There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - An issue was discovered in the routes middleware in OpenStack Neutron before 16.4.1, 17.x before 17.2.1,
    and 18.x before 18.1.1. By making API requests involving nonexistent controllers, an authenticated user
    may cause the API worker to consume increasing amounts of memory, resulting in API performance degradation
    or denial of service. (CVE-2021-40797)

The remote Redhat Enterprise Linux 8 host has packages installed that are affected by a vulnerability as referenced in the RHSA-2022:0990 advisory.

    OpenStack Networking (neutron) is a virtual network service for OpenStack.
    Just as OpenStack Compute (nova) provides an API to dynamically request and     configure virtual servers, OpenStack Networking provides an API to     dynamically request and configure virtual networks. These networks connect     'interfaces' from other OpenStack services (e.g. virtual NICs from Compute     VMs). The OpenStack Networking API supports extensions to provide advanced     network capabilities (e.g. QoS, ACLs, network monitoring, etc.)

    Security Fix(es):

    * Routes middleware memory leak for nonexistent controllers     (CVE-2021-40797)

    For more details about the security issue(s), including the impact, a CVSS     score, acknowledgments, and other related information, refer to the CVE     page listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 8 host has packages installed that are affected by a vulnerability as referenced in the RHSA-2022:0996 advisory.

    OpenStack Networking (neutron) is a virtual network service for OpenStack.
    Just as OpenStack Compute (nova) provides an API to dynamically request and     configure virtual servers, OpenStack Networking provides an API to     dynamically request and configure virtual networks. These networks connect     'interfaces' from other OpenStack services (e.g. virtual NICs from Compute     VMs). The OpenStack Networking API supports extensions to provide advanced     network capabilities (e.g. QoS, ACLs, network monitoring, etc.)

    Security Fix(es):

    * Routes middleware memory leak for nonexistent controllers     (CVE-2021-40797)

    For more details about the security issue(s), including the impact, a CVSS     score, acknowledgments, and other related information, refer to the CVE     page listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - An issue was discovered in the routes middleware in OpenStack Neutron before 16.4.1, 17.x before 17.2.1,     and 18.x before 18.1.1. By making API requests involving nonexistent controllers, an authenticated user     may cause the API worker to consume increasing amounts of memory, resulting in API performance degradation     or denial of service. (CVE-2021-40797)

Note that Nessus relies on the presence of the package as reported by the vendor.

The remote Ubuntu 18.04 LTS / 20.04 LTS / 22.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-6067-1 advisory.

    David Sinquin discovered that OpenStack Neutron incorrectly handled the default Open vSwitch firewall     rules. An attacker could possibly use this issue to impersonate the IPv6 addresses of other systems on the     network. This issue only affected Ubuntu 18.04 LTS, and Ubuntu 20.04 LTS. (CVE-2021-20267)

    Jake Yip and Justin Mammarella discovered that OpenStack Neutron incorrectly handled the linuxbridge     driver when ebtables-nft is being used. An attacker could possibly use this issue to impersonate the     hardware addresss of other systems on the network. This issue only affected Ubuntu 18.04 LTS, and Ubuntu     20.04 LTS. (CVE-2021-38598)

    Pavel Toporkov discovered that OpenStack Neutron incorrectly handled extra_dhcp_opts values. An attacker     could possibly use this issue to reconfigure dnsmasq. This issue only affected Ubuntu 18.04 LTS, and     Ubuntu 20.04 LTS. (CVE-2021-40085)

    Slawek Kaplonski discovered that OpenStack Neutron incorrectly handled the routes middleware. An attacker     could possibly use this issue to cause the API worker to consume memory, leading to a denial of service.
    This issue only affected Ubuntu 18.04 LTS, and Ubuntu 20.04 LTS. (CVE-2021-40797)

    It was discovered that OpenStack Neutron incorrectly handled certain queries. A remote authenticated user     could possibly use this issue to cause resource consumption, leading to a denial of service.
    (CVE-2022-3277)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Published	Updated	Severity
433510	SCA: security update for neutron (GHSA-cpx3-696p-3cw9)	Tenable Cloud Security	SCA Checks	8/19/2025	7/2/2026	high
433510	SCA: security update for neutron (GHSA-cpx3-696p-3cw9)	Tenable Self-Hosted Container Security	SCA Checks	8/19/2025	7/2/2026	high
159217	RHEL 8 : Red Hat OpenStack Platform 16.1 (openstack-neutron) (RHSA-2022:0990)	Nessus	Red Hat Local Security Checks	3/25/2022	11/7/2024	medium
159197	RHEL 8 : Red Hat OpenStack Platform 16.2 (openstack-neutron) (RHSA-2022:0996)	Nessus	Red Hat Local Security Checks	3/24/2022	11/7/2024	medium
257832	Linux Distros Unpatched Vulnerability : CVE-2021-40797	Nessus	Misc.	8/27/2025	7/17/2026	medium
175565	Ubuntu 18.04 LTS / 20.04 LTS / 22.04 LTS : OpenStack Neutron vulnerabilities (USN-6067-1)	Nessus	Ubuntu Local Security Checks	5/13/2023	9/3/2025	high

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