CVE-2021-4158

Name: CVE-2021-4158
Creator: NVD / NIST
Published: 2022-08-24T16:15:09.66+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6/10EPSS 0.38%

Last modified Jun 17, 2026

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

6/10

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

EPSS Probability

0.38%

29.6th percentile

Probability of exploitation in the next 30 days. Learn more

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: Aug 24, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-4158?

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.

Are you affected by CVE-2021-4158?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST