Home/CVE/Free of memory not on the heap in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate
CVE

CVE-2026-20810

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

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

HIGH · CVSS 7.8 EPSS 0.0005
Schedule remediation
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-590Free of Memory not on the Heap
▤

Affected Products & Versions

4
microsoft windows 10 1809< 10.0.17763.8276
microsoft windows 10 21h2< 10.0.19044.6809
microsoft windows 10 22h2< 10.0.19045.6809
microsoft windows server 2019< 10.0.17763.8276
▣

Scoring & Timeline

7.8
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 NVD13 Jan 2026 · 06:16 PM
CVSS VectorCVSS:3.1/AV:L/AC:L/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-2026-20810Elevation of Privilege
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