# CVE-2020-24490: Denial of service in BlueZ Advisory

> An unauthenticated attacker with adjacent access can cause a denial of service in the BlueZ Bluetooth stack due to improper buffer restrictions.

- **Severity:** Medium 6.5 (`CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 2 Feb 2021
- **Updated:** 4 Aug 2024
- **Also known as:** DEBIAN-CVE-2020-24490, MINI-fp3j-hhgw-hqwh, UBUNTU-CVE-2020-24490

## What is CVE-2020-24490?

CVE-2020-24490 is a medium-severity denial of service vulnerability in BlueZ Advisory, published on 2 Feb 2021. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

Improper buffer restrictions in BlueZ may allow an unauthenticated user to potentially enable denial of service via adjacent access. This affects all Linux kernel versions that support BlueZ.

## Which versions are affected by CVE-2020-24490?

It affects 1 product.


Products: Bluez Bluez.

## How do I fix CVE-2020-24490?

Apply the vendor's patch.

## Is CVE-2020-24490 being exploited?

There is no known exploitation of CVE-2020-24490 in the wild and no public exploit code.

Public exploit code:

- https://github.com/AbrarKhan/linux_CVE-2020-24490-beforePatch (github_poc): https://github.com/AbrarKhan/linux_CVE-2020-24490-beforePatch
- https://github.com/AbrarKhan/Linux-4.19.72_CVE-2020-24490 (github_poc): https://github.com/AbrarKhan/Linux-4.19.72_CVE-2020-24490

## Other vulnerabilities in BlueZ Advisory

- [CVE-2021-43400](https://insights.sbomify.com/CVE-2021-43400/): Use after free in n/a (critical 9.1)
- [CVE-2024-8805](https://insights.sbomify.com/CVE-2024-8805/): BlueZ HID over GATT Profile Improper Access Control Remote Code Execution Vulnerability (high 8.8)
- [CVE-2022-39176](https://insights.sbomify.com/CVE-2022-39176/): Information disclosure in n/a (high 8.8)
- [CVE-2022-39177](https://insights.sbomify.com/CVE-2022-39177/): Denial of service in n/a (high 8.8)
- [CVE-2022-0204](https://insights.sbomify.com/CVE-2022-0204/): Memory corruption in bluez (high 8.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-24490 and fix it if it is affected.

What it is: CVE-2020-24490 is a medium-severity denial of service vulnerability in BlueZ Advisory, published on 2 Feb 2021. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2020-24490 in the wild and no public exploit code.

Affected product: BlueZ Advisory. 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-2020-24490/ (Markdown: https://insights.sbomify.com/CVE-2020-24490/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-24490
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-24490
- OSV: https://osv.dev/vulnerability/CVE-2020-24490

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-24490/
Summaries are generated and may contain mistakes; the official description above is the record.