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CVE-2021-3416

6.0 · MEDIUM

A potential stack overflow via infinite loop issue was found in various NIC emulators of QEMU in versions up to and including 5.2.0.

Published Mar 18, 2021CWE-835EPSS 0.46%

Overview

CVE-2021-3416 is a medium-severity vulnerability. It was published on March 18, 2021 and has a CVSS 3.1 base score of 6.0 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 6.0, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

A potential stack overflow via infinite loop issue was found in various NIC emulators of QEMU in versions up to and including 5.2.0. The issue occurs in loopback mode of a NIC wherein reentrant DMA checks get bypassed. A guest user/process may use this flaw to consume CPU cycles or 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

Refbugzilla.redhat.com/show_bug.cgi?id=1932827Reflists.debian.org/debian-lts-announce/2021/04/msg00009.htmlReflists.debian.org/debian-lts-announce/2022/09/msg00008.htmlRefsecurity.gentoo.org/glsa/202208-27Refsecurity.netapp.com/advisory/ntap-20210507-0002/Refwww.openwall.com/lists/oss-security/2021/02/26/1Refbugzilla.redhat.com/show_bug.cgi?id=1932827Reflists.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-2021-3416?

CVE-2021-3416 is a medium-severity vulnerability. It was published on March 18, 2021 and has a CVSS 3.1 base score of 6.0 (MEDIUM).

How severe is CVE-2021-3416?

This vulnerability has a CVSS 3.1 base score of 6.0, 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-2021-3416?

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-2021-3416?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-3416 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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