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NVD / CVE Program· CNA redhat

CVE-2021-3667: An improper locking issue was found in the virStoragePoolLookupByTargetPath API of libvirt.

Noroxi assessment

Priority: Monitor (action score 26/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 1.3% (FIRST EPSS); higher than 71.8% of all records.
  • Anyone who can reach it over the internet can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: hivex (AlmaLinux:8) 1.3.18-21.module_el8.5.0+2608+72063365; hivex-devel (AlmaLinux:8) 1.3.18-21.module_el8.5.0+2608+72063365; libguestfs (AlmaLinux:8) 1:1.40.2-28.module_el8.5.0+2608+72063365.alma.

Low priority for now. Upgrade to hivex (AlmaLinux:8) 1.3.18-21.module_el8.5.0+2608+72063365; hivex-devel (AlmaLinux:8) 1.3.18-21.module_el8.5.0+2608+72063365; libguestfs (AlmaLinux:8) 1:1.40.2-28.module_el8.5.0+2608+72063365.alma or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

MediumCVSS 6.5 · v3.1—No exploit Fix available
Published
Mar 2, 2022
Updated
Jun 17, 2026
EPSS
1.3% · 71th percentile

Report tools

JSON

Action score

26

Monitor

Low priority for now.

CVSS
26 / 40 · 6.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 1.3%

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  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
redhatlibvirt
redhatenterprise linux
netappontap select deploy administration utility
debiandebian linux

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • debian debian linux10.0
  • netapp ontap select deploy administration utilityall versions
  • redhat enterprise linux8.0
  • redhat libvirt4.1.0 and later · up to 7.5.0 inclusive

Versions reported by the vendor

Affected version ranges reported by the assigning authority (redhat). Independent of NVD's CPE analysis and usually ahead of it.

  • n/a libvirt

    • Fixedin - libvert v7.6.0-rc1 and aboveaffected

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
AlmaLinux:8hivexbefore 1.3.18-21.module_el8.5.0+2608+720633651.3.18-21.module_el8.5.0+2608+72063365
AlmaLinux:8hivex-develbefore 1.3.18-21.module_el8.5.0+2608+720633651.3.18-21.module_el8.5.0+2608+72063365
AlmaLinux:8libguestfsbefore 1:1.40.2-28.module_el8.5.0+2608+72063365.alma1:1.40.2-28.module_el8.5.0+2608+72063365.alma
AlmaLinux:8libguestfs-bash-completionbefore 1:1.40.2-28.module_el8.5.0+2608+72063365.alma1:1.40.2-28.module_el8.5.0+2608+72063365.alma
AlmaLinux:8libguestfs-benchmarkingbefore 1:1.40.2-28.module_el8.5.0+2608+72063365.alma1:1.40.2-28.module_el8.5.0+2608+72063365.alma
AlmaLinux:8libguestfs-develbefore 1:1.40.2-28.module_el8.5.0+2608+72063365.alma1:1.40.2-28.module_el8.5.0+2608+72063365.alma
AlmaLinux:8libguestfs-gfs2before 1:1.40.2-28.module_el8.5.0+2608+72063365.alma1:1.40.2-28.module_el8.5.0+2608+72063365.alma
AlmaLinux:8libguestfs-gobjectbefore 1:1.40.2-28.module_el8.5.0+2608+72063365.alma1:1.40.2-28.module_el8.5.0+2608+72063365.alma
AlmaLinux:8libguestfs-gobject-develbefore 1:1.40.2-28.module_el8.5.0+2608+72063365.alma1:1.40.2-28.module_el8.5.0+2608+72063365.alma
AlmaLinux:8libguestfs-inspect-iconsbefore 1:1.40.2-28.module_el8.5.0+2608+72063365.alma1:1.40.2-28.module_el8.5.0+2608+72063365.alma
AlmaLinux:8libguestfs-javabefore 1:1.40.2-28.module_el8.5.0+2608+72063365.alma1:1.40.2-28.module_el8.5.0+2608+72063365.alma
AlmaLinux:8libguestfs-java-develbefore 1:1.40.2-28.module_el8.5.0+2608+72063365.alma1:1.40.2-28.module_el8.5.0+2608+72063365.alma
AlmaLinux:8libguestfs-javadocbefore 1:1.40.2-28.module_el8.5.0+2608+72063365.alma1:1.40.2-28.module_el8.5.0+2608+72063365.alma
AlmaLinux:8libguestfs-man-pages-jabefore 1:1.40.2-28.module_el8.5.0+2608+72063365.alma1:1.40.2-28.module_el8.5.0+2608+72063365.alma
AlmaLinux:8libguestfs-man-pages-ukbefore 1:1.40.2-28.module_el8.5.0+2608+72063365.alma1:1.40.2-28.module_el8.5.0+2608+72063365.alma
AlmaLinux:8libguestfs-rescuebefore 1:1.40.2-28.module_el8.5.0+2608+72063365.alma1:1.40.2-28.module_el8.5.0+2608+72063365.alma
AlmaLinux:8libguestfs-rsyncbefore 1:1.40.2-28.module_el8.5.0+2608+72063365.alma1:1.40.2-28.module_el8.5.0+2608+72063365.alma
AlmaLinux:8libguestfs-toolsbefore 1:1.40.2-28.module_el8.5.0+2608+72063365.alma1:1.40.2-28.module_el8.5.0+2608+72063365.alma
AlmaLinux:8libguestfs-tools-cbefore 1:1.40.2-28.module_el8.5.0+2608+72063365.alma1:1.40.2-28.module_el8.5.0+2608+72063365.alma
AlmaLinux:8libguestfs-winsupportbefore 8.2-1.module_el8.5.0+2608+720633658.2-1.module_el8.5.0+2608+72063365
AlmaLinux:8libguestfs-xfsbefore 1:1.40.2-28.module_el8.5.0+2608+72063365.alma1:1.40.2-28.module_el8.5.0+2608+72063365.alma
AlmaLinux:8libiscsibefore 1.18.0-8.module_el8.5.0+2608+720633651.18.0-8.module_el8.5.0+2608+72063365
AlmaLinux:8libiscsibefore 1.18.0-8.module_el8.6.0+2880+7d9e37031.18.0-8.module_el8.6.0+2880+7d9e3703
AlmaLinux:8libiscsi-develbefore 1.18.0-8.module_el8.5.0+2608+720633651.18.0-8.module_el8.5.0+2608+72063365

+96

Same product

redhat: all records

Other highest-scoring records for the same primary product.

  • CVE-2016-5008libvirt before 2.0.0 improperly disables password checking when the password on a VNC server is set to an empty string, which allows remote
    40Plan
  • CVE-2020-14339A flaw was found in libvirt, where it leaked a file descriptor for `/dev/mapper/control` into the QEMU process.
    35Monitor
  • CVE-2019-10132A vulnerability was found in libvirt >= 4.1.0 in the virtlockd-admin.socket and virtlogd-admin.socket systemd units.
    35Monitor

Published before and after this one in the same product

  • ← EarlierCVE-2020-14301May 27, 2021 · An information disclosure vulnerability was found in libvirt in versions before 6.3.0.
    26Monitor
  • ← EarlierCVE-2021-3631Mar 2, 2022 · A flaw was found in libvirt while it generates SELinux MCS category pairs for VMs' dynamic labels.
    25Monitor
  • Later →CVE-2021-4147Mar 25, 2022 · A flaw was found in the libvirt libxl driver.
    26Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
almalinux:hivex1.3.18-21.module_el8.5.0+2608+72063365 · AlmaLinux:8Package registry (OSV)
almalinux:hivex-devel1.3.18-21.module_el8.5.0+2608+72063365 · AlmaLinux:8Package registry (OSV)
almalinux:libguestfs1:1.40.2-28.module_el8.5.0+2608+72063365.alma · AlmaLinux:8Package registry (OSV)
almalinux:libguestfs-bash-completion1:1.40.2-28.module_el8.5.0+2608+72063365.alma · AlmaLinux:8Package registry (OSV)
almalinux:libguestfs-benchmarking1:1.40.2-28.module_el8.5.0+2608+72063365.alma · AlmaLinux:8Package registry (OSV)
almalinux:libguestfs-devel1:1.40.2-28.module_el8.5.0+2608+72063365.alma · AlmaLinux:8Package registry (OSV)
almalinux:libguestfs-gfs21:1.40.2-28.module_el8.5.0+2608+72063365.alma · AlmaLinux:8Package registry (OSV)
almalinux:libguestfs-gobject1:1.40.2-28.module_el8.5.0+2608+72063365.alma · AlmaLinux:8Package registry (OSV)
almalinux:libguestfs-gobject-devel1:1.40.2-28.module_el8.5.0+2608+72063365.alma · AlmaLinux:8Package registry (OSV)
almalinux:libguestfs-inspect-icons1:1.40.2-28.module_el8.5.0+2608+72063365.alma · AlmaLinux:8Package registry (OSV)
almalinux:libguestfs-java1:1.40.2-28.module_el8.5.0+2608+72063365.alma · AlmaLinux:8Package registry (OSV)
almalinux:libguestfs-java-devel1:1.40.2-28.module_el8.5.0+2608+72063365.alma · AlmaLinux:8Package registry (OSV)
debian:libvirt7.6.0-1 · Debian:12Package registry (OSV)
opensuse:libvirt6.0.0-lp152.9.15.1 · openSUSE:Leap 15.2Package registry (OSV)
red hat:hivex0:1.3.18-21.module+el8.4.0+11609+2eba841a · Red Hat:advanced_virtualization:8.4::el8Package registry (OSV)
red hat:hivex-debuginfo0:1.3.18-21.module+el8.4.0+11609+2eba841a · Red Hat:advanced_virtualization:8.4::el8Package registry (OSV)
red hat:hivex-debugsource0:1.3.18-21.module+el8.4.0+11609+2eba841a · Red Hat:advanced_virtualization:8.4::el8Package registry (OSV)
red hat:hivex-devel0:1.3.18-21.module+el8.4.0+11609+2eba841a · Red Hat:advanced_virtualization:8.4::el8Package registry (OSV)
red hat:libguestfs1:1.44.0-2.module+el8.4.0+10146+75917d2f · Red Hat:advanced_virtualization:8.4::el8Package registry (OSV)
red hat:libguestfs-bash-completion1:1.44.0-2.module+el8.4.0+10146+75917d2f · Red Hat:advanced_virtualization:8.4::el8Package registry (OSV)
red hat:libguestfs-debuginfo1:1.44.0-2.module+el8.4.0+10146+75917d2f · Red Hat:advanced_virtualization:8.4::el8Package registry (OSV)
red hat:libguestfs-debugsource1:1.44.0-2.module+el8.4.0+10146+75917d2f · Red Hat:advanced_virtualization:8.4::el8Package registry (OSV)
red hat:libguestfs-devel1:1.44.0-2.module+el8.4.0+10146+75917d2f · Red Hat:advanced_virtualization:8.4::el8Package registry (OSV)
red hat:libguestfs-gfs21:1.44.0-2.module+el8.4.0+10146+75917d2f · Red Hat:advanced_virtualization:8.4::el8Package registry (OSV)
red hat:libguestfs-gobject1:1.44.0-2.module+el8.4.0+10146+75917d2f · Red Hat:advanced_virtualization:8.4::el8Package registry (OSV)
red hat:SLOF0:20200717-1.gite18ddad8.module+el8.4.0+8855+a9e237a9 · Red Hat:advanced_virtualization:8.4::el8Package registry (OSV)
rocky linux:hivex0:1.3.18-21.module+el8.4.0+642+7e26f5e1 · Rocky Linux:8Package registry (OSV)
rocky linux:libguestfs1:1.40.2-28.module+el8.5.0+670+c4aa478c · Rocky Linux:8Package registry (OSV)
rocky linux:libguestfs-winsupport0:8.2-1.module+el8.4.0+534+4680a14e · Rocky Linux:8Package registry (OSV)
rocky linux:libiscsi0:1.18.0-8.module+el8.7.0+1084+97b81f61 · Rocky Linux:8Package registry (OSV)

+9

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

CWE-667 · Improper Locking

CVSS vector

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

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (5 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records