EUVD-2026-73797
GHSA-xfjp-65r5-5w3m
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Unauthenticated network parsing bug in a kernel driver yields full system compromise, but only where the non-default NFS role is enabled (exposure limit, not a base-metric change).
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
5DescriptionCVE.org
Use after free in Windows Services for NFS ONCRPC XDR Driver allows an unauthorized attacker to execute code over a network.
Articles & Coverage 2
AnalysisAI
Remote code execution in the Windows Services for NFS ONCRPC XDR driver allows an unauthenticated network attacker to execute arbitrary code by triggering a use-after-free (CWE-416) in the driver that parses ONC RPC/XDR-encoded NFS traffic. All supported Windows Server releases (2012 through 2025, including Server Core) are affected when the Services for NFS role is enabled, and Microsoft rates it critical (CVSS 9.8). …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Requires the target Windows Server to have the Services for NFS role installed and enabled with the ONC RPC/NFS network endpoints (portmapper 111, NFS 2049) reachable by the attacker - this role is not enabled by default, which is the principal limiting factor. … 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/S:U/C:H/I:H/A:H, 9.8) describes an unauthenticated, low-complexity, no-interaction network attack yielding full confidentiality, integrity, and availability impact - worst-case on paper, and credible given a kernel-mode driver target. … 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 | Apply the Microsoft security update for CVE-2026-78445 per the MSRC advisory (https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-78445), upgrading to at least the fixed build for your release: 6.2.9200.26349 (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). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify all Windows Server 2012, 2016, 2019, 2022, and 2025 deployments with Services for NFS role enabled, focusing inventory efforts on production file servers and critical data center infrastructure that would be high-value targets. …
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Same weakness CWE-416 – Use After Free
View allSame technique Use After Free
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External POC / Exploit Code
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