Vulnerability record · CVE-2021-3559 · published 24 May 2021

CVE-2021-3559: Redhat libvirt memory buffer overflow vulnerability

Redhat · Libvirt

A flaw was found in libvirt in the virConnectListAllNodeDevices API in versions before 7.0.0. It only affects hosts with a PCI device and driver that supports mediated devices (e.g., GRID driver). This flaw could be used by an unprivileged client with a read-only connection to crash the libvirt daemon by executing the 'nodedev-list' virsh command. The highest threat from this vulnerability is to system availability.

6.5 CVSS 3.1 Medium EPSS 1.0% · top 37.7% CWE-119 · Memory buffer overflow

6.5CVSS 3.1 base score, v2 4.0

1.0%EPSS exploitation probability, 30 days

NoNot in CISA KEV

2Affected product versions listed by NVD

4References

17 Jun 2026Last modified by NVD

Description

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

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

NOntap Select Deploy Administration Utility Netapp

Libvirt Redhat

References

Link	Tags
https://bugzilla.redhat.com/show_bug.cgi?id=1962306	Issue TrackingPatchVendor Advisory
https://security.netapp.com/advisory/ntap-20210706-0006/	Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1962306	Issue TrackingPatchVendor Advisory
https://security.netapp.com/advisory/ntap-20210706-0006/	Third Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2021-3559), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.