CVE-2021-3667

Name: CVE-2021-3667
Creator: NVD / NIST
Published: 2022-03-02T23:15:08.843+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 1.33%

Last modified Jun 17, 2026

CVE-2021-3667 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. An improper locking issue was found in the virStoragePoolLookupByTargetPath API of libvirt. It occurs in the storagePoolLookupByTargetPath function where a locked virStoragePoolObj object is not properly released on ACL permission failure. EPSS estimates a 1.33% chance of exploitation in the next 30 days.

Description

An improper locking issue was found in the virStoragePoolLookupByTargetPath API of libvirt. It occurs in the storagePoolLookupByTargetPath function where a locked virStoragePoolObj object is not properly released on ACL permission failure. Clients connecting to the read-write socket with limited ACL permissions could use this flaw to acquire the lock and prevent other users from accessing storage pool/volume APIs, resulting in a denial of service condition. The highest threat from this vulnerability is to system availability.

Metrics

CVSS 3.1

6.5/10

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS Probability

1.33%

67.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Redhat	Libvirt	>= 4.1.0, <= 7.5.0
Redhat	Enterprise Linux	8.0
Netapp	Ontap Select Deploy Administration Utility	All versions
Debian	Debian Linux	10.0

References

https://bugzilla.redhat.com/show_bug.cgi?id=1986094Issue Tracking, Vendor Advisory
https://gitlab.com/libvirt/libvirt/-/commit/447f69dec47e1b0bd15ecd7cd49a9fd3b050fb87Patch, Third Party Advisory
https://libvirt.org/git/?p=libvirt.git%3Ba=commit%3Bh=447f69dec47e1b0bd15ecd7cd49a9fd3b050fb87Patch
https://lists.debian.org/debian-lts-announce/2024/04/msg00000.htmlMailing List, Third Party Advisory
https://security.gentoo.org/glsa/202210-06Third Party Advisory
https://security.netapp.com/advisory/ntap-20220331-0005/Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1986094Issue Tracking, Vendor Advisory
https://gitlab.com/libvirt/libvirt/-/commit/447f69dec47e1b0bd15ecd7cd49a9fd3b050fb87Patch, Third Party Advisory
https://libvirt.org/git/?p=libvirt.git%3Ba=commit%3Bh=447f69dec47e1b0bd15ecd7cd49a9fd3b050fb87Patch
https://lists.debian.org/debian-lts-announce/2024/04/msg00000.htmlMailing List, Third Party Advisory
https://security.gentoo.org/glsa/202210-06Third Party Advisory
https://security.netapp.com/advisory/ntap-20220331-0005/Third Party Advisory

Timeline

Published: Mar 2, 2022
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2021-3667?

How severe is CVE-2021-3667?

CVE-2021-3667 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 1.33% probability of exploitation in the next 30 days.

How do I fix CVE-2021-3667?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-3667?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST