CVE-2019-25220

7.5 highEPSS 0.8%

High (7.5) in bitcoin bitcoin core. EPSS 0.8% chance of exploitation in the next 30 days.

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

CVSS 3.1

7.5 high

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS: 0.8% chance of exploitation in the next 30 days; higher than 57% of CVEs (scores of 2026-10-31)
CWE: CWE-770
Published: 2024-11-18
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

bitcoin:bitcoin_core

References

https://bitcoincore.org/en/2024/09/18/disclose-headers-oom
https://en.bitcoin.it/wiki/Common_Vulnerabilities_and_Exposures
https://lists.linuxfoundation.org/pipermail/bitcoin-dev/2019-October/017354.html

Check your stack JSON