---
title: "CVE-2017-14494\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-2017-14494?format=md
keywords: index, follow
---

# CVE-2017-14494

Publication date 2 October 2017

Last updated 25 August 2025

---

Ubuntu priority

**Medium**

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

## Cvss 3 Severity Score

**5.9 · Medium**

[Score breakdown](https://ubuntu.com/security/CVE-2017-14494?format=md#impact-score)

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## Description

dnsmasq before 2.78, when configured as a relay, allows remote attackers to
obtain sensitive memory information via vectors involving handling DHCPv6
forwarded requests.

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| dnsmasq | 17.04 zesty | Fixed 2.76-5ubuntu0.1 |
| 16.04 LTS xenial | Fixed 2.75-1ubuntu0.16.04.3 |
| 14.04 LTS trusty | Fixed 2.68-1ubuntu0.2 |

---

* [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**

5.9 · Medium

* Base metrics

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

  | Parameter | Value |
  | --- | --- |
  | Base score | 5.9 · Medium |
  | Exploitability score | - |
  | Impact score | - |

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

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-14494)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2017-14494)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2017-14494)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2017-14494)

### Related Ubuntu Security Notices (USN)

+ [USN-3430-1](https://usn.ubuntu.com/USN-3430-1)
+ Dnsmasq vulnerabilities
+ 2 October 2017

+ [USN-3430-2](https://usn.ubuntu.com/USN-3430-2)
+ Dnsmasq vulnerabilities
+ 3 October 2017

### Other references

* <https://security.googleblog.com/2017/10/behind-masq-yet-more-dns-and-dhcp.html>
* <https://www.cve.org/CVERecord?id=CVE-2017-14494>