line","deprecated":false},{"digest":{"function_hash":"170338641696832950255584837203458839758","length":1688},"source":"https://github.com/h2o/quicly/commit/d9d3df6a8530a102b57d840e39b0311ce5c9e14e","id":"CVE-2025-61684-7e6b68fb","target":{"function":"test_bidirectional","file":"t/lossy.c"},"signature_version":"v1","signature_type":"Function","deprecated":false}]}}],"schema_version":"1.7.3","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}]}