Is CVE-2019-25220 in the CISA KEV catalog?

No. CVE-2019-25220 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2019-25220?

CVE-2019-25220 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2019-25220?

CVE-2019-25220 has an EPSS score of 0.78% (52th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2019-25220?

Upgrade bitcoin core to 24.0.1 or later.

CVE & CISA-KEV Catalog

CVE-2019-25220

HIGH

7.5

CVSS v3

NVD

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.

CWE-770Allocation of Resources Without Limits or Throttling

How to fix

Remediation Available

bitcoin coreNVD

Affected:< 24.0.1Fixed in:24.0.1CVE-2019-25220derived from NVD

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

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

Exploit Intelligence

0.78%probability of exploitation in 30 days

52ndpercentile

Moderate risk: more likely to be exploited than 52% of all known CVEs.

References

Vendor Advisory1

bitcoincore.org

Third-Party Advisory1

en.bitcoin.it

Mailing List1

lists.linuxfoundation.org

Related Vulnerabilities

Other CWE-770 (Allocation of Resources Without Limits or Throttling) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2023-50387	High	7.5	100%	-	Fix
CVE-2019-11478	Medium	5.3	95%	-	Fix
CVE-2019-11479	High	7.5	92%	-	Fix
CVE-2024-27316	High	7.5	91%	-	Fix
CVE-2022-30522	High	7.5	90%	-	Fix
CVE-2019-9515	High	7.5	88%	-	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2025-05-22.