Windows Services for NFS ONCRPC XDR Driver Remote Code Execution Vulnerability
Published September 8, 2026Updated September 8, 2026
Source data
Overview
Use after free in Windows Services for NFS ONCRPC XDR Driver allows an unauthorized attacker to execute code over a network.
Impact & technical details
Remote Code Execution
How could an attacker exploit this vulnerability? This vulnerability could be exploited over the network by making an unauthenticated, specially crafted call to a Network File System (NFS) service to trigger a Remote Code Execution (RCE).
- CVSS base score
- 9.8 / 10
- CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
Highest base score supplied by MSRC for this record; the vector belongs to that score. Ratings can vary by product. Microsoft Important is displayed as High; Moderate is displayed as Medium.
Affected products
- Windows Server 2012
- Windows Server 2012 (Server Core installation)
- Windows Server 2012 R2
- Windows Server 2012 R2 (Server Core installation)
- Windows Server 2016
- Windows Server 2016 (Server Core installation)
- Windows Server 2019
- Windows Server 2019 (Server Core installation)
Show all 12 affected products
- Windows Server 2022
- Windows Server 2022 (Server Core installation)
- Windows Server 2025
- Windows Server 2025 (Server Core installation)
Source guidance
Remediation
The source provides update references without a separate remediation summary. Review the applicable update links below.
At least one Microsoft vendor-fix reference is available. Check each affected product for its applicable update, prerequisites, and supported version.
GTP recommendation · Rule-based guidance
Recommended next step
Review affected systems and prioritize deployment of the vendor security update.
Authoritative sources & updates
Findings and update information come from the linked publishers. GTP compiles the public record and provides the recommendation above. CVSS ratings shown here come from Microsoft. NVD references provide additional public context.
- Microsoft Security Response Center (opens in a new tab)
- Microsoft security update · 5122876 (opens in a new tab)
- Microsoft remediation guidance (opens in a new tab)
- Microsoft security update · 5122882 (opens in a new tab)
- Microsoft remediation guidance (opens in a new tab)
- Microsoft security update · 5122871 (opens in a new tab)
- Microsoft remediation guidance (opens in a new tab)
- Microsoft security update · 5123099 (opens in a new tab)
- Microsoft remediation guidance (opens in a new tab)
- Microsoft security update · 5123065 (opens in a new tab)
- Microsoft remediation guidance (opens in a new tab)
- Microsoft security update · 5123066 (opens in a new tab)
- Microsoft remediation guidance (opens in a new tab)
Managed by GTP?
Griffin Technology Partners managed customers may receive additional environment-specific security guidance and remediation assistance through their managed services relationship.
Security bulletins are provided for informational purposes and compiled from authoritative public sources. Vulnerability applicability varies by environment. Validate affected products, configuration, compatibility requirements, and vendor guidance before making production changes.