# CVE-2021-3588: memory contents disclosure in cli_feat_read_cb

> An attacker can read sensitive memory contents due to missing bounds checks in the BlueZ Bluetooth stack's GATT database handler.

- **Severity:** Low 3.3 (`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 10 Jun 2021
- **Updated:** 16 Sep 2024
- **Also known as:** AZL-7183, DEBIAN-CVE-2021-3588, GHSA-3h8m-q4x3-3fhw, OESA-2021-1254, SUSE-SU-2021:2459-1, UBUNTU-CVE-2021-3588, openSUSE-SU-2021:2459-1

## What is CVE-2021-3588?

CVE-2021-3588 is a low-severity vulnerability in BlueZ, published on 10 Jun 2021. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

The cli_feat_read_cb() function in src/gatt-database.c does not perform bounds checks on the 'offset' variable before using it as an index into an array for reading.

Weakness: CWE-788 (Access of Memory Location After End of Buffer), CWE-125 (Out-of-bounds Read)

## Which versions are affected by CVE-2021-3588?

It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `bluez` | SUSE:Linux Enterprise Module for Basesystem 15 SP3 | All versions | 5.55-3.6.1 |
| `bluez` | SUSE:Linux Enterprise Module for Desktop Applications 15 SP3 | All versions | 5.55-3.6.1 |
| `bluez` | SUSE:Linux Enterprise Workstation Extension 15 SP3 | All versions | 5.55-3.6.1 |
| `bluez` | openSUSE:Leap 15.3 | All versions | 5.55-3.6.1 |

Products: Bluez Bluez.

## How do I fix CVE-2021-3588?

Apply the vendor's patch.

## Is CVE-2021-3588 being exploited?

There is no known exploitation of CVE-2021-3588 in the wild and no public exploit code.

## Other vulnerabilities in BlueZ

- [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-2021-3588 and fix it if it is affected.

What it is: CVE-2021-3588 is a low-severity vulnerability in BlueZ, published on 10 Jun 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-2021-3588 in the wild and no public exploit code.

Affected product: BlueZ. 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-2021-3588/ (Markdown: https://insights.sbomify.com/CVE-2021-3588/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-3588
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-3588
- OSV: https://osv.dev/vulnerability/CVE-2021-3588

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-3588/
Summaries are generated and may contain mistakes; the official description above is the record.