What is the CVSS score of CVE-2026-20927?

CVE-2026-20927 has a CVSS 3.1 base score of 5.3 (Medium). CVSS vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H. EPSS exploitation probability: 0.0%.

Which versions of Windows are affected by CVE-2026-20927?

CVE-2026-20927 presents moderate security risk, a race condition vulnerability rated CVSS 5.3. Exploitation could compromise the security of affected deployments.. A patch is available.

Windows CVE-2026-20927

MEDIUM

Race Condition (CWE-362)

2026-01-13 secure@microsoft.com

Windows Race Condition Windows Server 2022 Windows 11 24h2 Windows 10 21h2 Windows 10 1809 Windows 11 23h2 Windows 10 1607 Windows 11 25h2 Windows Server 2016 Windows 10 22h2 Windows Server 2025 Windows Server 2019 Windows Server 2008 Windows Server 2012 Windows Server 2022 23h2 Microsoft

5.3

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

5.3 MEDIUM

AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

Attack Vector

Network

Attack Complexity

High

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Lifecycle Timeline

Analysis Generated

Mar 12, 2026 - 21:54 vuln.today

CVE Published

Jan 13, 2026 - 18:16 nvd

MEDIUM 5.3

DescriptionCVE.org

Concurrent execution using shared resource with improper synchronization ('race condition') in Windows SMB Server allows an authorized attacker to deny service over a network.

AnalysisAI

Windows SMB Server denial of service via race condition affects Windows 10 21h2, Windows 11 24h2, and Windows Server 2022, allowing authenticated attackers to disrupt service availability through improper synchronization of shared resources. The vulnerability requires network access and specific conditions to trigger but carries no patch availability at this time. …

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Vulnerability AssessmentAI

Risk Assessment	CVSS 5.3 (MEDIUM). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario	A remote attacker could exploit this vulnerability to compromise the affected system.
Remediation	Monitor vendor advisories for a patch. … Detailed patch versions, workarounds, and compensating controls in full report.

Recommended ActionAI

Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. …

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CVE-2026-20927 vulnerability details – vuln.today

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Windows CVE-2026-20927

Severity by source

CVSS VectorNVD

Lifecycle Timeline

DescriptionCVE.org

AnalysisAI

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Recommended ActionAI

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