EUVD-2026-73812
GHSA-3hc3-53gq-8p3c
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Unauthenticated network RCE justifies AV:N/PR:N and full CIA impact, but reliably weaponizing a driver use-after-free needs heap grooming/timing, so AC:H over Microsoft's AC:L.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Use after free in Windows Services for NFS ONCRPC XDR Driver allows an unauthorized attacker to execute code over a network.
AnalysisAI
Remote code execution in Microsoft's Windows Services for NFS role - specifically the ONCRPC XDR driver - allows a network attacker to trigger a use-after-free (CWE-416) and execute arbitrary code without authentication. All supported Windows Server releases from Server 2012 through Server 2025 (including Server Core installations) are affected when the Services for NFS role is present. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the target Windows Server to have the optional Services for NFS role installed and the ONCRPC/NFS RPC endpoint (typically portmapper TCP/UDP 111 and NFS 2049) reachable by the attacker; the vulnerable ONCRPC XDR driver is not present or exposed on default installations without this role. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector (AV:N/AC:L/PR:N/UI:N, C:H/I:H/A:H, 9.8) describes an ideal remote-unauthenticated RCE, and the SSVC-relevant signals - network reachable, no privileges, no user interaction, total technical impact - all point to high priority IF the role is exposed. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Vendor-released patch: apply the cumulative security update that raises the build to at least 6.2.9200.26349 (Server 2012), 6.3.9600.23397 (2012 R2), 10.0.14393.9512 (2016), 10.0.17763.9245 (2019), 10.0.20348.5622 (2022), or 10.0.26100.33438 (2025), per the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69595. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Windows Server 2012, 2016, 2019, and 2025 installations with the Services for NFS role enabled, including Server Core deployments, and flag them for emergency patching. …
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Same weakness CWE-416 – Use After Free
View allSame technique Denial Of Service
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External POC / Exploit Code
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