CVE-2026-20921 | BDVDB-2026-310448 Detail
MicrosoftWindows 10 Version 1607
Description#
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows SMB Server allows an authorized attacker to elevate privileges over a network.
Impact#
Per CVSS v3.1: confidentiality impact high, integrity impact high, availability impact high. Attack vector: network.
Weaknesses#
- CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
References#
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20921
- https://www.vicarius.io/vsociety/posts/cve-2026-20921-detection-script-race-condition-vulnerability-in-windows-smb-server
- https://www.vicarius.io/vsociety/posts/cve-2026-20921-remediation-script-race-condition-vulnerability-in-windows-smb-server
Exploit#
No public exploit known
History#
- Version 1Record published in the CVE List.
- Version 2Most recent update recorded in the CVE List.