HOMEVULNERABILITIESCVE-2021-3667
MEDIUM

CVE-2021-3667

CWE-667Published: March 2, 2022· Updated: Jun 17, 2026

6.5
CVSS v3.1

Official 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.

NVD Source

Technical Analysis

CVE-2021-3667 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 6.5.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.Low
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected Vendors & Products

Debian1 product(s)
debian linux
netapp1 product(s)
ontap select deploy administration utility
Red Hat2 product(s)
libvirtenterprise linux
Source: NVD CPE · 4 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://gitlab.com/libvirt/libvirt/-/commit/447f69dec47e1b0bd15ecd7cd49a9fd3b050fb87
PATCHhttps://libvirt.org/git/?p=libvirt.git%3Ba=commit%3Bh=447f69dec47e1b0bd15ecd7cd49a9fd3b050fb87
PATCHhttps://gitlab.com/libvirt/libvirt/-/commit/447f69dec47e1b0bd15ecd7cd49a9fd3b050fb87
PATCHhttps://libvirt.org/git/?p=libvirt.git%3Ba=commit%3Bh=447f69dec47e1b0bd15ecd7cd49a9fd3b050fb87
ADVISORYhttps://bugzilla.redhat.com/show_bug.cgi?id=1986094
ADVISORYhttps://lists.debian.org/debian-lts-announce/2024/04/msg00000.html
ADVISORYhttps://security.gentoo.org/glsa/202210-06
ADVISORYhttps://security.netapp.com/advisory/ntap-20220331-0005/
ADVISORYhttps://bugzilla.redhat.com/show_bug.cgi?id=1986094
ADVISORYhttps://lists.debian.org/debian-lts-announce/2024/04/msg00000.html
ADVISORYhttps://security.gentoo.org/glsa/202210-06
ADVISORYhttps://security.netapp.com/advisory/ntap-20220331-0005/

All References (12)

→
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

Quick Facts

CVE IDCVE-2021-3667
CVSS Score6.5 / 10
SeverityMEDIUM
WeaknessCWE-667
CISA KEVNo
Affected3 vendor(s)
PublishedMar 2, 2022

Related CVEs (CWE-667)

CVE-2021-22530
9.9
CVE-2020-12658
9.8
CVE-2019-5886
9.8
CVE-2020-15674
8.8
CVE-2024-58087
8.1
CVE-2019-8829
7.8

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2021-3667 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWatch. CVE data is provided under the NVD usage policy.
← All Vulnerabilities·Search for CVE-2021-3667·NVD