---
title: "CVE-2017-14062\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-2017-14062?format=md
keywords: index, follow
---

# CVE-2017-14062

Publication date 31 August 2017

Last updated 25 August 2025

---

Ubuntu priority

**Medium**

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

## Cvss 3 Severity Score

**9.8 · Critical**

[Score breakdown](https://ubuntu.com/security/CVE-2017-14062?format=md#impact-score)

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## Description

Integer overflow in the decode\_digit function in puny\_decode.c in Libidn2
before 2.0.4 allows remote attackers to cause a denial of service or
possibly have unspecified other impact.

### From the Ubuntu Security Team

USN-3421-1 fixed a vulnerability in Libidn2. This update
provides the corresponding update for Ubuntu 14.04 ESM.

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| libidn | 22.04 LTS jammy | Not affected |
| 21.10 impish | Not affected |
| 21.04 hirsute | Not affected |
| 20.10 groovy | Not affected |
| 20.04 LTS focal | Not affected |
| 19.10 eoan | Not affected |
| 19.04 disco | Not affected |
| 18.10 cosmic | Not affected |
| 18.04 LTS bionic | Not affected |
| 17.10 artful | Not affected |
| 17.04 zesty | Fixed 1.33-1ubuntu0.1 |
| 16.04 LTS xenial | Fixed 1.32-3ubuntu1.2 |
| 14.04 LTS trusty | Fixed 1.28-1ubuntu2.2 |
| libidn2 | 22.04 LTS jammy | Not affected |
| 21.10 impish | Not affected |
| 21.04 hirsute | Not affected |
| 20.10 groovy | Not affected |
| 20.04 LTS focal | Not affected |
| 19.10 eoan | Not affected |
| 19.04 disco | Not affected |
| 18.10 cosmic | Not affected |
| 18.04 LTS bionic | Not affected |
| 17.10 artful | Not in release |
| 17.04 zesty | Not in release |
| 16.04 LTS xenial | Not in release |
| 14.04 LTS trusty | Not in release |
| libidn2-0 | 22.04 LTS jammy | Not in release |
| 21.10 impish | Not in release |
| 21.04 hirsute | Not in release |
| 20.10 groovy | Not in release |
| 20.04 LTS focal | Not in release |
| 19.10 eoan | Not in release |
| 19.04 disco | Not in release |
| 18.10 cosmic | Not in release |
| 18.04 LTS bionic | Not in release |
| 17.10 artful | Not affected |
| 17.04 zesty | Fixed 0.16-1ubuntu0.1 |
| 16.04 LTS xenial | Fixed 0.10-3ubuntu0.1~esm1  Ubuntu Pro |
| 14.04 LTS trusty | Fixed 0.9-1ubuntu0.1~esm1  Ubuntu Pro |

---

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

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## Severity score breakdown

CVSS version:
CVSS v3.0

**Base score**

9.8 · Critical

* Base metrics

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

  | Parameter | Value |
  | --- | --- |
  | Base score | 9.8 · Critical |
  | Exploitability score | - |
  | Impact score | - |

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

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-14062)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2017-14062)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2017-14062)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2017-14062)

### Related Ubuntu Security Notices (USN)

+ [USN-3434-1](https://usn.ubuntu.com/USN-3434-1)
+ Libidn vulnerability
+ 2 October 2017

+ [USN-3434-2](https://usn.ubuntu.com/USN-3434-2)
+ Libidn vulnerability
+ 23 October 2017

+ [USN-3421-1](https://usn.ubuntu.com/USN-3421-1)
+ Libidn2 vulnerability
+ 18 September 2017

+ [USN-3421-2](https://usn.ubuntu.com/USN-3421-2)
+ Libidn2 vulnerability
+ 15 March 2021

### Other references

* <https://gitlab.com/libidn/libidn2/commit/3284eb342cd0ed1a18786e3fcdf0cdd7e76676bd>
* <https://gitlab.com/libidn/libidn2/blob/master/NEWS>
* <https://www.cve.org/CVERecord?id=CVE-2017-14062>