CVE-2021-38598

mediumpriority · track · 36OT risk · elevatedEPSS 0.012 · 69 %ileEUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

1.22% (69th) EPSS

CVSS 5.8 · medium

Is it mine?

8 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · osv · nvd

EPSS · scored 2026-10-27

OpenStack Neutron before 16.4.1, 17.x before 17.1.3, and 18.0.0 allows hardware address impersonation when the linuxbridge driver with ebtables-nft is used on a Netfilter-based platform. By sending carefully crafted packets, anyone in control of a server instance connected to the virtual switch can impersonate the hardware addresses of other systems on the network, resulting in denial of service or in some cases possibly interception of traffic intended for other destinations.

cvss

Technical severity, 0–10. One row per scoring source.

9.1

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–critical · 5.8–9.1

v2.05.8mediumAV:N/AC:M/Au:N/C:N/I:P/A:Pprimary · NVD / NIST USexploitability 8.6 · impact 4.9

v3.19.1criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:Hprimary · NVD / NIST USexploitability 3.9 · impact 5.2

v3.19.1criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:Hsecondary · OSV

v3.18.3highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H/E:Usecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-290USprimaryCWE-863US

affected products (8)

Products and version ranges known to be affected.

n/a n/a≤ n/aenisa_euvdEU
openstack neutron< 16.4.1nvdUScpe:2.3:a:openstack:neutron:*:*:*:*:*:*:*:*
openstack neutron17.0.0 → 17.1.3nvdUScpe:2.3:a:openstack:neutron:*:*:*:*:*:*:*:*
openstack neutron= 18.0.0nvdUScpe:2.3:a:openstack:neutron:*:*:*:*:*:*:*:*
PyPI neutronall versionsosvUSpkg:pypi/neutron
PyPI neutron< 16.4.1osvUSpkg:pypi/neutron
PyPI neutron17.0.0 → 17.1.3osvUSpkg:pypi/neutron
PyPI neutron18.0.0 → 18.1.0osvUSpkg:pypi/neutron

advisories (2)

Vendor and ecosystem advisories describing this.

GHSA-hvm4-mc7m-22w4OpenStack Neutron vulnerable to hardware address impersonation2022-05-24ghsa · osvUS
OpenStack Neutron before 16.4.1, 17.x before 17.1.3, and 18.0.0 allows hardware address impersonation when the linuxbridge driver with ebtables-nft is used on a Netfilter-based platform. By sending carefully crafted packets, anyone in control of a server instance connected to the virtual switch can impersonate the hardware addresses of other systems on the network, resulting in denial of service or in some cases possibly interception of traffic intended for other destinations.
PYSEC-2021-3602021-08-23vendor · osvUS
OpenStack Neutron before 16.4.1, 17.x before 17.1.3, and 18.0.0 allows hardware address impersonation when the linuxbridge driver with ebtables-nft is used on a Netfilter-based platform. By sending carefully crafted packets, anyone in control of a server instance connected to the virtual switch can impersonate the hardware addresses of other systems on the network, resulting in denial of service or in some cases possibly interception of traffic intended for other destinations.

also known as (6)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd osv nvd NVD CVE.org MITRE

published 2021-08-23modified 2026-06-17

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+891 more

references (6)

External citations — patches, advisories, analysis.

https://access.redhat.com/security/cve/cve-2021-38598 cnnvd
https://launchpad.net/bugs/1938670 cnnvd
https://www.auscert.org.au/bulletins/ESB-2023.2645 cnnvd
https://www.cybersecurity-help.cz/vdb/SB2021101209 cnnvd
https://launchpad.net/bugs/1938670 enisa_euvd
https://launchpad.net/bugs/1938670ExploitIssue TrackingThird Party Advisorynvd

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