---
title: "CVE-2015-4495\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-2015-4495?format=md
keywords: index, follow
---

# CVE-2015-4495

Publication date 7 August 2015

Last updated 25 August 2025

---

Ubuntu priority

**Medium**

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

## Cvss 3 Severity Score

**8.8 · High**

[Score breakdown](https://ubuntu.com/security/CVE-2015-4495?format=md#impact-score)

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## Description

The PDF reader in Mozilla Firefox before 39.0.3, Firefox ESR 38.x before
38.1.1, and Firefox OS before 2.2 allows remote attackers to bypass the
Same Origin Policy, and read arbitrary files or gain privileges, via
vectors involving crafted JavaScript code and a native setter, as exploited
in the wild in August 2015.

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| firefox | 15.04 vivid | Fixed 39.0.3+build2-0ubuntu0.15.04.1 |
| 14.04 LTS trusty | Fixed 39.0.3+build2-0ubuntu0.14.04.1 |
| 12.04 LTS precise | Fixed 39.0.3+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**

8.8 · High

* Base metrics

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

  | Parameter | Value |
  | --- | --- |
  | Base score | 8.8 · High |
  | Exploitability score | - |
  | Impact score | - |

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

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-4495)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2015-4495)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2015-4495)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2015-4495)

### Related Ubuntu Security Notices (USN)

+ [USN-2707-1](https://usn.ubuntu.com/USN-2707-1)
+ Firefox vulnerability
+ 7 August 2015

### Other references

* <https://www.mozilla.org/en-US/security/advisories/mfsa2015-78/>
* <https://www.cve.org/CVERecord?id=CVE-2015-4495>
* <https://www.cisa.gov/known-exploited-vulnerabilities-catalog>