CVE-2021-38598

Name: CVE-2021-38598
Creator: NVD / NIST
Published: 2021-08-23T05:15:08.193+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.1/10EPSS 1.21%

Last modified Jun 17, 2026

CVE-2021-38598 is a critical-severity vulnerability rated 9.1/10 on the CVSS scale. 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.. EPSS estimates a 1.21% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1

9.1/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

EPSS Probability

1.21%

64.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-290

Affected Software

Vendor	Product	Versions
Openstack	Neutron	< 16.4.1
Openstack	Neutron	>= 17.0.0, < 17.1.3
Openstack	Neutron	18.0.0

References

https://launchpad.net/bugs/1938670Exploit, Issue Tracking, Third Party Advisory
https://launchpad.net/bugs/1938670Exploit, Issue Tracking, Third Party Advisory

Timeline

Published: Aug 23, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-38598?

How severe is CVE-2021-38598?

CVE-2021-38598 has a CVSS score of 9.1/10 (CRITICAL severity). The EPSS model estimates a 1.21% probability of exploitation in the next 30 days.

How do I fix CVE-2021-38598?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-38598?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST