# CVE-2024-55563: Denial of service in n/a

> Attackers can jam Bitcoin Core transaction relay by flooding traffic, preventing Lightning channel transaction propagation and altering HTLC outcomes.

- **Severity:** Medium 5.3 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 9 Dec 2024
- **Updated:** 4 Mar 2025
- **Also known as:** GHSA-82x2-v3jv-gmrq

## What is CVE-2024-55563?

CVE-2024-55563 is a medium-severity denial of service vulnerability in Bitcoin Bitcoin Core, published on 9 Dec 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official 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.

Weakness: CWE-770 (Allocation of Resources Without Limits or Throttling)

## Which versions are affected by CVE-2024-55563?

It affects 1 product.


Products: Bitcoin Bitcoin Core.

## How do I fix CVE-2024-55563?

No fix has been published for CVE-2024-55563 yet. Limit exposure of the affected software until one is available.

## Is CVE-2024-55563 being exploited?

There is no known exploitation of CVE-2024-55563 in the wild and no public exploit code.

## Other vulnerabilities in Bitcoin Bitcoin Core

- [CVE-2025-46597](https://insights.sbomify.com/CVE-2025-46597/): Integer overflow in n/a (high 7.5)
- [CVE-2025-54604](https://insights.sbomify.com/CVE-2025-54604/): Denial of service in n/a (high 7.5)
- [CVE-2025-54605](https://insights.sbomify.com/CVE-2025-54605/): Denial of service in n/a (high 7.5)
- [CVE-2019-25220](https://insights.sbomify.com/CVE-2019-25220/): Denial of service in n/a (high 7.5)
- [CVE-2024-52912](https://insights.sbomify.com/CVE-2024-52912/): Integer overflow in n/a (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2024-55563 and fix it if it is affected.

What it is: CVE-2024-55563 is a medium-severity denial of service vulnerability in Bitcoin Bitcoin Core, published on 9 Dec 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2024-55563 in the wild and no public exploit code.

Affected product: Bitcoin Bitcoin Core. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2024-55563/ (Markdown: https://insights.sbomify.com/CVE-2024-55563/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2024-55563
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2024-55563
- OSV: https://osv.dev/vulnerability/CVE-2024-55563

---
From sbomify Insights: https://insights.sbomify.com/CVE-2024-55563/
Summaries are generated and may contain mistakes; the official description above is the record.