ubuntu-cve-2021-40085
Vulnerability from osv_ubuntu
Published
2021-08-31 15:00
Modified
2025-10-24 04:50
Summary
Details
An issue was discovered in OpenStack Neutron before 16.4.1, 17.x before 17.2.1, and 18.x before 18.1.1. Authenticated attackers can reconfigure dnsmasq via a crafted extra_dhcp_opts value.
Severity
6.5 (Medium)
N/A (UNKNOWN)
References
| URL | Type | |
|---|---|---|
{
"affected": [
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "neutron-bgp-dragent",
"binary_version": "2:8.4.0-0ubuntu7.5"
},
{
"binary_name": "neutron-common",
"binary_version": "2:8.4.0-0ubuntu7.5"
},
{
"binary_name": "neutron-dhcp-agent",
"binary_version": "2:8.4.0-0ubuntu7.5"
},
{
"binary_name": "neutron-l3-agent",
"binary_version": "2:8.4.0-0ubuntu7.5"
},
{
"binary_name": "neutron-linuxbridge-agent",
"binary_version": "2:8.4.0-0ubuntu7.5"
},
{
"binary_name": "neutron-macvtap-agent",
"binary_version": "2:8.4.0-0ubuntu7.5"
},
{
"binary_name": "neutron-metadata-agent",
"binary_version": "2:8.4.0-0ubuntu7.5"
},
{
"binary_name": "neutron-metering-agent",
"binary_version": "2:8.4.0-0ubuntu7.5"
},
{
"binary_name": "neutron-openvswitch-agent",
"binary_version": "2:8.4.0-0ubuntu7.5"
},
{
"binary_name": "neutron-plugin-linuxbridge-agent",
"binary_version": "2:8.4.0-0ubuntu7.5"
},
{
"binary_name": "neutron-plugin-ml2",
"binary_version": "2:8.4.0-0ubuntu7.5"
},
{
"binary_name": "neutron-plugin-openvswitch-agent",
"binary_version": "2:8.4.0-0ubuntu7.5"
},
{
"binary_name": "neutron-plugin-sriov-agent",
"binary_version": "2:8.4.0-0ubuntu7.5"
},
{
"binary_name": "neutron-server",
"binary_version": "2:8.4.0-0ubuntu7.5"
},
{
"binary_name": "neutron-sriov-agent",
"binary_version": "2:8.4.0-0ubuntu7.5"
},
{
"binary_name": "python-neutron",
"binary_version": "2:8.4.0-0ubuntu7.5"
}
]
},
"package": {
"ecosystem": "Ubuntu:16.04:LTS",
"name": "neutron",
"purl": "pkg:deb/ubuntu/neutron@2:8.4.0-0ubuntu7.5?arch=source\u0026distro=xenial"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2:7.0.0-0ubuntu1",
"2:8.0.0~b1-0ubuntu2",
"2:8.0.0~b2-0ubuntu4",
"2:8.0.0~b2-0ubuntu5",
"2:8.0.0~b2-0ubuntu7",
"2:8.0.0~b3-0ubuntu1",
"2:8.0.0~rc1-0ubuntu1",
"2:8.0.0-0ubuntu1",
"2:8.1.0-0ubuntu0.16.04.2",
"2:8.1.2-0ubuntu1",
"2:8.2.0-0ubuntu1",
"2:8.3.0-0ubuntu1",
"2:8.3.0-0ubuntu1.1",
"2:8.3.0-0ubuntu1.2",
"2:8.4.0-0ubuntu1",
"2:8.4.0-0ubuntu2",
"2:8.4.0-0ubuntu3",
"2:8.4.0-0ubuntu4",
"2:8.4.0-0ubuntu5",
"2:8.4.0-0ubuntu6",
"2:8.4.0-0ubuntu7.1",
"2:8.4.0-0ubuntu7.2",
"2:8.4.0-0ubuntu7.3",
"2:8.4.0-0ubuntu7.4",
"2:8.4.0-0ubuntu7.5"
]
},
{
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "neutron-common",
"binary_version": "2:12.1.1-0ubuntu8.1"
},
{
"binary_name": "neutron-dhcp-agent",
"binary_version": "2:12.1.1-0ubuntu8.1"
},
{
"binary_name": "neutron-l3-agent",
"binary_version": "2:12.1.1-0ubuntu8.1"
},
{
"binary_name": "neutron-linuxbridge-agent",
"binary_version": "2:12.1.1-0ubuntu8.1"
},
{
"binary_name": "neutron-macvtap-agent",
"binary_version": "2:12.1.1-0ubuntu8.1"
},
{
"binary_name": "neutron-metadata-agent",
"binary_version": "2:12.1.1-0ubuntu8.1"
},
{
"binary_name": "neutron-metering-agent",
"binary_version": "2:12.1.1-0ubuntu8.1"
},
{
"binary_name": "neutron-openvswitch-agent",
"binary_version": "2:12.1.1-0ubuntu8.1"
},
{
"binary_name": "neutron-plugin-linuxbridge-agent",
"binary_version": "2:12.1.1-0ubuntu8.1"
},
{
"binary_name": "neutron-plugin-ml2",
"binary_version": "2:12.1.1-0ubuntu8.1"
},
{
"binary_name": "neutron-plugin-openvswitch-agent",
"binary_version": "2:12.1.1-0ubuntu8.1"
},
{
"binary_name": "neutron-plugin-sriov-agent",
"binary_version": "2:12.1.1-0ubuntu8.1"
},
{
"binary_name": "neutron-server",
"binary_version": "2:12.1.1-0ubuntu8.1"
},
{
"binary_name": "neutron-sriov-agent",
"binary_version": "2:12.1.1-0ubuntu8.1"
},
{
"binary_name": "python-neutron",
"binary_version": "2:12.1.1-0ubuntu8.1"
}
]
},
"package": {
"ecosystem": "Ubuntu:18.04:LTS",
"name": "neutron",
"purl": "pkg:deb/ubuntu/neutron@2:12.1.1-0ubuntu8.1?arch=source\u0026distro=bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "2:12.1.1-0ubuntu8.1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2:11.0.1-0ubuntu1",
"2:12.0.0~b1-0ubuntu1",
"2:12.0.0~b1-0ubuntu2",
"2:12.0.0~b2-0ubuntu1",
"2:12.0.0~b3-0ubuntu1",
"2:12.0.0~rc1-0ubuntu1",
"2:12.0.0~rc2-0ubuntu1",
"2:12.0.0-0ubuntu1",
"2:12.0.0-0ubuntu1.1",
"2:12.0.0-0ubuntu1.2",
"2:12.0.0-0ubuntu1.3",
"2:12.0.0-0ubuntu1.4",
"2:12.0.0-0ubuntu2",
"2:12.0.0-0ubuntu3",
"2:12.0.1-0ubuntu1",
"2:12.0.1-0ubuntu1.1",
"2:12.0.2-0ubuntu1",
"2:12.0.3-0ubuntu1",
"2:12.0.5-0ubuntu1",
"2:12.0.5-0ubuntu4",
"2:12.0.5-0ubuntu5",
"2:12.0.6-0ubuntu1",
"2:12.0.6-0ubuntu2",
"2:12.0.6-0ubuntu3",
"2:12.1.0-0ubuntu1",
"2:12.1.1-0ubuntu1",
"2:12.1.1-0ubuntu2",
"2:12.1.1-0ubuntu3",
"2:12.1.1-0ubuntu4",
"2:12.1.1-0ubuntu7",
"2:12.1.1-0ubuntu8"
]
},
{
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "neutron-common",
"binary_version": "2:16.4.2-0ubuntu6.2"
},
{
"binary_name": "neutron-dhcp-agent",
"binary_version": "2:16.4.2-0ubuntu6.2"
},
{
"binary_name": "neutron-l3-agent",
"binary_version": "2:16.4.2-0ubuntu6.2"
},
{
"binary_name": "neutron-linuxbridge-agent",
"binary_version": "2:16.4.2-0ubuntu6.2"
},
{
"binary_name": "neutron-macvtap-agent",
"binary_version": "2:16.4.2-0ubuntu6.2"
},
{
"binary_name": "neutron-metadata-agent",
"binary_version": "2:16.4.2-0ubuntu6.2"
},
{
"binary_name": "neutron-metering-agent",
"binary_version": "2:16.4.2-0ubuntu6.2"
},
{
"binary_name": "neutron-openvswitch-agent",
"binary_version": "2:16.4.2-0ubuntu6.2"
},
{
"binary_name": "neutron-ovn-metadata-agent",
"binary_version": "2:16.4.2-0ubuntu6.2"
},
{
"binary_name": "neutron-plugin-ml2",
"binary_version": "2:16.4.2-0ubuntu6.2"
},
{
"binary_name": "neutron-server",
"binary_version": "2:16.4.2-0ubuntu6.2"
},
{
"binary_name": "neutron-sriov-agent",
"binary_version": "2:16.4.2-0ubuntu6.2"
},
{
"binary_name": "python3-neutron",
"binary_version": "2:16.4.2-0ubuntu6.2"
}
]
},
"package": {
"ecosystem": "Ubuntu:20.04:LTS",
"name": "neutron",
"purl": "pkg:deb/ubuntu/neutron@2:16.4.2-0ubuntu6.2?arch=source\u0026distro=focal"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "2:16.4.2-0ubuntu6.2"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2:15.0.0-0ubuntu1",
"2:16.0.0~b1~git2019121613.3e8abb9a8f-0ubuntu1",
"2:16.0.0~b2~git2020020712.d5b33ffc77-0ubuntu1",
"2:16.0.0~b2~git2020020712.d5b33ffc77-0ubuntu3",
"2:16.0.0~b3~git2020032420.a0e1b5804e-0ubuntu1",
"2:16.0.0~b3~git2020032420.a0e1b5804e-0ubuntu2",
"2:16.0.0~b3~git2020032420.a0e1b5804e-0ubuntu3",
"2:16.0.0~b3~git2020032420.a0e1b5804e-0ubuntu4",
"2:16.0.0~b3~git2020041013.e74c8f8c88-0ubuntu1",
"2:16.0.0~b3~git2020041516.5f42488a9a-0ubuntu1",
"2:16.0.0~b3~git2020041516.5f42488a9a-0ubuntu2",
"2:16.0.0-0ubuntu0.20.04.1",
"2:16.0.0-0ubuntu0.20.04.2",
"2:16.1.0-0ubuntu1",
"2:16.1.0-0ubuntu2",
"2:16.2.0-0ubuntu1",
"2:16.2.0-0ubuntu2",
"2:16.2.0-0ubuntu3",
"2:16.3.0-0ubuntu3",
"2:16.3.1-0ubuntu1",
"2:16.3.1-0ubuntu1.1",
"2:16.3.2-0ubuntu2",
"2:16.3.2-0ubuntu3",
"2:16.4.0-0ubuntu2",
"2:16.4.0-0ubuntu3",
"2:16.4.1-0ubuntu2",
"2:16.4.2-0ubuntu1",
"2:16.4.2-0ubuntu2",
"2:16.4.2-0ubuntu3",
"2:16.4.2-0ubuntu4",
"2:16.4.2-0ubuntu5",
"2:16.4.2-0ubuntu6",
"2:16.4.2-0ubuntu6.1"
]
}
],
"aliases": [],
"details": "An issue was discovered in OpenStack Neutron before 16.4.1, 17.x before 17.2.1, and 18.x before 18.1.1. Authenticated attackers can reconfigure dnsmasq via a crafted extra_dhcp_opts value.",
"id": "UBUNTU-CVE-2021-40085",
"modified": "2025-10-24T04:50:34Z",
"published": "2021-08-31T15:00:00Z",
"references": [
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2021-40085"
},
{
"type": "ADVISORY",
"url": "https://ubuntu.com/security/notices/USN-6067-1"
},
{
"type": "REPORT",
"url": "https://www.cve.org/CVERecord?id=CVE-2021-40085"
}
],
"related": [
"USN-6067-1"
],
"schema_version": "1.7.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
],
"upstream": [
"CVE-2021-40085"
]
}
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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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