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CVE-2026-69730

Windows DNS Server Remote Code Execution Vulnerability

Published: Sep 8, 2026Updated: Sep 10, 2026 Sources: CVE List NVDCWE-416
9.8CRITICAL
NVD MITRE
EPSS Score
1.1%
Top 37.5%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available
Self-Check
OpenVAS

Description

Use after free in Windows DNS allows an unauthorized attacker to execute code over a network.

In plain language

AI Act now

CVE-2026-69730 is a Windows DNS Server bug that can let an attacker run code remotely; if you run DNS on the affected Windows versions, you should patch now.

Executive summary

CVE-2026-69730 is a remote code execution vulnerability in Windows DNS (CWE-416 use-after-free), triggered by crafted network requests to the DNS service that can lead to unauthorized code execution without authentication.

If affected, business impact
Full server takeoverWidespread network compromiseService disruptionData theft risk

What to do now

  1. Identify whether your organization is running Windows DNS on any of these systems: Windows 10, Windows Server 2012, Windows Server 2012 R2, Windows Server 2016, Windows Server 2019, Windows Server 2022, or Windows Server 2025.
  2. For each affected system, check the OS build/revision against the fixed versions listed by Microsoft.
  3. Patch each affected machine using Microsoft’s update for CVE-2026-69730, upgrading to the exact fixed version for your OS branch:
    • Windows 10: 10.0.14393.9512 or 10.0.17763.9245
    • Windows Server 2012: 6.2.9200.26349
    • Windows Server 2012 R2: 6.3.9600.23397
    • Windows Server 2016: 10.0.14393.9512
    • Windows Server 2019: 10.0.17763.9245
    • Windows Server 2022: 10.0.20348.5622
    • Windows Server 2025: 10.0.26100.33438
  4. After patching, confirm the DNS service is operating normally and that the system has successfully installed the security update from Microsoft’s update guidance for CVE-2026-69730.
  5. If you cannot patch immediately, reduce exposure by restricting network access to the DNS service (only allow required DNS clients) and monitor DNS-related logs for suspicious activity until patching is completed.
Patch / advisory Usually a quick update

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:HI:HA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
Open in CVSS calculator →

Weaknesses

CWE-416

Affected Products

Microsoft
commercial·US
Windows 10 Version 1607On-premOS
Operating Systems / windows
Windows Server 2012 (Server Core installation)On-premOS
Operating Systems / windows
Windows Server 2012 R2 (Server Core installation)On-premOS
Operating Systems / windows
Windows Server 2016 (Server Core installation)On-premOS
Operating Systems / windows
Windows Server 2019 (Server Core installation)On-premOS
Operating Systems / windows
Windows Server 2022On-premOS
Operating Systems / windows
Windows Server 2025 (Server Core installation)On-premOS
Operating Systems / windows
and 6 more affected products View all →

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.
Is your org exposed to CVE-2026-69730?We can run the check for you — a free external exposure review, no install. Check my exposure

Attack Graph

Products CVE Techniques Tactics

Click technique nodes for MITRE ATT&CK details · drag to pan · Ctrl/⌘ + scroll to zoom, or go fullscreen.

MITRE ATT&CK

2 techniques
Initial Access
Privilege Escalation
View detailed technique mapping

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69730
msrc.microsoft.com
News mentions
7

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