Microsoft CVE-2026-20921
HIGHCVSS VectorNVD
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
2DescriptionNVD
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows SMB Server allows an authorized attacker to elevate privileges over a network.
AnalysisAI
Privilege escalation in Windows SMB Server (2022, 2025) stems from improper synchronization of concurrent resource access, enabling authenticated network attackers to gain elevated privileges. The vulnerability requires specific conditions to trigger but provides high-impact unauthorized access when successfully exploited. …
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RemediationAI
Within 7 days: Identify all affected systems and apply vendor patches promptly. Monitor vendor channels for patch availability.
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