What’s Vulnerable › Vulnerabilities

CVE-2021-4147

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2022-03-25 · updated 2026-06-17
• Weakness: CWE-667

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.

Affected products

• Fedoraproject Fedora: 35
• NetApp ONTAP Select Deploy administration utility: all versions
• libvirt: before 2.33.0 — fixed in 2.33.0

How to fix

Upgrade to a fixed version: libvirt 2.33.0. Check the vendor advisory for mitigations.

References

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

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