---
title: "CVE-2019-9735\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-2019-9735?format=md
keywords: index, follow
---

# CVE-2019-9735

Publication date 12 March 2019

Last updated 25 August 2025

---

Ubuntu priority

**Medium**

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

## Cvss 3 Severity Score

**6.5 · Medium**

[Score breakdown](https://ubuntu.com/security/CVE-2019-9735?format=md#impact-score)

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## Description

An issue was discovered in the iptables firewall module in OpenStack
Neutron before 10.0.8, 11.x before 11.0.7, 12.x before 12.0.6, and 13.x
before 13.0.3. By setting a destination port in a security group rule along
with a protocol that doesn't support that option (for example, VRRP), an
authenticated user may block further application of security group rules
for instances from any project/tenant on the compute hosts to which it's
applied. (Only deployments using the iptables security group driver are
affected.)

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| neutron | 19.04 disco | Not affected |
| 18.10 cosmic | Fixed 2:13.0.2-0ubuntu3.4 |
| 18.04 LTS bionic | Fixed 2:12.0.6-0ubuntu1 |
| 16.04 LTS xenial | Fixed 2:8.4.0-0ubuntu7.4 |
| 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-2019-9735?format=md#patch-details)

### 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 |
| --- | --- |
| neutron | * Upstream:   <https://review.openstack.org/640685> * Upstream:   <https://review.openstack.org/640702> * Upstream:   <https://review.openstack.org/640790> * Upstream:   <https://review.openstack.org/640791> |

## Severity score breakdown

CVSS version:
CVSS v3.0

**Base score**

6.5 · Medium

* Base metrics

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

  | Parameter | Value |
  | --- | --- |
  | Base score | 6.5 · Medium |
  | Exploitability score | - |
  | Impact score | - |

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

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-9735)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2019-9735)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2019-9735)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2019-9735)

### Related Ubuntu Security Notices (USN)

+ [USN-4036-1](https://usn.ubuntu.com/USN-4036-1)
+ OpenStack Neutron vulnerability
+ 25 June 2019

### Other references

* <https://seclists.org/oss-sec/2019/q1/183>
* <https://www.cve.org/CVERecord?id=CVE-2019-9735>