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CVE-2026-20810 - Windows 10 Version 1809 Plugin

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.

CVE-2026-20810

HIGH CVSS 7.8 Published 2026-01-13 Updated 2026-01-14
AI Risk Elevated (70/100) Active Exploit: No strong signal Published Exploit: No public exploit references Priority: P3 Priority
Severity Band HIGH
CVSS Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Affected Components 4
Reference Links 1
AI Risk Engine Elevated (70/100)
Exploitability Medium
Active Exploitation No strong signal
Published Exploit Status No public exploit references

Threat Timeline

  1. 2026-01-13 CVE published and first recorded in the threat feed.
  2. 2026-01-14 Record updated with latest vulnerability metadata.
  3. 2026-04-09 AI technical context refreshed for mitigation and impact guidance.
  4. Now Monitoring for follow-up changes, linked references, and new related CVEs.

AI Context

Machine-generated threat intelligence

AI Updated 12 days ago

AI enriched 12 days ago (2026-04-09 08:06 UTC)

Technical Summary

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

Potential Impact

Severity is HIGH (CVSS 7.8). Depending on deployment context, affected components may be exposed to unauthorized actions or data integrity risk.

Exploitability Assessment

Exploitability is assessed as Medium based on severity and technical exposure profile.

Primary risk drivers: severity and technical exposure profile

Mitigation Recommendations

Validate affected product versions, prioritize patching, and monitor references for vendor remediation guidance. If immediate patching is not possible, apply compensating controls and limit exposure of vulnerable surfaces.

Detection & Monitoring

Track authentication anomalies, unexpected file writes, and suspicious plugin API activity around affected components.

Business Impact Lens

Prioritize remediation where affected components process customer data, admin sessions, or Internet-exposed workflows.

Affected Products

Windows 10 Version 1809 PLUGIN · windows-10-version-1809 Affected: >= 10.0.17763.0, < 10.0.17763.8276 Fixed in: 10.0.17763.8276
Windows 10 Version 21H2 PLUGIN · windows-10-version-21h2 Affected: >= 10.0.19044.0, < 10.0.19044.6809 Fixed in: 10.0.19044.6809
Windows 10 Version 22H2 PLUGIN · windows-10-version-22h2 Affected: >= 10.0.19045.0, < 10.0.19045.6809 Fixed in: 10.0.19045.6809
Windows Server 2019 PLUGIN · windows-server-2019 Affected: >= 10.0.17763.0, < 10.0.17763.8276 Fixed in: 10.0.17763.8276
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