CVE-2026-20810 — Free of Memory not on the Heap in Microsoft Windows 10 Version 1809

CWE-590 — Free of Memory not on the Heap5 documents5 sources
Severity
7.8HIGHNVD
EPSS
0.0%
top 89.94%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
7
Microsoft Windows 10 Version 1809Microsoft Windows 10 Version 21h2Microsoft Windows 10 Version 22h2+4 more
Timeline
PublishedJan 13

Description

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

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HExploitability: 1.8 | Impact: 5.9

Affected Packages8 packages

▶NVDmicrosoft/windows< 10.0.17763.8276
▶NVDmicrosoft/windows_10_1809< 10.0.17763.8276
▶NVDmicrosoft/windows_10_21h2< 10.0.19044.6809
▶NVDmicrosoft/windows_10_22h2< 10.0.19045.6809
▶CVEListV5microsoft/windows_server_201910.0.17763.0 — 10.0.17763.8276

🔴Vulnerability Details

2
GHSA
GHSA-c77x-pfg5-gxc3: Free of memory not on the heap in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally↗2026-01-13
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CVEList
Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability↗2026-01-13
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📋Vendor Advisories

1
Microsoft
Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability↗2026-01-13
▶

🕵️Threat Intelligence

1
Wiz
CVE-2026-20810 Impact, Exploitability, and Mitigation Steps | Wiz↗
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CVE-2026-20810 — Free of Memory not on the Heap | cvebase