Network service interruption via integer overflow
Published Sep 8, 2026 · Updated Sep 9, 2026
Integer overflow in Windows DNS across affected Windows releases allows remote attackers to interrupt DNS service over a network. Microsoft identifies the weakness class but has not published the affected function, input field, or arithmetic operation that wraps. Unauthenticated network access is sufficient, and the reported consequence is loss of DNS availability rather than data disclosure or modification.
Summary
What happened
Integer overflow in Windows DNS across affected Windows releases allows remote attackers to interrupt DNS service over a network. Microsoft identifies the weakness class but has not published the affected function, input field, or arithmetic operation that wraps. Unauthenticated network access is sufficient, and the reported consequence is loss of DNS availability rather than data disclosure or modification.
The record
- CVE
- CVE-2026-69631
- Published
- Sep 8, 2026
- Updated
- Sep 9, 2026
- Vendor
- Microsoft
- Product
- Windows Server 2019
- Classifications
- CWE-190, 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=10.0.17763.0 <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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