---
title: "CVE-2015-2741\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-2015-2741?format=md
keywords: index, follow
---

# CVE-2015-2741

Publication date 5 July 2015

Last updated 24 July 2024

---

Ubuntu priority

**Medium**

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

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## Description

Mozilla Firefox before 39.0, Firefox ESR 38.x before 38.1, and Thunderbird
before 38.1 do not enforce key pinning upon encountering an X.509
certificate problem that generates a user dialog, which allows
user-assisted man-in-the-middle attackers to bypass intended access
restrictions by triggering a (1) expired certificate or (2) mismatched
hostname for a domain with pinning enabled.

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| firefox | 15.04 vivid | Fixed 39.0+build5-0ubuntu0.15.04.1 |
| 14.10 utopic | Fixed 39.0+build5-0ubuntu0.14.10.1 |
| 14.04 LTS trusty | Fixed 39.0+build5-0ubuntu0.14.04.1 |
| 12.04 LTS precise | Fixed 39.0+build5-0ubuntu0.12.04.2 |
| thunderbird | 15.04 vivid | Fixed 1:31.8.0+build1-0ubuntu0.15.04.1 |
| 14.10 utopic | Fixed 1:31.8.0+build1-0ubuntu0.14.10.1 |
| 14.04 LTS trusty | Fixed 1:31.8.0+build1-0ubuntu0.14.04.1 |
| 12.04 LTS precise | Fixed 1:31.8.0+build1-0ubuntu0.12.04.1 |

---

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

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-2741)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2015-2741)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2015-2741)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2015-2741)

### Related Ubuntu Security Notices (USN)

+ [USN-2656-1](https://usn.ubuntu.com/USN-2656-1)
+ Firefox vulnerabilities
+ 9 July 2015

+ [USN-2656-2](https://usn.ubuntu.com/USN-2656-2)
+ Firefox vulnerabilities
+ 15 July 2015

### Other references

* <https://www.mozilla.org/en-US/security/advisories/mfsa2015-67/>
* <https://bugzilla.mozilla.org/show_bug.cgi?id=1147497>
* <http://www.mozilla.org/security/announce/2015/mfsa2015-67.html>
* <https://www.cve.org/CVERecord?id=CVE-2015-2741>