Cyber Resilience

CVE-2025-64661

Race Condition in Microsoft Windows 10 1607 ≤ 10.0.14393.8688

Published
09 December 2025
Modified
10 December 2025
Patch / advisory
CVSS Score v3.1 7.8
Click a component to see what it means
Raw vectorCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
EPSS Score 0.0024 15th percentile
Risk Priority 55 floored blend · peak EPSS

Summary

CVE-2025-64661 is a high-severity Race Condition (CWE-362) vulnerability in Microsoft Windows 10 1607. Its CVSS base score is 7.8 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploitation for Privilege Escalation (T1068); ranked at the 15th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

The strongest mitigations our analysis identified map to AC-3 (Access Enforcement) and AC-6 (Least Privilege) — see the control section below for these in your framework.

OWASP Top 10 for Web (2025)

EU & UK References

Vulnerability Data

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

CWE(s)

Related Threats

MITRE ATT&CK Enterprise TechniquesAI

T1068 Exploitation for Privilege Escalation Privilege Escalation
Adversaries may exploit software vulnerabilities in an attempt to elevate privileges.
Why these techniques?

The race condition in Windows Shell directly enables local privilege escalation, mapping to T1068 (Exploitation for Privilege Escalation).

Confidence: HIGH · MITRE ATT&CK Enterprise v19.0

CVEs Like This One

CVE-2026-20836Same product: Microsoft Windows 10 1607
CVE-2026-20826Same product: Microsoft Windows 10 1607
CVE-2026-20814Same product: Microsoft Windows 10 1607
CVE-2026-32164Same product: Microsoft Windows 10 1607
CVE-2026-20848Same product: Microsoft Windows 10 1607
CVE-2026-20934Same product: Microsoft Windows 10 1607
CVE-2026-21231Same product: Microsoft Windows 10 1607
CVE-2026-20919Same product: Microsoft Windows 10 1607
CVE-2026-20926Same product: Microsoft Windows 10 1607
CVE-2026-24296Same product: Microsoft Windows 10 1607

Affected Assets

microsoft
windows 10 1607
≤ 10.0.14393.8688 · ≤ 10.0.14393.8688
microsoft
windows 10 1809
≤ 10.0.17763.8146 · ≤ 10.0.17763.8146
microsoft
windows 10 21h2
≤ 10.0.19044.6691
microsoft
windows 10 22h2
≤ 10.0.19045.6691
microsoft
windows 11 23h2
≤ 10.0.22631.6345
microsoft
windows 11 24h2
≤ 10.0.26100.7392
microsoft
windows 11 25h2
≤ 10.0.26200.7392
microsoft
windows server 2016
≤ 10.0.14393.8688
microsoft
windows server 2019
≤ 10.0.17763.8146
microsoft
windows server 2022
≤ 10.0.20348.4467
+2 more product configuration(s) — see NVD for full list

Mitigating Controls

Control response

Prevent
Stop it (NIST 800-53)
  • AC-6 Least Privilege
  • AC-3 Access Enforcement
  • SC-39 Process Isolation
Detect
Catch it (NIST detect / respond)

Harden
Shrink the surface (DISA STIG)

Validate
Prove the fix (OWASP ASVS)
  • V10.4.2
  • V10.4.5
  • V15.1.3
  • V15.4.1

Mitigating Controls (NIST 800-53 r5) AI

prevent

Least privilege directly limits the permissions an authorized local attacker can obtain via the race condition in Windows Shell.

prevent

Access enforcement ensures that concurrent operations cannot bypass authorization checks to elevate privileges.

prevent

Process isolation reduces the attack surface for shared-resource race conditions between user and system processes.

Mitigating Controls (NIST CSF 2.0) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.

PR.PS-06 mostly match
prevents

Secure SDLC practices directly require proper synchronization primitives and concurrency testing that prevent race conditions.

Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.

detects

Security testing can detect race conditions, but does not prevent them at design or coding time.

prevents

Secure SDLC mandates concurrency controls and synchronization primitives that directly prevent race conditions.

prevents

Application security requirements can specify thread-safety and locking rules, but do not prescribe implementation details.

prevents

Secure architecture principles require proper synchronization and resource isolation, addressing the root cause of CWE-362.

prevents

Secure coding standards explicitly forbid unsafe concurrent access patterns and mandate atomic operations or locks.

none

Change management reduces introduction of concurrency bugs during updates, yet does not address the weakness itself.

References