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CVE-2021-3975

6.5 · MEDIUM

A use-after-free flaw was found in libvirt.

Published Aug 23, 2022CWE-416EPSS 1.64%

Overview

CVE-2021-3975 is a medium-severity vulnerability. It was published on August 23, 2022 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 can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical description

A use-after-free flaw was found in libvirt. The qemuMonitorUnregister() function in qemuProcessHandleMonitorEOF is called using multiple threads without being adequately protected by a monitor lock. This flaw could be triggered by the virConnectGetAllDomainStats API when the guest is shutting down. An unprivileged client with a read-only connection could use this flaw to perform a denial of service attack by causing the libvirt daemon to crash.

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

Refaccess.redhat.com/security/cve/CVE-2021-3975Refbugzilla.redhat.com/show_bug.cgi?id=2024326GitHubgithub.com/libvirt/libvirt/commit/1ac703a7d0789e46833f4013a3876c2e3af18ec7Reflists.debian.org/debian-lts-announce/2024/04/msg00000.htmlRefsecurity.netapp.com/advisory/ntap-20221201-0002/Refubuntu.com/security/CVE-2021-3975Refaccess.redhat.com/security/cve/CVE-2021-3975Refbugzilla.redhat.com/show_bug.cgi?id=2024326GitHubgithub.com/libvirt/libvirt/commit/1ac703a7d0789e46833f4013a3876c2e3af18ec7Reflists.debian.org/debian-lts-announce/2024/04/msg00000.html

How CyberStrike helps

Frequently asked questions

What is CVE-2021-3975?

CVE-2021-3975 is a medium-severity vulnerability. It was published on August 23, 2022 and has a CVSS 3.1 base score of 6.5 (MEDIUM).

How severe is CVE-2021-3975?

This vulnerability has a CVSS 3.1 base score of 6.5, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2021-3975?

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-2021-3975?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-3975 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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