No exploitation reportedFix available

CVE-2021-3667

No exploitation reported by the sources we read.

Published2022-03-02
WeaknessCWE-667

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC

2022-03-0223:15CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2021-3667?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2021-3667?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Debian debian linux

Branch	Affected	Fixed in	Source
10.0	= 10.0	no fix published	NVD

Netapp ontap select deploy administration utility

Branch	Affected	Fixed in	Source
—	all versions	no fix published	NVD

Redhat enterprise linux

Branch	Affected	Fixed in	Source
8.0	= 8.0	no fix published	NVD

1 more product in the sources.

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

hivexAlmaLinux:8all versions · fixed in 1.3.18-21.module_el8.5.0+2608+72063365and 4 other packages
libguestfsAlmaLinux:8all versions · fixed in 1:1.40.2-28.module_el8.5.0+2608+72063365.almaand 23 other packages
libguestfs-winsupportAlmaLinux:8all versions · fixed in 8.2-1.module_el8.5.0+2608+72063365
libiscsiAlmaLinux:8all versions · fixed in 1.18.0-8.module_el8.5.0+2608+72063365and 2 other packages
libiscsiAlmaLinux:8all versions · fixed in 1.18.0-8.module_el8.6.0+2880+7d9e3703and 2 other packages
libnbdAlmaLinux:8all versions · fixed in 1.2.2-1.module_el8.5.0+2608+72063365and 3 other packages
libvirtAlmaLinux:8all versions · fixed in 6.0.0-37.module_el8.5.0+2608+72063365and 28 other packages
libvirt-dbusAlmaLinux:8all versions · fixed in 1.3.0-2.module_el8.5.0+2608+72063365

9 more package ranges on OSV.dev

Full record on NVD

Fix

Advisories and patches

bugzilla.redhat.comVendor Advisory
gitlab.comPatch
libvirt.orgPatch

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

NVDCVSS 3.16.5read 2026-10-23
NVDCVSS 2.03.5read 2026-10-23
CNAweakness (CWE)CWE-667read 2026-10-23
NVDweakness (CWE)CWE-667read 2026-10-23
FIRST EPSSEPSS score1.4 %2026-10-23
OSVaffected packages—

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Published: 2022-03-02
Last Modified: 2026-06-17
NVD status: Analyzed

Frequently asked questions

What is CVE-2021-3667?

Is CVE-2021-3667 actively exploited?

Active exploitation of CVE-2021-3667 has not been confirmed. Its EPSS score was 1.4% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-3667?

CVE-2021-3667 has a CVSS v3 base score of 6.5 (MEDIUM severity), with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

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