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Vulnerability record · CVE-2021-4147 · published 25 March 2022

CVE-2021-4147: Redhat libvirt vulnerability

Redhat · Libvirt

A flaw was found in the libvirt libxl driver. A malicious guest could continuously reboot itself and cause libvirtd on the host to deadlock or crash, resulting in a denial of service condition.

6.5 CVSS 3.1 Medium EPSS 0.24% · top 86.2% CWE-667 · CWE-667
6.5CVSS 3.1 base score, v2 4.9
0.24%EPSS exploitation probability, 30 days
NoNot in CISA KEV
3Affected product versions listed by NVD
6References
17 Jun 2026Last modified by NVD

Description

A flaw was found in the libvirt libxl driver. A malicious guest could continuously reboot itself and cause libvirtd on the host to deadlock or crash, resulting in a denial of service condition.

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

Affected products

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

References

LinkTags
https://bugzilla.redhat.com/show_bug.cgi?id=2034195 Issue TrackingPatchVendor Advisory
https://lists.debian.org/debian-lts-announce/2024/04/msg00000.html
https://security.netapp.com/advisory/ntap-20220513-0004/ Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2034195 Issue TrackingPatchVendor Advisory
https://lists.debian.org/debian-lts-announce/2024/04/msg00000.html
https://security.netapp.com/advisory/ntap-20220513-0004/ Third Party Advisory

Track CVE-2021-4147 inside VULONE

Watch it alongside the ransomware crews, C2 infrastructure and forum chatter that reference it, query it through the API and pull it into your SIEM over TAXII.

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2021-4147), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.