CVE-2020-12430Network attack vector

Denial of service via leaked IOThread stats array

Published Apr 28, 2020 · Updated Aug 4, 2024

libvirt 4.10.0 through 6.x before 6.1.0 allows remote authenticated users with read-only connections to cause denial of service via domstats. The qemuDomainGetStatsIOThread function returns a NULL-terminated IOThread statistics array when no IOThreads exist, but neither it nor its caller frees the allocation, leaking memory on repeated virDomainListGetStats requests. Exploitation requires a libvirt read-only connection and can exhaust daemon memory, interrupting service without providing confidentiality or integrity impact.

CVSS severity6.5
Medium
EPSS probability2.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

libvirt 4.10.0 through 6.x before 6.1.0 allows remote authenticated users with read-only connections to cause denial of service via domstats. The qemuDomainGetStatsIOThread function returns a NULL-terminated IOThread statistics array when no IOThreads exist, but neither it nor its caller frees the allocation, leaking memory on repeated virDomainListGetStats requests. Exploitation requires a libvirt read-only connection and can exhaust daemon memory, interrupting service without providing confidentiality or integrity impact.

The record

CVE
CVE-2020-12430
Published
Apr 28, 2020
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-401, T1499
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 28, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.5NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
4.0NVDAV:N/AC:L/Au:S/C:N/I:N/A:P

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-401Missing Release of Memory after Effective Lifetime
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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