---
title: "CVE-2017-14032\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-2017-14032?format=md
keywords: index, follow
---

# CVE-2017-14032

Publication date 30 August 2017

Last updated 25 August 2025

---

Ubuntu priority

**Medium**

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

## Cvss 3 Severity Score

**8.1 · High**

[Score breakdown](https://ubuntu.com/security/CVE-2017-14032?format=md#impact-score)

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## Description

ARM mbed TLS before 1.3.21 and 2.x before 2.1.9, if optional authentication
is configured, allows remote attackers to bypass peer authentication via an
X.509 certificate chain with many intermediates. NOTE: although mbed TLS
was formerly known as PolarSSL, the releases shipped with the PolarSSL name
are not affected.

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| mbedtls | 17.04 zesty | Fixed 2.4.2-1ubuntu0.1 |
| 16.04 LTS xenial | Fixed 2.2.1-2ubuntu0.2 |
| 14.04 LTS trusty | Not in release |
| polarssl | 17.04 zesty | Not in release |
| 16.04 LTS xenial | Not in release |
| 14.04 LTS trusty | Not in release |

---

* [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**

8.1 · High

* Base metrics

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

  | Parameter | Value |
  | --- | --- |
  | Base score | 8.1 · High |
  | Exploitability score | - |
  | Impact score | - |

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

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-14032)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2017-14032)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2017-14032)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2017-14032)

### Other references

* <https://tls.mbed.org/tech-updates/security-advisories/mbedtls-security-advisory-2017-02>
* <https://github.com/ARMmbed/mbedtls/commit/31458a18788b0cf0b722acda9bb2f2fe13a3fb32>
* <https://github.com/ARMmbed/mbedtls/commit/d15795acd5074e0b44e71f7ede8bdfe1b48591fc>
* <https://bugs.debian.org/873557>
* <https://www.cve.org/CVERecord?id=CVE-2017-14032>