Description
Use after free in DNS Server 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

A use‑after‑free condition in the Windows DNS Server enables an unauthorized attacker to run arbitrary code by sending specially crafted network traffic. The flaw allows remote execution without authentication, potentially compromising the integrity and confidentiality of the affected system.

Affected Systems

The vulnerability affects Microsoft Windows 10 versions 1607 and 1809, and all supported Windows Server releases from 2012 through 2025, including Server Core installations. Administrators should verify that their environment includes any of these operating systems.

Risk and Exploitability

The CVSS score of 8.1 indicates a high severity level. EPSS information is not available, so the probability of exploitation at this time is unknown, and the vulnerability is not listed in CISA’s KEV catalog. The likely attack vector is over the network; based on the description, it is inferred that an attacker can deliver the exploit without first authenticating to the DNS server.

Generated by OpenCVE AI on September 9, 2026 at 00:30 UTC.

Remediation

No vendor fix or workaround currently provided.

OpenCVE Recommended Actions

  • Apply the Microsoft Windows DNS Server update released for CVE-2026-69989
  • Configure firewall rules to restrict inbound DNS traffic to known and trusted IP addresses
  • Monitor DNS server logs for anomalous query patterns or errors indicative of exploitation attempts

Generated by OpenCVE AI on September 9, 2026 at 00:30 UTC.

Tracking

Sign in to view the affected projects.

Advisories

No advisories yet.

History

Wed, 16 Sep 2026 19:15:00 +0000

Type Values Removed Values Added
CPEs cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_server_2012:-:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2012:r2:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2016:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_server_2019:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:x64:*

Thu, 10 Sep 2026 21:30:00 +0000

Type Values Removed Values Added
First Time appeared Microsoft windows Server 2012 (server Core Installation)
Microsoft windows Server 2012 R2
Microsoft windows Server 2012 R2 (server Core Installation)
Microsoft windows Server 2016 (server Core Installation)
Microsoft windows Server 2019 (server Core Installation)
Microsoft windows Server 2025 (server Core Installation)
Vendors & Products Microsoft windows Server 2012 (server Core Installation)
Microsoft windows Server 2012 R2
Microsoft windows Server 2012 R2 (server Core Installation)
Microsoft windows Server 2016 (server Core Installation)
Microsoft windows Server 2019 (server Core Installation)
Microsoft windows Server 2025 (server Core Installation)

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'}

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

Type Values Removed Values Added
Description Use after free in DNS Server allows an unauthorized attacker to execute code over a network.
Title Windows DNS Server Remote Code Execution Vulnerability
First Time appeared Microsoft
Microsoft windows 10 1607
Microsoft windows 10 1809
Microsoft windows Server 2012
Microsoft windows Server 2012 R2
Microsoft windows Server 2016
Microsoft windows Server 2019
Microsoft windows Server 2022
Microsoft windows Server 2025
Weaknesses CWE-416
CPEs cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:x86:*
cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x86:*
cpe:2.3:o:microsoft:windows_server_2012:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_server_2012_R2:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_server_2016:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2019:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:*:*
Vendors & Products Microsoft
Microsoft windows 10 1607
Microsoft windows 10 1809
Microsoft windows Server 2012
Microsoft windows Server 2012 R2
Microsoft windows Server 2016
Microsoft windows Server 2019
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 10 1607 Windows 10 1809 Windows Server 2012 Windows Server 2012 (server Core Installation) Windows Server 2012 R2 Windows Server 2012 R2 Windows Server 2012 R2 (server Core Installation) Windows Server 2016 Windows Server 2016 (server Core Installation) Windows Server 2019 Windows Server 2019 (server Core Installation) Windows Server 2022 Windows Server 2025 Windows Server 2025 (server Core Installation)
cve-icon MITRE

Status: PUBLISHED

Assigner: microsoft

Published:

Updated: 2026-09-25T21:33:56.733Z

Reserved: 2026-08-03T23:04:57.748Z

Link: CVE-2026-69989

cve-icon Vulnrichment

Updated: 2026-09-09T18:36:34.710Z

cve-icon NVD

Status : Analyzed

Published: 2026-09-08T18:20:03.047

Modified: 2026-09-24T23:18:37.107

Link: CVE-2026-69989

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-09-10T21:05:09Z

Weaknesses