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VULNERABILITIES

CVE-2026-20810 Details

Description

Free of memory not on the heap in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.

Metrics

CVSS 3.x Severity and Vector Strings:

CNA: [email protected]CVSS-B:7.8 HIGHVector:CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References to Advisories, Solutions, and Tools

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URLSource(s)Tag(s)
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20810 [email protected]Vendor Advisory

Weakness Enumeration

CWE-IDCWE NameSource
CWE-590Free of Memory not on the Heap[email protected]

Affected Products

ProductVersions
microsoft windows 10 1809
< 10.0.17763.8276

CPE

  • cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x64:*
  • cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x86:*

Remediation

  • No remediation found in references.
microsoft windows 10 21h2
< 10.0.19044.6809

CPE

  • cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:*:*

Remediation

  • No remediation found in references.
microsoft windows 10 22h2
< 10.0.19045.6809

CPE

  • cpe:2.3:o:microsoft:windows_10_22h2:*:*:*:*:*:*:*:*

Remediation

  • No remediation found in references.
microsoft windows server 2019
< 10.0.17763.8276

CPE

  • cpe:2.3:o:microsoft:windows_server_2019:*:*:*:*:*:*:*:*

Remediation

  • No remediation found in references.

Change History

4 change records found show changes

QUICK INFO

CVE Dictionary Entry:
CVE-2026-20810
NVD Published Date:
Jan 13, 2026
NVD Last Modified:
Jun 17, 2026
Source:
[email protected]
CVE-2026-20810 Details - Not Deferred