---
title: "CVE-2017-17051\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-2017-17051?format=md
keywords: index, follow
---

# CVE-2017-17051

Publication date 5 December 2017

Last updated 25 August 2025

---

Ubuntu priority

**Medium**

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

## Cvss 3 Severity Score

**8.6 · High**

[Score breakdown](https://ubuntu.com/security/CVE-2017-17051?format=md#impact-score)

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## Description

An issue was discovered in the default FilterScheduler in OpenStack Nova
16.0.3. By repeatedly rebuilding an instance with new images, an
authenticated user may consume untracked resources on a hypervisor host
leading to a denial of service, aka doubled resource allocations. This
regression was introduced with the fix for OSSA-2017-005 (CVE-2017-16239);
however, only Nova stable/pike or later deployments with that fix applied
and relying on the default FilterScheduler are affected.

[Read the notes from the security team](https://ubuntu.com/security/CVE-2017-17051?format=md#notes)

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| nova | 18.04 LTS bionic | Not affected |
| 17.10 artful | Fixed 2:16.1.2-0ubuntu1 |
| 17.04 zesty | Ignored end of life |
| 16.04 LTS xenial | Not affected |
| 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)
* [Patch details](https://ubuntu.com/security/CVE-2017-17051?format=md#patch-details)

## Notes

---

### [mdeslaur](https://launchpad.net/~mdeslaur)

only affects pike and later

### Patch details

For informational purposes only. We recommend not to cherry-pick updates. [How can I get the fixes?](https://ubuntu.com/security/cves/about#security)

| Package | Patch details |
| --- | --- |
| nova | * Upstream:   <https://review.openstack.org/521662> * Upstream:   <https://review.openstack.org/523214> |

## Severity score breakdown

CVSS version:
CVSS v3.0

**Base score**

8.6 · High

* Base metrics

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

  | Parameter | Value |
  | --- | --- |
  | Base score | 8.6 · High |
  | Exploitability score | - |
  | Impact score | - |

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

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-17051)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2017-17051)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2017-17051)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2017-17051)

### Other references

* <https://security.openstack.org/ossa/OSSA-2017-006.html>
* <http://www.openwall.com/lists/oss-security/2017/12/05/5>
* <https://www.cve.org/CVERecord?id=CVE-2017-17051>