---
title: "CVE-2016-2820\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-2016-2820?format=md
keywords: index, follow
---

# CVE-2016-2820

Publication date 27 April 2016

Last updated 25 August 2025

---

Ubuntu priority

**Medium**

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

## Cvss 3 Severity Score

**4.3 · Medium**

[Score breakdown](https://ubuntu.com/security/CVE-2016-2820?format=md#impact-score)

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## Description

The Firefox Health Reports (aka FHR or about:healthreport) feature in
Mozilla Firefox before 46.0 does not properly restrict the origin of
events, which makes it easier for remote attackers to modify sharing
preferences by leveraging access to the remote-report IFRAME element.

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| firefox | 16.04 LTS xenial | Fixed 46.0+build5-0ubuntu0.16.04.2 |
| 15.10 wily | Fixed 46.0+build5-0ubuntu0.15.10.2 |
| 14.04 LTS trusty | Fixed 46.0+build5-0ubuntu0.14.04.2 |
| 12.04 LTS precise | Fixed 46.0+build5-0ubuntu0.12.04.2 |
| thunderbird | 16.04 LTS xenial | Not affected |
| 15.10 wily | 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**

4.3 · Medium

* Base metrics

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

  | Parameter | Value |
  | --- | --- |
  | Base score | 4.3 · Medium |
  | Exploitability score | - |
  | Impact score | - |

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

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-2820)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2016-2820)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2016-2820)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2016-2820)

### Related Ubuntu Security Notices (USN)

+ [USN-2936-1](https://usn.ubuntu.com/USN-2936-1)
+ Firefox vulnerabilities
+ 27 April 2016

### Other references

* <https://www.mozilla.org/en-US/security/advisories/mfsa2016-48/>
* <https://www.cve.org/CVERecord?id=CVE-2016-2820>