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CVE-2021-4207

8.2 · HIGH

A flaw was found in the QXL display device emulation in QEMU.

Published Apr 29, 2022CWE-362EPSS 0.40%

Overview

CVE-2021-4207 is a high-severity vulnerability. It was published on April 29, 2022 and has a CVSS 3.1 base score of 8.2 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.2, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

A flaw was found in the QXL display device emulation in QEMU. A double fetch of guest controlled values `cursor->header.width` and `cursor->header.height` can lead to the allocation of a small cursor object followed by a subsequent heap-based buffer overflow. A malicious privileged guest user could use this flaw to crash the QEMU process on the host or potentially execute arbitrary code within the context of the QEMU process.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refbugzilla.redhat.com/show_bug.cgi?id=2036966Reflists.debian.org/debian-lts-announce/2022/09/msg00008.htmlRefsecurity.gentoo.org/glsa/202208-27Refstarlabs.sg/advisories/21-4207/Refwww.debian.org/security/2022/dsa-5133Refbugzilla.redhat.com/show_bug.cgi?id=2036966Reflists.debian.org/debian-lts-announce/2022/09/msg00008.htmlRefsecurity.gentoo.org/glsa/202208-27Refsecurity.netapp.com/advisory/ntap-20250321-0009/Refstarlabs.sg/advisories/21-4207/

How CyberStrike helps

Frequently asked questions

What is CVE-2021-4207?

CVE-2021-4207 is a high-severity vulnerability. It was published on April 29, 2022 and has a CVSS 3.1 base score of 8.2 (HIGH).

How severe is CVE-2021-4207?

This vulnerability has a CVSS 3.1 base score of 8.2, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2021-4207?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2021-4207?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-4207 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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