---
title: "CVE-2017-5420\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-2017-5420?format=md
keywords: index, follow
---

# CVE-2017-5420

Publication date 7 March 2017

Last updated 25 August 2025

---

Ubuntu priority

**Low**

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

## Cvss 3 Severity Score

**6.5 · Medium**

[Score breakdown](https://ubuntu.com/security/CVE-2017-5420?format=md#impact-score)

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## Description

A "javascript:" url loaded by a malicious page can obfuscate its location
by blanking the URL displayed in the addressbar, allowing for an attacker
to spoof an existing page without the malicious page's address being
displayed correctly. This vulnerability affects Firefox < 52.

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| firefox | 17.04 zesty | Fixed 52.0.1+build2-0ubuntu1 |
| 16.10 yakkety | Fixed 52.0+build2-0ubuntu0.16.10.1 |
| 16.04 LTS xenial | Fixed 52.0+build2-0ubuntu0.16.04.1 |
| 14.04 LTS trusty | Fixed 52.0+build2-0ubuntu0.14.04.1 |
| 12.04 LTS precise | Fixed 52.0+build2-0ubuntu0.12.04.1 |

---

* [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**

6.5 · Medium

* Base metrics

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

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

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

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-5420)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2017-5420)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2017-5420)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2017-5420)

### Related Ubuntu Security Notices (USN)

+ [USN-3216-1](https://usn.ubuntu.com/USN-3216-1)
+ Firefox vulnerabilities
+ 7 March 2017

### Other references

* <https://www.mozilla.org/en-US/security/advisories/mfsa2017-05/#CVE-2017-5420>
* <https://www.cve.org/CVERecord?id=CVE-2017-5420>