CVE-2021-4147
MEDIUMCVSS 6.5/10EPSS 0.23%
Last modified
CVE-2021-4147 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. 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.. EPSS estimates a 0.23% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Redhat | Libvirt | < 2.33.0 |
| Fedoraproject | Fedora | 35 |
| Netapp | Ontap Select Deploy Administration Utility | All versions |
References
- https://bugzilla.redhat.com/show_bug.cgi?id=2034195Issue Tracking, Patch, Vendor Advisory
- https://security.netapp.com/advisory/ntap-20220513-0004/Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2034195Issue Tracking, Patch, Vendor Advisory
- https://security.netapp.com/advisory/ntap-20220513-0004/Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2021-4147?
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.
How severe is CVE-2021-4147?
CVE-2021-4147 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 0.23% probability of exploitation in the next 30 days.
How do I fix CVE-2021-4147?
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.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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Are you affected by CVE-2021-4147?
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Scan your code nowSource: NVD / NIST