---
title: "CVE-2016-5289\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-2016-5289?format=md
keywords: index, follow
---

# CVE-2016-5289

Publication date 17 November 2016

Last updated 25 August 2025

---

Ubuntu priority

**Medium**

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

## Cvss 3 Severity Score

**9.8 · Critical**

[Score breakdown](https://ubuntu.com/security/CVE-2016-5289?format=md#impact-score)

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## Description

Memory safety bugs were reported in Firefox 49. Some of these bugs showed
evidence of memory corruption and we presume that with enough effort that
some of these could be exploited to run arbitrary code. This vulnerability
affects Firefox < 50.

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| firefox | 16.10 yakkety | Fixed 50.0+build2-0ubuntu0.16.10.2 |
| 16.04 LTS xenial | Fixed 50.0+build2-0ubuntu0.16.04.2 |
| 14.04 LTS trusty | Fixed 50.0+build2-0ubuntu0.14.04.2 |
| 12.04 LTS precise | Fixed 50.0+build2-0ubuntu0.12.04.2 |
| thunderbird | 16.10 yakkety | Not affected |
| 16.04 LTS xenial | Not affected |
| 14.04 LTS trusty | Not in release |
| 12.04 LTS precise | Not affected |

---

* [How can I get the fixes?](https://ubuntu.com/security/cves/about#security)
* [What do statuses mean?](https://ubuntu.com/security/cves/about#statuses)

## Severity score breakdown

CVSS version:
CVSS v3.0

**Base score**

9.8 · Critical

* Base metrics

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

  | Parameter | Value |
  | --- | --- |
  | Base score | 9.8 · Critical |
  | Exploitability score | - |
  | Impact score | - |

**Vector:** CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-5289)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2016-5289)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2016-5289)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2016-5289)

### Related Ubuntu Security Notices (USN)

+ [USN-3124-1](https://usn.ubuntu.com/USN-3124-1)
+ Firefox vulnerabilities
+ 19 November 2016

### Other references

* <https://www.mozilla.org/en-US/security/advisories/mfsa2016-89/>
* <https://www.cve.org/CVERecord?id=CVE-2016-5289>