CVE-2021-4158
MEDIUMCVSS 6/10EPSS 0.38%
Last modified
CVE-2021-4158 is a medium-severity vulnerability rated 6/10 on the CVSS scale. A NULL pointer dereference issue was found in the ACPI code of QEMU. A malicious, privileged user within the guest could use this flaw to crash the QEMU process on the host, resulting in a denial of service condition.. EPSS estimates a 0.38% chance of exploitation in the next 30 days.
Description
A NULL pointer dereference issue was found in the ACPI code of QEMU. A malicious, privileged user within the guest could use this flaw to crash the QEMU process on the host, resulting in a denial of service condition.
Metrics
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:N/I:N/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Qemu | Qemu | >= 6.0.0, < 7.0.0 |
| Redhat | Enterprise Linux | 9.0 |
References
- https://access.redhat.com/security/cve/CVE-2021-4158Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2035002Issue Tracking, Patch, Third Party Advisory
- https://gitlab.com/qemu-project/qemu/-/commit/9bd6565ccee68f72d5012e24646e12a1c662827ePatch, Third Party Advisory
- https://gitlab.com/qemu-project/qemu/-/issues/770Exploit, Third Party Advisory
- https://www.mail-archive.com/qemu-devel%40nongnu.org/msg857944.htmlPatch, Third Party Advisory
- https://access.redhat.com/security/cve/CVE-2021-4158Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2035002Issue Tracking, Patch, Third Party Advisory
- https://gitlab.com/qemu-project/qemu/-/commit/9bd6565ccee68f72d5012e24646e12a1c662827ePatch, Third Party Advisory
- https://gitlab.com/qemu-project/qemu/-/issues/770Exploit, Third Party Advisory
- https://www.mail-archive.com/qemu-devel%40nongnu.org/msg857944.htmlPatch, Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2021-4158?
A NULL pointer dereference issue was found in the ACPI code of QEMU. A malicious, privileged user within the guest could use this flaw to crash the QEMU process on the host, resulting in a denial of service condition.
How severe is CVE-2021-4158?
CVE-2021-4158 has a CVSS score of 6/10 (MEDIUM severity). The EPSS model estimates a 0.38% probability of exploitation in the next 30 days.
How do I fix CVE-2021-4158?
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-2021-4158?
Run a free Strix scan to check your systems for this vulnerability.
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