Search/CVE-2026-20921
● CVE — High

CVE-2026-20921

VendormicrosoftProductwindows server 2008, windows server 2012, windows 10 1607, windows 10 1809, windows 10 21h2, windows 10 22h2, windows 11 24h2, windows 11 25h2, windows server 2016, windows server 2019, windows server 2022, windows server 2025, windows 11 23h2, windows server 2022 23h2DiscoveredJan 13, 2026UpdatedJul 30, 2026

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

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CVSS v3.1
7.5 HIGH
EPSS
1.18%
probability of exploitation in 30 days
CISA KEV
Not listed
no confirmed exploitation reported
News coverage
1
sources referencing this CVE
Related IOCs
0
seen in the same coverage
EPSS Trend
Aug 16, 2026 → Oct 22, 2026
▼ 0.02pp
1.20% → 1.18% over 3 tracked changes
CVSS v3.1 Detail
Attack VectorNETWORK
Attack ComplexityHIGH
Privileges RequiredLOW
User InteractionNONE
ScopeUNCHANGED
ConfidentialityHIGH
IntegrityHIGH
AvailabilityHIGH
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Connections
16 relationships
Timeline
disclosure → media coverage
Jan 13, 2026
Disclosure — published as a CVE record. · last revised by NVD Jul 30, 2026
Jan 13, 2026
advisories.ncsc.nl reports: NCSC-2026-0007 [1.00] [M/H] Kwetsbaarheden verholpen in Microsoft Windows