CVE-2026-20810

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2026-20810
Free of memory not on the heap in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.

7.8 /10

CVSS v3 : HIGH

V3 Legend

Vector :

Exploitability : 1.8 / Impact : 5.9

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References
Link Resource
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20810 Vendor Advisory
Configurations

Configuration 1 (hide)

OR cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x86:*
cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_10_22h2:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2019:*:*:*:*:*:*:*:*
History

14 Jan 2026, 20:12

Type Values Removed Values Added
First Time Microsoft windows 10 1809
Microsoft windows 10 21h2
Microsoft
Microsoft windows 10 22h2
Microsoft windows Server 2019
References () https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20810 - () https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20810 - Vendor Advisory
CPE cpe:2.3:o:microsoft:windows_server_2019:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x86:*
cpe:2.3:o:microsoft:windows_10_22h2:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:*:*

13 Jan 2026, 18:16

Type Values Removed Values Added
New CVE
Information

Published : 2026-01-13 18:16

Updated : 2026-01-14 20:12

NVD link : CVE-2026-20810

Mitre link : CVE-2026-20810

CVE.ORG link : CVE-2026-20810

JSON object : View

Products Affected

microsoft

  • windows_10_1809
  • windows_server_2019
  • windows_10_21h2
  • windows_10_22h2
CWE
CWE-590

Free of Memory not on the Heap