Denial of service via Kerberos null dereference
Published Sep 8, 2026 · Updated Sep 9, 2026
Denial of service in Windows Kerberos on affected Windows 11 and Server 2025 builds allows remote attackers to interrupt service. Kerberos dereferences a null pointer while processing network input, but Microsoft has not identified the specific message, function, or validation failure. No authentication or user interaction is required, and successful exploitation affects availability without reported data disclosure or modification.
Summary
What happened
Denial of service in Windows Kerberos on affected Windows 11 and Server 2025 builds allows remote attackers to interrupt service. Kerberos dereferences a null pointer while processing network input, but Microsoft has not identified the specific message, function, or validation failure. No authentication or user interaction is required, and successful exploitation affects availability without reported data disclosure or modification.
The record
- CVE
- CVE-2026-69744
- Published
- Sep 8, 2026
- Updated
- Sep 9, 2026
- Vendor
- Microsoft
- Product
- Windows Server 2025 (Server Core installation)
- Classifications
- CWE-476, T1499.004
- 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=10.0.26100.0 <10.0.26100.33438
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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