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CVE

CVE-2026-27921

Concurrent execution using shared resource with improper synchronization ('race condition') in Windows TCP/IP allows an

Concurrent execution using shared resource with improper synchronization ('race condition') in Windows TCP/IP allows an authorized attacker to elevate privileges locally.

HIGH · CVSS 7 EPSS 0.00063
Schedule remediation
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
CWE-416Use After Free
▤

Affected Products & Versions

14
microsoft windows 10 1607< 10.0.14393.9060
microsoft windows 10 1809< 10.0.17763.8644
microsoft windows 10 21h2< 10.0.19044.7184
microsoft windows 10 22h2< 10.0.19045.7184
microsoft windows 11 23h2< 10.0.22631.6936
microsoft windows 11 24h2< 10.0.26100.8246
microsoft windows 11 25h2< 10.0.26200.8246
microsoft windows 11 26h1< 10.0.28000.1836
▣

Scoring & Timeline

7
HIGH · CVSS v3.1 · secure@microsoft.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD14 Apr 2026 · 06:17 PM
CVSS VectorCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC triage · cisa-vulnrichment
Exploitation
none
Automatable
no
Technical impact
total
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
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Vendor Advisories

1
msrcCVE-2026-27921Elevation of Privilege
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