{"id":"CVE-2019-25220","details":"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.","modified":"2026-07-08T19:50:40.972006Z","published":"2024-11-18T04:15:04.107Z","references":[{"type":"ADVISORY","url":"https://bitcoincore.org/en/2024/09/18/disclose-headers-oom"},{"type":"ADVISORY","url":"https://en.bitcoin.it/wiki/Common_Vulnerabilities_and_Exposures"},{"type":"ARTICLE","url":"https://lists.linuxfoundation.org/pipermail/bitcoin-dev/2019-October/017354.html"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/bitcoin/bitcoin","events":[{"introduced":"0"},{"fixed":"b3f866a8dfd652b6339b79124843e58bd0bf3013"}],"database_specific":{"cpe":"cpe:2.3:a:bitcoin:bitcoin_core:*:*:*:*:*:*:*:*","extracted_events":[{"introduced":"0"},{"fixed":"24.0.1"}],"source":"CPE_RANGE"}}],"versions":["v24.0","v24.0rc4","v24.0rc3","v24.0rc2","v24.0rc1","v21.99-guixtest1","v0.9.0rc2","noversion","v0.8.0","v0.9.0rc1","v0.8.2","v0.7.1rc1","v0.7.1","v0.8.2rc2","v0.8.2rc3","v0.8.2rc1","v0.8.0rc1","v0.7.0rc3","v0.7.0","v0.7.0rc2","v0.7.0rc1","v0.6.0rc6","v0.6.0","v0.6.1","v0.5.0rc7","v0.5.0","v0.6.1rc2","v0.6.1rc1","v0.6.0rc5","v0.6.0rc4","v0.6.0rc3","v0.4.0","v0.6.0rc2","v0.6.0rc1","v0.5.1rc2","v0.5.1","v0.5.1rc1","v0.5.0rc6","v0.5.0rc5","v0.5.0rc4","v0.5.0rc2","v0.5.0rc1","v0.4.00rc2","v0.4.00rc1","v0.3.24","v0.3.24rc3","v0.3.24rc2","v0.3.24rc1","v0.3.23rc1","v0.3.23","v0.3.22","v0.3.22rc3","v0.3.22rc4","v0.3.22rc2","v0.3.22rc1","v0.3.21","v0.3.21rc","v0.3.20.2_closest","v0.3.20.01_closest","v0.3.20","v0.3.11_notexact","v0.3.8","v0.3.7","v0.3.6","v0.3.3","v0.3.2","v0.3.1","v0.3.1rc1"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2019-25220.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}]}