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Severity by source

Vendor (microsoft) PRIMARY
MEDIUM
qualitative
NVD
8.1 HIGH
AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
CIRCL (temporal)
5.2 MEDIUM
cvss

Primary rating from Vendor (microsoft).

CVSS VectorNVD

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

5
Analysis Generated
Jul 22, 2026 - 16:31 vuln.today
Severity Changed
Jul 17, 2026 - 13:52 NVD
MEDIUM HIGH
CVSS changed
Jul 17, 2026 - 13:52 NVD
5.9 (MEDIUM) 8.1 (HIGH)
CVE Published
Jul 14, 2026 - 17:09 cve.org
MEDIUM 5.9
CVE Published
Jul 14, 2026 - 17:09 nvd
HIGH 8.1

DescriptionNVD

Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Network File System allows an unauthorized attacker to execute code over a network.

AnalysisAI

Remote code execution in Microsoft's Windows Network File System (NFS) server role affects a broad range of Windows client and server builds from Windows Server 2012 through Windows Server 2025 and Windows 10/11. An unauthenticated network attacker who wins a race condition in a shared NFS resource can execute arbitrary code on the target. There is no public exploit identified at time of analysis and CISA SSVC rates exploitation as none; EPSS is low at 0.64% (47th percentile), consistent with the high attack complexity of racing the vulnerable code path.

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CVE-2026-56649 vulnerability details – vuln.today

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