Remote code execution via DNS Server race
Published Sep 8, 2026 · Updated Sep 9, 2026
A race condition in Microsoft Windows DNS Server allows remote attackers to execute code through crafted network traffic. Concurrent DNS Server execution accesses a shared resource without proper synchronization; Microsoft has not identified the affected function or request field. No authentication or user interaction is required, but exploitation requires winning the race and grants code execution in the DNS Server security context.
Summary
What happened
A race condition in Microsoft Windows DNS Server allows remote attackers to execute code through crafted network traffic. Concurrent DNS Server execution accesses a shared resource without proper synchronization; Microsoft has not identified the affected function or request field. No authentication or user interaction is required, but exploitation requires winning the race and grants code execution in the DNS Server security context.
The record
- CVE
- CVE-2026-69827
- Published
- Sep 8, 2026
- Updated
- Sep 9, 2026
- Vendor
- Microsoft
- Product
- Windows Server 2019
- Classifications
- CWE-362, CWE-416, T1190
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Sep 8, 2026CVE publishedPublication date reported by the CVE source.
- Sep 9, 2026Record 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.
- Affected versionversion=10.0.17763.0 <10.0.17763.9245
What conditions does exploitation require?
What is affected?
Published CVSS scores
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.
Weakness, pattern, technique
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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