Description
Use after free in Windows DNS allows an unauthorized attacker to execute code over a network.
Published: 2026-09-08
Score: 8.1 High
EPSS: < 1% Very Low
KEV: No
Impact: Remote Code Execution
Action: Immediate Patch
AI Analysis

Impact

This vulnerability is a use‑after‑free flaw in the Windows DNS Server that permits an unauthorized network attacker to execute arbitrary code. The weakness is identified as CWE‑416 and leads directly to remote code execution, which can compromise confidentiality, integrity, and availability of the affected host.

Affected Systems

The flaw affects Microsoft Windows Server 2022 and Windows Server 2025, including Server Core installations. No specific patch versions are listed.

Risk and Exploitability

The CVSS score of 8.1 indicates a high severity for remote exploitation. EPSS is not available, and the vulnerability is not listed in the CISA KEV catalog. The likely attack vector is remote, via the DNS protocol over a network connection, and an attacker does not need elevated privileges on the system to exploit this flaw.

Generated by OpenCVE AI on September 9, 2026 at 00:10 UTC.

Remediation

No vendor fix or workaround currently provided.

OpenCVE Recommended Actions

  • Apply the latest Microsoft security update that addresses the DNS use‑after‑free issue.
  • If the server can be configured, disable the DNS Server service or restrict it to trusted networks only.
  • Implement network segmentation and firewall rules to limit inbound DNS traffic to known clients and protect the server from untrusted sources.

Generated by OpenCVE AI on September 9, 2026 at 00:10 UTC.

Tracking

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Advisories

No advisories yet.

History

Wed, 16 Sep 2026 17:45:00 +0000

Type Values Removed Values Added
CPEs cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:x64:*

Wed, 09 Sep 2026 19:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Wed, 09 Sep 2026 16:30:00 +0000

Type Values Removed Values Added
First Time appeared Microsoft windows Server 2025 (server Core Installation)
Vendors & Products Microsoft windows Server 2025 (server Core Installation)

Tue, 08 Sep 2026 17:30:00 +0000

Type Values Removed Values Added
Description Use after free in Windows DNS allows an unauthorized attacker to execute code over a network.
Title Windows DNS Server Remote Code Execution Vulnerability
First Time appeared Microsoft
Microsoft windows Server 2022
Microsoft windows Server 2025
Weaknesses CWE-416
CPEs cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:*:*
Vendors & Products Microsoft
Microsoft windows Server 2022
Microsoft windows Server 2025
References
Metrics cvssV3_1

{'score': 8.1, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C'}

Subscriptions

Microsoft Windows Server 2022 Windows Server 2025 Windows Server 2025 (server Core Installation)
cve-icon MITRE

Status: PUBLISHED

Assigner: microsoft

Published:

Updated: 2026-09-25T21:36:40.303Z

Reserved: 2026-08-03T22:51:46.191Z

Link: CVE-2026-69858

cve-icon Vulnrichment

Updated: 2026-09-09T18:19:30.513Z

cve-icon NVD

Status : Analyzed

Published: 2026-09-08T18:19:57.143

Modified: 2026-09-16T17:32:51.910

Link: CVE-2026-69858

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-09-09T16:15:01Z

Weaknesses