CVE-2024-55563

Bitcoin Core through 27.2 allows transaction-relay jamming via an off-chain protocol attack, a...

5.3 Medium

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.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None

What an attacker can affect

Confidentiality: None
Integrity: None
Availability: Low

Exploit likelihood

0.67%Up 0.6 points since Dec 10, 2024

What each source reports

CVE List Score used 5.3

Record: CVE-2024-55563
CVSS 3.1: 5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Weakness: CWE-770
Updated: 2026-11-02

EUVDEUVD-2024-52810 5.3

Record: EUVD-2024-52810
CVSS 3.1: 5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Updated: 2026-11-02

GitHub AdvisoriesGHSA-82x2-v3jv-gmrq No score

Bitcoin Core through 27.2 allows transaction-relay jamming via an off-chain protocol attack, a...

Record: GHSA-82x2-v3jv-gmrq
Updated: 2026-11-02

NVD 5.3

Record: CVE-2024-55563
CVSS 3.1: 5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Weakness: CWE-770
Updated: 2026-11-02

OSV 5.3

Record: CVE-2024-55563
CVSS 3.1: 5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Updated: 2026-11-02

Affected products

bitcoin core

History

History
Recorded	Changed	Sources
Nov 2, 2026	first indexed	CVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2024-55563 is a medium vulnerability (CVSS 5.3) in Bitcoin Core, published December 9, 2024. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.67%, the 52nd percentile. No source names a fixed version.