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CVE-2019-25220

Date: November 17, 2024

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.

Language: C++

Severity Score

Related Resources (5)

https://en.bitcoin.it/wiki/Common_Vulnerabilities_and_Exposures
https://bitcoincore.org/en/2024/09/18/disclose-headers-oom
https://nvd.nist.gov/vuln/detail/CVE-2019-25220
https://lists.linuxfoundation.org/pipermail/bitcoin-dev/2019-October/017354.html
https://www.mend.io/vulnerability-database/CVE-2019-25220

Severity Score

Weakness Type (CWE)

Uncontrolled Resource Consumption

CWE-400

Allocation of Resources Without Limits or Throttling

CWE-770

CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): NONE
Integrity (I): NONE
Availability (A): HIGH

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