CVE-2026-33099

CWE-416 — Use After Free3 documents3 sources
Severity
7.0HIGH
EPSS
No EPSS data
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
17
Microsoft Windows 10 Version 1607Microsoft Windows 10 Version 1809Microsoft Windows 10 Version 21h2+14 more
Timeline
PublishedApr 14

Description

Use after free in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.

CVSS vector

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:HExploitability: 1.0 | Impact: 5.9

Affected Packages17 packages

▶CVEListV5microsoft/windows_server_20126.2.9200.0 — 6.2.9200.26026
▶CVEListV5microsoft/windows_server_201610.0.14393.0 — 10.0.14393.9060
▶CVEListV5microsoft/windows_server_201910.0.17763.0 — 10.0.17763.8644
▶CVEListV5microsoft/windows_server_202210.0.20348.0 — 10.0.20348.5020
▶CVEListV5microsoft/windows_server_2012_r26.3.9600.0 — 6.3.9600.23132

🔴Vulnerability Details

2
VulDB
Microsoft Windows up to Server 2022 23H2 Ancillary Function Driver for WinSock use after free↗2026-04-14
▶
CVEList
Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability↗2026-04-14
▶
CVE-2026-33099 (HIGH CVSS 7) | Use after free in Windows Ancillary | cvebase.io