# CVE-2019-8921: Information disclosure in n/a

> A remote attacker can leak arbitrary heap data from the BlueZ Bluetooth daemon by sending crafted SDP requests, potentially exposing sensitive memory contents.

- **Severity:** Medium 6.5 (`CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N`)
- **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:** 29 Nov 2021
- **Updated:** 15 Apr 2026
- **Also known as:** DEBIAN-CVE-2019-8921, GHSA-69h8-fh92-ch8q, UBUNTU-CVE-2019-8921

## What is CVE-2019-8921?

CVE-2019-8921 is a medium-severity vulnerability in Debian Debian Linux, published on 29 Nov 2021. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

An issue was discovered in bluetoothd in BlueZ through 5.48. The vulnerability lies in the handling of a SVC_ATTR_REQ by the SDP implementation. By crafting a malicious CSTATE, it is possible to trick the server into returning more bytes than the buffer actually holds, resulting in leaking arbitrary heap data. The root cause can be found in the function service_attr_req of sdpd-request.c. The server does not check whether the CSTATE data is the same in consecutive requests, and instead simply trusts that it is the same.

Weakness: CWE-345 (Insufficient Verification of Data Authenticity)

## Which versions are affected by CVE-2019-8921?

It affects 2 products.


Products: Bluez Bluez, Debian Debian Linux.

## How do I fix CVE-2019-8921?

Apply the vendor's patch.

## Is CVE-2019-8921 being exploited?

There is no known exploitation of CVE-2019-8921 in the wild and no public exploit code.

## Other vulnerabilities in Debian Debian Linux

- [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-2019-8921 and fix it if it is affected.

What it is: CVE-2019-8921 is a medium-severity vulnerability in Debian Debian Linux, published on 29 Nov 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-2019-8921 in the wild and no public exploit code.

Affected product: Debian Debian Linux. 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-2019-8921/ (Markdown: https://insights.sbomify.com/CVE-2019-8921/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2019-8921
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2019-8921
- OSV: https://osv.dev/vulnerability/CVE-2019-8921

---
From sbomify Insights: https://insights.sbomify.com/CVE-2019-8921/
Summaries are generated and may contain mistakes; the official description above is the record.