# CVE-2019-9735: OpenStack Neutron's unsupported dport option prevents applying security groups

Source: https://junglewise.ai/threats/cve-2019-9735-openstack-neutron-s-unsupported-dport-option-prevents-applying  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2019-03-13  
License: CC BY 4.0 with a link back

CVE-2019-9735 · Severity: low · CVSS 3 · Published 2019-03-13

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.)

Technologies: [neutron (PyPI)](https://junglewise.ai/threats/technologies/pypi-neutron). Vendors: [PyPI](https://junglewise.ai/threats/vendors/pypi).

## Quick answers

**Is CVE-2019-9735 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2019-9735 being exploited in the wild.

**How severe is CVE-2019-9735?** Low severity, with a CVSS score of 3, published 13 March 2019.

**Which products and versions are affected?** neutron (PyPI) ECOSYSTEM:introduced=0,fixed=10.0.8, ECOSYSTEM:introduced=12.0.0,fixed=12.0.6,introduced=13.0.0,fixed=13.0.3,introduced=11.0.0,fixed=11.0.7,introduced=0,fixed=10.0.8.

**Is there a fix for CVE-2019-9735?** Yes. neutron (PyPI): upgrade to 10.0.8 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**Am I affected by CVE-2019-9735?** Check whether you run neutron (PyPI) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- neutron (PyPI): upgrade to 10.0.8 or later

  ```sh
  pip install "neutron>=10.0.8"
  ```


## Affected products

- neutron (PyPI) ECOSYSTEM:introduced=0,fixed=10.0.8, ECOSYSTEM:introduced=12.0.0,fixed=12.0.6,introduced=13.0.0,fixed=13.0.3,introduced=11.0.0,fixed=11.0.7,introduced=0,fixed=10.0.8

## Identifiers

- CVE-2019-9735
- GHSA-9773-3fqg-8w25
- PYSEC-2019-190

## Related threats

- [PYSEC-2026-1693 - OpenStack Neutron can use an incorrect ID during policy enforcement](https://junglewise.ai/threats/cve-2024-53916-openstack-neutron-can-use-an-incorrect-id-during-policy)
- [PYSEC-2026-1694 - Denial of service in neutron](https://junglewise.ai/threats/cve-2023-3637-denial-of-service-in-neutron)
- [PYSEC-2026-855 - openstack-neutron uncontrolled resource consumption flaw](https://junglewise.ai/threats/cve-2022-3277-openstack-neutron-uncontrolled-resource-consumption-flaw)
- [PYSEC-2026-851 - OpenStack Neutron Improper Authentication vulnerability](https://junglewise.ai/threats/cve-2014-0056-openstack-neutron-improper-authentication-vulnerability)
- [PYSEC-2026-853 - OpenStack Neutron Race condition vulnerability](https://junglewise.ai/threats/cve-2015-5240-openstack-neutron-race-condition-vulnerability)