Heap-based Buffer Overflow in Windows Kernel by Microsoft
CVE-2026-21239

7.8HIGH

Key Information:

Vendor

Microsoft
Status
Windows 10 Version 1607
Windows 10 Version 1809
Windows 10 Version 21h2
Windows 10 Version 22h2
Vendor
CVE Published:
10 February 2026

What is CVE-2026-21239?

A heap-based buffer overflow vulnerability in the Windows Kernel enables an authorized attacker to escalate privileges locally. This flaw allows the execution of arbitrary code with elevated permissions, potentially compromising the integrity and security of the affected system. Users and administrators should apply the latest security updates to mitigate this risk. For detailed information and remediation steps, refer to the vendor's advisory.

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Deploy the Patch

Affected Version(s)

Windows 10 Version 1607 32-bit Systems 10.0.14393.0 < 10.0.14393.8868

Windows 10 Version 1809 32-bit Systems 10.0.17763.0 < 10.0.17763.8389

Windows 10 Version 21H2 32-bit Systems 10.0.19044.0 < 10.0.19044.6937

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE...
vendor-advisorypatch

CVSS V3.1

Score:
7.8
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Local
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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