{"id":"CVE-2019-25220","aliases":["EUVD-2019-19368","GHSA-px5f-j76h-8w39"],"status":"published","title":"Bitcoin Core before 24.0.1 allows remote attackers to cause a denial of service (daemon crash)...","description":"Bitcoin Core before 24.0.1 allows remote attackers to cause a denial of service (daemon crash) via a flood of low-difficulty header chains (aka a \"Chain Width Expansion\" attack) because a node does not first verify that a presented chain has enough work before committing to store it.","severity":{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"adp","from":"cve"},"epss":{"day":"2026-11-09","score":0.00817,"percentile":0.57378,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-770"],"published":"2024-11-18T00:00:00Z","modified":"2026-10-24T10:30:26Z","products":[{"vendor":"bitcoin","product":"bitcoin_core"}],"references":[{"url":"https://en.bitcoin.it/wiki/Common_Vulnerabilities_and_Exposures","tags":["Third Party Advisory","advisory"]},{"url":"https://bitcoincore.org/en/2024/09/18/disclose-headers-oom","tags":["Vendor Advisory","advisory"]},{"url":"https://lists.linuxfoundation.org/pipermail/bitcoin-dev/2019-October/017354.html","tags":["Mailing List","article"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2019-25220"},{"url":"https://github.com/advisories/GHSA-px5f-j76h-8w39"}],"sources":{"cve":[{"id":"CVE-2019-25220","description":"Bitcoin Core before 24.0.1 allows remote attackers to cause a denial of service (daemon crash) via a flood of low-difficulty header chains (aka a \"Chain Width Expansion\" attack) because a node does not first verify that a presented chain has enough work before committing to store it.","status":"published","published":"2024-11-18T00:00:00Z","modified":"2024-11-18T16:28:52.209Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"adp"}],"cwes":["CWE-770"],"updated_at":"2026-11-02T14:20:19.399352Z"}],"euvd":[{"id":"EUVD-2019-19368","description":"Bitcoin Core before 24.0.1 allows remote attackers to cause a denial of service (daemon crash) via a flood of low-difficulty header chains (aka a \"Chain Width Expansion\" attack) because a node does not first verify that a presented chain has enough work before committing to store it.","status":"published","published":"2024-11-18T00:00:00Z","modified":"2024-11-18T16:28:52Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-03T00:04:57.054288Z"}],"ghsa":[{"id":"GHSA-px5f-j76h-8w39","title":"Bitcoin Core before 24.0.1 allows remote attackers to cause a denial of service (daemon crash)...","description":"Bitcoin Core before 24.0.1 allows remote attackers to cause a denial of service (daemon crash) via a flood of low-difficulty header chains (aka a \"Chain Width Expansion\" attack) because a node does not first verify that a presented chain has enough work before committing to store it.","status":"published","published":"2024-11-18T06:30:35Z","modified":"2024-11-18T18:30:54Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"cwes":["CWE-770"],"updated_at":"2026-11-02T14:58:52.476096Z"}],"nvd":[{"id":"CVE-2019-25220","description":"Bitcoin Core before 24.0.1 allows remote attackers to cause a denial of service (daemon crash) via a flood of low-difficulty header chains (aka a \"Chain Width Expansion\" attack) because a node does not first verify that a presented chain has enough work before committing to store it.","status":"published","published":"2024-11-18T04:15:04.107Z","modified":"2026-06-17T02:31:46.793Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"secondary"}],"cwes":["CWE-770"],"updated_at":"2026-11-02T14:05:49.934131Z"}],"osv":[{"id":"CVE-2019-25220","description":"Bitcoin Core before 24.0.1 allows remote attackers to cause a denial of service (daemon crash) via a flood of low-difficulty header chains (aka a \"Chain Width Expansion\" attack) because a node does not first verify that a presented chain has enough work before committing to store it.","status":"published","published":"2024-11-18T04:15:04.107Z","modified":"2026-10-24T10:30:26.225813947Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:44:12.363788Z"}]}}