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CVE-2021-20196

6.5 · MEDIUM

A NULL pointer dereference flaw was found in the floppy disk emulator of QEMU.

Published May 26, 2021CWE-476EPSS 0.48%

Overview

CVE-2021-20196 is a medium-severity vulnerability. It was published on May 26, 2021 and has a CVSS 3.1 base score of 6.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 6.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

A NULL pointer dereference flaw was found in the floppy disk emulator of QEMU. This issue occurs while processing read/write ioport commands if the selected floppy drive is not initialized with a block device. This flaw allows a privileged guest user to crash the QEMU process on the host, resulting in a denial of service. The highest threat from this vulnerability is to system availability.

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/1912780Reflists.debian.org/debian-lts-announce/2022/04/msg00002.htmlReflists.debian.org/debian-lts-announce/2022/09/msg00008.htmlRefsecurity.netapp.com/advisory/ntap-20210708-0004/Refwww.openwall.com/lists/oss-security/2021/01/28/1Refbugs.launchpad.net/qemu/+bug/1912780Reflists.debian.org/debian-lts-announce/2022/04/msg00002.htmlReflists.debian.org/debian-lts-announce/2022/09/msg00008.htmlRefsecurity.netapp.com/advisory/ntap-20210708-0004/Refwww.openwall.com/lists/oss-security/2021/01/28/1

How CyberStrike helps

Frequently asked questions

What is CVE-2021-20196?

CVE-2021-20196 is a medium-severity vulnerability. It was published on May 26, 2021 and has a CVSS 3.1 base score of 6.5 (MEDIUM).

How severe is CVE-2021-20196?

This vulnerability has a CVSS 3.1 base score of 6.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2021-20196?

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-2021-20196?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-20196 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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