Resource exhaustion in Bitcoin Core
CVE-2019-25220
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.008 (55.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 55th percentile — 55.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: 0.000
Affected products
Weakness classification (CWE)
References
- en.bitcoin.it/wiki/Common_Vulnerabilities_and_Exposures (Third Party Advisory)
- bitcoincore.org/en/2024/09/18/disclose-headers-oom (Vendor Advisory)
- lists.linuxfoundation.org/pipermail/bitcoin-dev/2019-October/017354.html (Mailing List)
Frequently asked questions
- What is CVE-2019-25220?
- CVE-2019-25220 is a high-severity vulnerability in Bitcoin Core, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 7.5/10. Published 2024-11-18.
- How severe is CVE-2019-25220?
- High severity. CVSS v3 base score is 7.5 out of 10.