Privilege escalation in Microsoft Brokering File System

1) Use-after-free

EUVDB-ID: #VU109100

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-2025-29970

CWE-ID: CWE-416 - Use After Free

Exploit availability: No

Description

The vulnerability allows a local user to compromise vulnerable system.

The vulnerability exists due to a use-after-free error in Microsoft Brokering File System. A local user can gain elevated privileges on the target system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Windows Server: 2012 Gold - 2025 10.0.26100.3775

Windows: 10 1607 10.0.14393.10 - 11 24H2 10.0.26100.3775

CPE2.3

• cpe:2.3:o:microsoft:windows_server:2012_Gold:*:*:*:*:*:*:*
• cpe:2.3:o:microsoft:windows_server:2012_R2:6.3.9600.21871:*:*:*:*:*:*
• cpe:2.3:o:microsoft:windows_server:2012_R2:6.3.9600.21924:*:*:*:*:*:*
• cpe:2.3:o:microsoft:windows_server:2012_R2:6.3.9600.21972:*:*:*:*:*:*
• cpe:2.3:o:microsoft:windows_server:2012_R2:6.3.9600.22023:*:*:*:*:*:*
• cpe:2.3:o:microsoft:windows_server:2012_R2:6.3.9600.22074:*:*:*:*:*:*
• cpe:2.3:o:microsoft:windows_server:2012_R2:6.3.9600.22134:*:*:*:*:*:*
• cpe:2.3:o:microsoft:windows_server:2012_R2:6.3.9600.22175:*:*:*:*:*:*
• cpe:2.3:o:microsoft:windows_server:2012_R2:6.3.9600.22221:*:*:*:*:*:*
• cpe:2.3:o:microsoft:windows_server:2012_R2:6.3.9600.22267:*:*:*:*:*:*
• cpe:2.3:o:microsoft:windows:10_1607:10.0.14393.10:*:*:*:*:*:*

External links

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-29970

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.