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CVE-2021-20203

3.2 · LOW

An integer overflow issue was found in the vmxnet3 NIC emulator of the QEMU for versions up to v5.2.0.

Published Feb 25, 2021CWE-190EPSS 0.59%

Overview

CVE-2021-20203 is a low-severity vulnerability. It was published on February 25, 2021 and has a CVSS 3.1 base score of 3.2 (LOW).

This vulnerability has a CVSS 3.1 base score of 3.2, rated LOW. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

An integer overflow issue was found in the vmxnet3 NIC emulator of the QEMU for versions up to v5.2.0. It may occur if a guest was to supply invalid values for rx/tx queue size or other NIC parameters. A privileged guest user may use this flaw to crash the QEMU process on the host resulting in DoS scenario.

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

Refbugs.launchpad.net/qemu/+bug/1913873Refbugzilla.redhat.com/show_bug.cgi?id=1922441Reflists.debian.org/debian-lts-announce/2021/04/msg00009.htmlReflists.debian.org/debian-lts-announce/2022/09/msg00008.htmlRefsecurity.gentoo.org/glsa/202208-27Refbugs.launchpad.net/qemu/+bug/1913873Refbugzilla.redhat.com/show_bug.cgi?id=1922441Reflists.debian.org/debian-lts-announce/2021/04/msg00009.htmlReflists.debian.org/debian-lts-announce/2022/09/msg00008.htmlRefsecurity.gentoo.org/glsa/202208-27

How CyberStrike helps

Frequently asked questions

What is CVE-2021-20203?

CVE-2021-20203 is a low-severity vulnerability. It was published on February 25, 2021 and has a CVSS 3.1 base score of 3.2 (LOW).

How severe is CVE-2021-20203?

This vulnerability has a CVSS 3.1 base score of 3.2, rated LOW. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2021-20203?

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-2021-20203?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-20203 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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