---
title: "CVE-2019-8921\n    | Ubuntu"
description: Ubuntu is an open source software operating system that runs from the
  desktop, to the cloud, to all your internet connected things.
url: https://ubuntu.com/security/CVE-2019-8921?format=md
keywords: index, follow
---

# CVE-2019-8921

Publication date 29 November 2021

Last updated 25 August 2025

---

Ubuntu priority

**Medium**

[Why this priority?](https://ubuntu.com/security/cves/about#priority )

## Cvss 3 Severity Score

**6.5 · Medium**

[Score breakdown](https://ubuntu.com/security/CVE-2019-8921?format=md#impact-score)

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## 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.

[Read the notes from the security team](https://ubuntu.com/security/CVE-2019-8921?format=md#notes)

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| bluez | 24.10 oracular | Not affected |
| 24.04 LTS noble | Not affected |
| 23.10 mantic | Not affected |
| 23.04 lunar | Not affected |
| 22.10 kinetic | Not affected |
| 22.04 LTS jammy | Not affected |
| 21.10 impish | Not affected |
| 21.04 hirsute | Not affected |
| 20.04 LTS focal | Not affected |
| 18.04 LTS bionic | Fixed 5.48-0ubuntu3.6 |
| 16.04 LTS xenial | Fixed 5.37-0ubuntu5.3+esm5  Ubuntu Pro |
| 14.04 LTS trusty | Ignored end of standard support |

---

* [How can I get the fixes?](https://ubuntu.com/security/cves/about#security)
* [What do statuses mean?](https://ubuntu.com/security/cves/about#statuses)
* [Patch details](https://ubuntu.com/security/CVE-2019-8921?format=md#patch-details)

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## Notes

---

### [mdeslaur](https://launchpad.net/~mdeslaur)

This was fixed in bionic by CVE-2021-41229-pre1.patch

### Patch details

For informational purposes only. We recommend not to cherry-pick updates. [How can I get the fixes?](https://ubuntu.com/security/cves/about#security)

| Package | Patch details |
| --- | --- |
| bluez | * Upstream:   [?id=7bf](https://git.kernel.org/pub/scm/bluetooth/bluez.git/commit/?id=7bf67b32709d828fafa26256b4c78331760c6e93) |

## Severity score breakdown

CVSS version:
CVSS v3.0

**Base score**

6.5 · Medium

* Base metrics

  | Parameter | Value |
  | --- | --- |
  | Attack vector | Adjacent |
  | Attack complexity | Low |
  | Privileges required | None |
  | User interaction | None |
  | Scope | Unchanged |
  | Confidentiality impact | High |
  | Integrity impact | None |
  | Availability impact | None |
* Scores

  | Parameter | Value |
  | --- | --- |
  | Base score | 6.5 · Medium |
  | Exploitability score | - |
  | Impact score | - |

**Vector:** CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-8921)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2019-8921)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2019-8921)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2019-8921)

### Related Ubuntu Security Notices (USN)

+ [USN-7265-1](https://usn.ubuntu.com/USN-7265-1)
+ BlueZ vulnerabilities
+ 12 February 2025

### Other references

* <https://ssd-disclosure.com/ssd-advisory-linux-bluez-information-leak-and-heap-overflow/>
* <https://www.cve.org/CVERecord?id=CVE-2019-8921>