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NVD / CVE Program· CNA redhat

CVE-2020-14339: A flaw was found in libvirt, where it leaked a file descriptor for `/dev/mapper/control` into the QEMU process.

Noroxi assessment

Priority: Monitor (action score 35/100)

  • 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: 0.42% (FIRST EPSS).
  • Someone with local access to the system 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) 1.3.18-20.module_el8.3.0+2048+e7a0a3ea; hivex-devel (AlmaLinux:8) 1.3.18-20.module_el8.3.0+2048+e7a0a3ea; libguestfs-winsupport (AlmaLinux:8) 8.2-1.module_el8.5.0+2608+72063365, 8.2-1.module_el8.3.0+2048+e7a0a3ea.
  • Mentioned 2 times in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to hivex (AlmaLinux:8) 1.3.18-20.module_el8.3.0+2048+e7a0a3ea; hivex-devel (AlmaLinux:8) 1.3.18-20.module_el8.3.0+2048+e7a0a3ea; libguestfs-winsupport (AlmaLinux:8) 8.2-1.module_el8.5.0+2608+72063365, 8.2-1.module_el8.3.0+2048+e7a0a3ea 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

A flaw was found in libvirt, where it leaked a file descriptor for `/dev/mapper/control` into the QEMU process. This file descriptor allows for privileged operations to happen against the device-mapper on the host. This flaw allows a malicious guest user or process to perform operations outside of their standard permissions, potentially causing serious damage to the host operating system. The highest threat from this vulnerability is to confidentiality, integrity, as well as system availability.

HighCVSS 8.8 · v3.1—No exploit Fix available
Published
Dec 3, 2020
Updated
Jun 16, 2026
EPSS
0.4% · 36th percentile

Report tools

JSON

Action score

35

Monitor

Low priority for now.

CVSS
35 / 40 · 8.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.4%

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  • Not in KEV: no record of exploitation in the wild
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  • A fix has been released

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Noroxi analysis

What does it mean in your environment?

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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

Affected versions

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

  • redhat enterprise linux8.0
  • redhat libvirt6.2.0 and later · before 6.7.0

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

    • libvirt 6.6.0affected

Package-level exposure

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

EcosystemPackageAffected rangeFix
AlmaLinux:8hivexbefore 1.3.18-20.module_el8.3.0+2048+e7a0a3ea1.3.18-20.module_el8.3.0+2048+e7a0a3ea
AlmaLinux:8hivex-develbefore 1.3.18-20.module_el8.3.0+2048+e7a0a3ea1.3.18-20.module_el8.3.0+2048+e7a0a3ea
AlmaLinux:8libguestfs-winsupportbefore 8.2-1.module_el8.5.0+2608+720633658.2-1.module_el8.5.0+2608+72063365
AlmaLinux:8libguestfs-winsupportbefore 8.2-1.module_el8.3.0+2048+e7a0a3ea8.2-1.module_el8.3.0+2048+e7a0a3ea
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:8libiscsibefore 1.18.0-8.module_el8.3.0+2048+e7a0a3ea1.18.0-8.module_el8.3.0+2048+e7a0a3ea
AlmaLinux:8libiscsi-develbefore 1.18.0-8.module_el8.3.0+2048+e7a0a3ea1.18.0-8.module_el8.3.0+2048+e7a0a3ea
AlmaLinux:8libiscsi-develbefore 1.18.0-8.module_el8.5.0+2608+720633651.18.0-8.module_el8.5.0+2608+72063365
AlmaLinux:8libiscsi-develbefore 1.18.0-8.module_el8.6.0+2880+7d9e37031.18.0-8.module_el8.6.0+2880+7d9e3703
AlmaLinux:8libiscsi-utilsbefore 1.18.0-8.module_el8.3.0+2048+e7a0a3ea1.18.0-8.module_el8.3.0+2048+e7a0a3ea
AlmaLinux:8libiscsi-utilsbefore 1.18.0-8.module_el8.6.0+2880+7d9e37031.18.0-8.module_el8.6.0+2880+7d9e3703
AlmaLinux:8libiscsi-utilsbefore 1.18.0-8.module_el8.5.0+2608+720633651.18.0-8.module_el8.5.0+2608+72063365
AlmaLinux:8libnbdbefore 1.2.2-1.module_el8.5.0+2608+720633651.2.2-1.module_el8.5.0+2608+72063365
AlmaLinux:8libnbdbefore 1.2.2-1.module_el8.3.0+2048+e7a0a3ea1.2.2-1.module_el8.3.0+2048+e7a0a3ea
AlmaLinux:8libnbd-develbefore 1.2.2-1.module_el8.5.0+2608+720633651.2.2-1.module_el8.5.0+2608+72063365
AlmaLinux:8libnbd-develbefore 1.2.2-1.module_el8.3.0+2048+e7a0a3ea1.2.2-1.module_el8.3.0+2048+e7a0a3ea
AlmaLinux:8libvirtbefore 6.0.0-28.module_el8.3.0+2048+e7a0a3ea6.0.0-28.module_el8.3.0+2048+e7a0a3ea
AlmaLinux:8libvirt-adminbefore 6.0.0-28.module_el8.3.0+2048+e7a0a3ea6.0.0-28.module_el8.3.0+2048+e7a0a3ea
AlmaLinux:8libvirt-bash-completionbefore 6.0.0-28.module_el8.3.0+2048+e7a0a3ea6.0.0-28.module_el8.3.0+2048+e7a0a3ea
AlmaLinux:8libvirt-clientbefore 6.0.0-28.module_el8.3.0+2048+e7a0a3ea6.0.0-28.module_el8.3.0+2048+e7a0a3ea
AlmaLinux:8libvirt-daemonbefore 6.0.0-28.module_el8.3.0+2048+e7a0a3ea6.0.0-28.module_el8.3.0+2048+e7a0a3ea
AlmaLinux:8libvirt-daemon-config-networkbefore 6.0.0-28.module_el8.3.0+2048+e7a0a3ea6.0.0-28.module_el8.3.0+2048+e7a0a3ea
AlmaLinux:8libvirt-daemon-config-nwfilterbefore 6.0.0-28.module_el8.3.0+2048+e7a0a3ea6.0.0-28.module_el8.3.0+2048+e7a0a3ea

+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-2019-10132A vulnerability was found in libvirt >= 4.1.0 in the virtlockd-admin.socket and virtlogd-admin.socket systemd units.
    35Monitor
  • CVE-2013-4401The virConnectDomainXMLToNative API function in libvirt 1.1.0 through 1.1.3 checks for the connect:read permission instead of the connect:wr
    35Monitor

Published before and after this one in the same product

  • ← EarlierCVE-2020-10703Jun 2, 2020 · A NULL pointer dereference was found in the libvirt API responsible introduced in upstream version 3.10.0, and fixed in libvirt 6.0.0, for f
    27Monitor
  • ← EarlierCVE-2020-25637Oct 6, 2020 · A double free memory issue was found to occur in the libvirt API, in versions before 6.8.0, responsible for requesting information about net
    26Monitor
  • Later →CVE-2021-3559May 24, 2021 · A flaw was found in libvirt in the virConnectListAllNodeDevices API in versions before 7.0.0.
    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:hivex1.3.18-20.module_el8.3.0+2048+e7a0a3ea · AlmaLinux:8Package registry (OSV)
almalinux:hivex-devel1.3.18-20.module_el8.3.0+2048+e7a0a3ea · AlmaLinux:8Package registry (OSV)
almalinux:libguestfs-winsupport8.2-1.module_el8.5.0+2608+72063365 · AlmaLinux:8Package registry (OSV)
almalinux:libiscsi1.18.0-8.module_el8.6.0+2880+7d9e3703 · AlmaLinux:8Package registry (OSV)
almalinux:libiscsi-devel1.18.0-8.module_el8.6.0+2880+7d9e3703 · AlmaLinux:8Package registry (OSV)
almalinux:libiscsi-utils1.18.0-8.module_el8.3.0+2048+e7a0a3ea · AlmaLinux:8Package registry (OSV)
almalinux:libnbd1.2.2-1.module_el8.5.0+2608+72063365 · AlmaLinux:8Package registry (OSV)
almalinux:libnbd-devel1.2.2-1.module_el8.3.0+2048+e7a0a3ea · AlmaLinux:8Package registry (OSV)
almalinux:libvirt6.0.0-28.module_el8.3.0+2048+e7a0a3ea · AlmaLinux:8Package registry (OSV)
almalinux:libvirt-admin6.0.0-28.module_el8.3.0+2048+e7a0a3ea · AlmaLinux:8Package registry (OSV)
almalinux:libvirt-bash-completion6.0.0-28.module_el8.3.0+2048+e7a0a3ea · AlmaLinux:8Package registry (OSV)
almalinux:libvirt-client6.0.0-28.module_el8.3.0+2048+e7a0a3ea · AlmaLinux:8Package registry (OSV)
alpine:libvirt6.6.0-r0 · Alpine:v3.12Package registry (OSV)
debian:libvirt6.6.0-1 · Debian:12Package registry (OSV)
opensuse:libvirt6.0.0-lp152.9.3.1 · openSUSE:Leap 15.2Package registry (OSV)
red hat:hivex0:1.3.18-20.module+el8.2.0+5588+63a201c3 · Red Hat:advanced_virtualization:8.2::el8Package registry (OSV)
red hat:hivex-debuginfo0:1.3.18-20.module+el8.2.0+5588+63a201c3 · Red Hat:advanced_virtualization:8.2::el8Package registry (OSV)
red hat:hivex-debugsource0:1.3.18-20.module+el8.2.0+5588+63a201c3 · Red Hat:advanced_virtualization:8.2::el8Package registry (OSV)
red hat:hivex-devel0:1.3.18-20.module+el8.2.0+5588+63a201c3 · Red Hat:advanced_virtualization:8.2::el8Package registry (OSV)
red hat:libguestfs1:1.40.2-24.module+el8.2.1+7154+47ffd890 · Red Hat:advanced_virtualization:8.2::el8Package registry (OSV)
red hat:libguestfs-bash-completion1:1.40.2-24.module+el8.2.1+7154+47ffd890 · Red Hat:advanced_virtualization:8.2::el8Package registry (OSV)
red hat:libguestfs-benchmarking1:1.40.2-24.module+el8.2.1+7154+47ffd890 · Red Hat:advanced_virtualization:8.2::el8Package registry (OSV)
red hat:libguestfs-benchmarking-debuginfo1:1.40.2-24.module+el8.2.1+7154+47ffd890 · Red Hat:advanced_virtualization:8.2::el8Package registry (OSV)
red hat:libguestfs-debuginfo1:1.40.2-24.module+el8.2.1+7154+47ffd890 · Red Hat:advanced_virtualization:8.2::el8Package registry (OSV)
red hat:libguestfs-debugsource1:1.40.2-24.module+el8.2.1+7154+47ffd890 · Red Hat:advanced_virtualization:8.2::el8Package registry (OSV)
red hat:libguestfs-devel1:1.40.2-24.module+el8.2.1+7154+47ffd890 · Red Hat:advanced_virtualization:8.2::el8Package registry (OSV)
red hat:SLOF0:20191022-3.git899d9883.module+el8.2.0+5449+efc036dd · Red Hat:advanced_virtualization:8.2::el8Package registry (OSV)
rocky linux:hivex0:1.3.18-20.module+el8.4.0+534+4680a14e · 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)

+10

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.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

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

No commit or PR link among the references.

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).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

Technical details

Attack conditions

  • Someone with local access to the system 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
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted

Impact can extend beyond the vulnerable component (scope changes).

Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Changed
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-772 · Missing Release of Resource after Effective Lifetime

CVSS vector

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

Attack patterns (CAPEC)

Change log

  1. Fix✗ → ✓

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

References

Show all references (2 more)

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

All records