High severity · published Nov 18, 2024
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)…
7.5
CVSS
0.8%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.8% · higher than 57% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
BC
Bitcoin Core · Bitcoin
before 24.0.1 · source: NVD, CISA
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2019-25220
CVE.org
https://www.cve.org/CVERecord?id=CVE-2019-25220
Vendor Advisory
https://bitcoincore.org/en/2024/09/18/disclose-headers-oom
Third Party Advisory
https://en.bitcoin.it/wiki/Common_Vulnerabilities_and_Exposures
Mailing List
https://lists.linuxfoundation.org/pipermail/bitcoin-dev/2019-October/017354.html
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