# CVE-2023-3637: Openstack-neutron: unrestricted creation of security groups (fix for cve-2022-3277) > An authenticated user can cause denial of service by creating unconstrained security groups via invalid project queries in OpenStack Neutron. - **Severity:** Medium 4.3 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L`) - **Exploited in the wild:** Not known - **Login needed:** Any signed-in user - **Attackable:** Over the internet - **Victim action needed:** Not needed - **Fix available:** Yes - **Published:** 25 Jul 2023 - **Updated:** 20 Nov 2025 - **Also known as:** GHSA-r3jh-qhgj-gvr8, PYSEC-2026-1694, RHSA-2023:4283, UBUNTU-CVE-2023-3637 ## What is CVE-2023-3637? CVE-2023-3637 is a medium-severity denial of service vulnerability in Red Hat OpenStack Platform 13 (Queens) Operational Tools, published on 25 Jul 2023. Any signed-in user can exploit it over the network, with no action from the victim. ### Official description An uncontrolled resource consumption flaw was found in openstack-neutron. This flaw allows a remote authenticated user to query a list of security groups for an invalid project. This issue creates resources that are unconstrained by the user's quota. If a malicious user were to submit a significant number of requests, this could lead to a denial of service. Weakness: CWE-400 (Uncontrolled Resource Consumption) ## Which versions are affected by CVE-2023-3637? 3 open source packages ship an affected version, including neutron. It affects 1 product. | Package | Ecosystem | Affected | Fixed in | | --- | --- | --- | --- | | `neutron` | PyPI | All versions to 22.0.2 | None | | `neutron` | PyPI | All versions to 22.0.2 | None | | `neutron` | PyPI | All versions to 22.0.2 | None | | `openstack-neutron` | Red Hat:openstack:16.2::el8 | All versions | 1:15.3.5-2.20230216175503.el8ost | | `openstack-neutron-common` | Red Hat:openstack:16.2::el8 | All versions | 1:15.3.5-2.20230216175503.el8ost | | `openstack-neutron-linuxbridge` | Red Hat:openstack:16.2::el8 | All versions | 1:15.3.5-2.20230216175503.el8ost | | `openstack-neutron-macvtap-agent` | Red Hat:openstack:16.2::el8 | All versions | 1:15.3.5-2.20230216175503.el8ost | | `openstack-neutron-metering-agent` | Red Hat:openstack:16.2::el8 | All versions | 1:15.3.5-2.20230216175503.el8ost | | `openstack-neutron-ml2` | Red Hat:openstack:16.2::el8 | All versions | 1:15.3.5-2.20230216175503.el8ost | | `openstack-neutron-openvswitch` | Red Hat:openstack:16.2::el8 | All versions | 1:15.3.5-2.20230216175503.el8ost | | `openstack-neutron-rpc-server` | Red Hat:openstack:16.2::el8 | All versions | 1:15.3.5-2.20230216175503.el8ost | | `openstack-neutron-sriov-nic-agent` | Red Hat:openstack:16.2::el8 | All versions | 1:15.3.5-2.20230216175503.el8ost | | `python3-neutron` | Red Hat:openstack:16.2::el8 | All versions | 1:15.3.5-2.20230216175503.el8ost | Products: Redhat Openstack Platform. ## How do I fix CVE-2023-3637? Apply the vendor's patch. ## Is CVE-2023-3637 being exploited? There is no known exploitation of CVE-2023-3637 in the wild and no public exploit code. ## Other vulnerabilities in Red Hat OpenStack Platform 13 (Queens) Operational Tools - [CVE-2020-10731](https://insights.sbomify.com/CVE-2020-10731/): Misconfiguration in nova libvirt container provided by the Red Hat OpenStack Platform (critical 9.9) - [CVE-2024-8007](https://insights.sbomify.com/CVE-2024-8007/): Openstack-tripleo-common: rhosp director disables tls verification for registry mirrors (high 8.1) - [CVE-2017-15114](https://insights.sbomify.com/CVE-2017-15114/): Missing authorization in n/a (high 8.1) - [CVE-2022-3596](https://insights.sbomify.com/CVE-2022-3596/): Instack-undercloud: rsync leaks information to undercloud (high 7.5) - [CVE-2023-6725](https://insights.sbomify.com/CVE-2023-6725/): Tripleo-ansible: bind keys are world readable (medium 5.5) ## Fix prompt for AI coding agents ```text Check this codebase for CVE-2023-3637 and fix it if it is affected. What it is: CVE-2023-3637 is a medium-severity denial of service vulnerability in Red Hat OpenStack Platform 13 (Queens) Operational Tools, published on 25 Jul 2023. Any signed-in user can exploit it over the network, with no action from the victim. Exploitation: There is no known exploitation of CVE-2023-3637 in the wild and no public exploit code. Affected packages and fixed versions: - neutron (PyPI): affected all versions up to 22.0.2; no fix listed - neutron (PyPI): affected all versions up to 22.0.2; no fix listed - neutron (PyPI): affected all versions up to 22.0.2; no fix listed Task: 1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies. 2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it. 3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead. 4. Run the tests and summarise what changed and why. 5. If nothing in the project is affected, say so and change nothing. Reference: https://insights.sbomify.com/CVE-2023-3637/ (Markdown: https://insights.sbomify.com/CVE-2023-3637/index.md) ``` ## Sources - CVE record: https://www.cve.org/CVERecord?id=CVE-2023-3637 - NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-3637 - OSV: https://osv.dev/vulnerability/CVE-2023-3637 --- From sbomify Insights: https://insights.sbomify.com/CVE-2023-3637/ Summaries are generated and may contain mistakes; the official description above is the record.