How severe is CVE-2024-55563?

CVE-2024-55563 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability low.

Is CVE-2024-55563 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (47th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2024-55563?

CVE-2024-55563 affects Bitcoin Bitcoin Core. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2024-55563?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2024-55563 have an EU (EUVD) identifier?

Yes. CVE-2024-55563 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-52810.

When was CVE-2024-55563 published?

CVE-2024-55563 was published on 2024-12-09 and last updated on 2026-06-17.

CVE-2024-55563

CVE-2024-55563 is a medium-severity vulnerability in Bitcoin Bitcoin Core with a CVSS 3.x base score of 5.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-770.

Key facts

Severity: Medium (CVSS 3.x base score 5.3)
EPSS exploit prediction: 1% (47th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2024-52810
Weakness: CWE-770
Affected product: Bitcoin Bitcoin Core
Published: 2024-12-09
Last modified: 2026-06-17

Description

Bitcoin Core through 27.2 allows transaction-relay jamming via an off-chain protocol attack, a related issue to CVE-2024-52913. For example, the outcome of an HTLC (Hashed Timelock Contract) can be changed because a flood of transaction traffic prevents propagation of certain Lightning channel transactions.

Frequently asked questions

What is CVE-2024-55563?: Bitcoin Core through 27.2 allows transaction-relay jamming via an off-chain protocol attack, a related issue to CVE-2024-52913. For example, the outcome of an HTLC (Hashed Timelock Contract) can be changed because a flood of transaction traffic prevents propagation of certain Lightning channel transactions.
How severe is CVE-2024-55563?: CVE-2024-55563 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability low.
Is CVE-2024-55563 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (47th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2024-55563?: CVE-2024-55563 affects Bitcoin Bitcoin Core. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2024-55563?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2024-55563 have an EU (EUVD) identifier?: Yes. CVE-2024-55563 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-52810.
When was CVE-2024-55563 published?: CVE-2024-55563 was published on 2024-12-09 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:bitcoin:bitcoin_core:*:*:*:*:*:*:*:*

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