Untrusted Pointer Dereference in Microsoft Windows and Windows Server - CVE-2025-49661

Vulnerability identifier: #VU112519

CSH Severity: Low

CVSS v4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2025-49661

CWE-ID: CWE-822

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to compromise the target system.

The vulnerability exists due to untrusted pointer dereference in Windows Ancillary Function Driver for WinSock. A local user can gain elevated privileges on the target system.

Microsoft Windows
Windows Server

Cybersecurity Help is currently unaware of any official solution to address this vulnerability..

Microsoft Windows - addressed in versions 10 21H2 10.0.19044.6093, 10 22H2 10.0.19045.6093, 10 1507 10.0.10240.21073, 10 1607 10.0.14393.8246, 10 1809 10.0.17763.7558, 11 22H2 10.0.22621.5624, 11 23H2 10.0.22631.5624, 11 24H2 10.0.26100.4652
Windows Server - addressed in versions 2008 R2 6.1.7601.27820, 2008 6.0.6003.23418, 2012 R2 6.3.9600.22676, 2012 6.2.9200.25573, 2016 10.0.14393.8246, 2019 10.0.17763.7558, 2022 23H2 10.0.25398.1732, 2022 10.0.20348.3932, 2025 10.0.26100.4652, 2025 10.0.26200.4349

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-49661

• Privilege escalation in Microsoft Windows Ancillary Function Driver for WinSock