Unauthenticated information disclosure via ONCRPC XDR processing
Published Sep 8, 2026 · Updated Sep 10, 2026
Information disclosure in Microsoft Windows Services for NFS ONCRPC XDR Driver allows remote attackers to read sensitive system information. Microsoft has not published the malformed input, affected routine, or incorrect operation performed by the ONCRPC XDR driver. Exploitation requires network reachability to the relevant NFS component but requires neither authentication nor user interaction, and the documented consequence is confidentiality loss only.
Summary
What happened
Information disclosure in Microsoft Windows Services for NFS ONCRPC XDR Driver allows remote attackers to read sensitive system information. Microsoft has not published the malformed input, affected routine, or incorrect operation performed by the ONCRPC XDR driver. Exploitation requires network reachability to the relevant NFS component but requires neither authentication nor user interaction, and the documented consequence is confidentiality loss only.
The record
- CVE
- CVE-2026-71330
- Published
- Sep 8, 2026
- Updated
- Sep 10, 2026
- Vendor
- Microsoft
- Product
- Windows Server 2019
- Classifications
- CWE-497, T1190
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Sep 8, 2026CVE publishedPublication date reported by the CVE source.
- Sep 10, 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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