HOMEVULNERABILITIESCVE-2019-25220
HIGH

CVE-2019-25220

CWE-770Published: November 18, 2024· Updated: Jun 17, 2026

7.5
CVSS v3.1

Official 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.

NVD Source

Technical Analysis

CVE-2019-25220 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 7.5.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected Vendors & Products

bitcoin1 product(s)
bitcoin core
Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

ADVISORYhttps://bitcoincore.org/en/2024/09/18/disclose-headers-oom
ADVISORYhttps://en.bitcoin.it/wiki/Common_Vulnerabilities_and_Exposures

All References (3)

→
https://bitcoincore.org/en/2024/09/18/disclose-headers-oomVendor Advisory
→
https://en.bitcoin.it/wiki/Common_Vulnerabilities_and_ExposuresThird Party Advisory
→
https://lists.linuxfoundation.org/pipermail/bitcoin-dev/2019-October/017354.htmlMailing List

Quick Facts

CVE IDCVE-2019-25220
CVSS Score7.5 / 10
SeverityHIGH
WeaknessCWE-770
CISA KEVNo
Affected1 vendor(s)
PublishedNov 18, 2024

Related CVEs (CWE-770)

CVE-2023-38507
9.8
CVE-2020-37067
9.8
CVE-2022-3456
9.8
CVE-2022-3439
9.8
CVE-2022-3273
9.8
CVE-2018-20033
9.8

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2019-25220 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWatch. CVE data is provided under the NVD usage policy.
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