Privilege escalation in Microsoft Windows Win32 Kernel Subsystem



Risk Low
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2025-49667
CWE-ID CWE-415
Exploitation vector Local
Public exploit N/A
Vulnerable software
 Windows
Operating systems & Components / Operating system

Windows Server
Operating systems & Components / Operating system

Vendor Microsoft

Security Bulletin

This security bulletin contains one low risk vulnerability.

1) Double free

EUVDB-ID: #VU112517

Risk: Low

CVSSv4.0: 5.9 [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/E:U/U:Clear]

CVE-ID: CVE-2025-49667

CWE-ID: CWE-415 - Double Free

Exploit availability: No

Description

The vulnerability allows a local user to gain elevated privileges on the system.

The vulnerability exists due to a boundary error in Windows Win32 Kernel Subsystem. A local user can pass specially crafted data to the application, trigger double free error and escalate privileges on the target system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Windows: 10 21H2 10.0.19041.3920 - 11 24H2 10.0.26100.4349

Windows Server: 2008 R2 SP1 - 2025 10.0.26100.4349

CPE2.3 External links

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-49667


Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.



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