CVE-2024-26223Network attack vector

Remote code execution via use-after-free

Published Apr 9, 2024 · Updated May 3, 2025

Use-after-free in Windows DNS Server on affected Windows Server builds allows remote authenticated users to execute code through the network. Microsoft identifies a use-after-free in the DNS Server component but has not disclosed the freed object, triggering request, or invalid reuse operation. Exploitation requires high privileges and the DNS Server role to be installed; successful exploitation grants code execution on the server.

CVSS severity7.2
High
EPSS probability1.56%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in Windows DNS Server on affected Windows Server builds allows remote authenticated users to execute code through the network. Microsoft identifies a use-after-free in the DNS Server component but has not disclosed the freed object, triggering request, or invalid reuse operation. Exploitation requires high privileges and the DNS Server role to be installed; successful exploitation grants code execution on the server.

The record

CVE
CVE-2024-26223
Published
Apr 9, 2024
Updated
May 3, 2025
Vendor
Microsoft
Product
Windows Server 2019
Classifications
CWE-416
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Apr 9, 2024CVE publishedPublication date reported by the CVE source.
  2. May 3, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=10.0.17763.0 <10.0.17763.5696

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Microsoft · Windows Server 2019version=10.0.17763.0 <10.0.17763.5696
Microsoft · Windows Server 2016 (Server Core installation)version=10.0.14393.0 <10.0.14393.6897
Microsoft · Windows Server 2022, 23H2 Edition (Server Core installation)version=10.0.25398.0 <10.0.25398.830
Microsoft · Windows Server 2016version=10.0.14393.0 <10.0.14393.6897
Microsoft · Windows Server 2019 (Server Core installation)version=10.0.17763.0 <10.0.17763.5696
Microsoft · Windows Server 2022version=10.0.20348.0 <10.0.20348.2402

Published CVSS scores

7.2Microsoft CorporationCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
6.6NIST NVDCVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-416Use After Free

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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