CVE-2025-21315: Microsoft Brokering File System Elevation of Privilege Vulnerability

Overview

Severity
High (CVSS 7.8)
CVSS Vector
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C
Category
Elevation of Privilege
Exploit Status
Not Exploited
Exploitation Likelihood
More Likely
Patch Tuesday
2025-Jan
Released
2025-01-14
EPSS Score
0.17% (percentile: 38.3%)

FAQ

According to the CVSS metric, the attack complexity is high (AC:H). What does that mean for this vulnerability? Successful exploitation of this vulnerability requires an attacker to win a race condition. What privileges could be gained by an attacker who successfully exploited the vulnerability? An attacker who successfully exploited this vulnerability could potentially gain the ability to crash the system by exploiting the use-after-free vulnerability, even as a standard user. According to the CVSS metric, successful exploitation could lead to a scope change (S:C). What does this mean for this vulnerability? In this case, a successful attack could be performed from a low privilege AppContainer. The attacker could elevate their privileges and execute code at a higher integrity level than that of the AppContainer execution environment.

Affected Products (5)

Windows

  • Windows Server 2025 (Server Core installation)
  • Windows Server 2022, 23H2 Edition (Server Core installation)
  • Windows 11 Version 24H2 for ARM64-based Systems
  • Windows 11 Version 24H2 for x64-based Systems
  • Windows Server 2025

Security Updates (2)

Acknowledgments

hazard

Revision History

  • 2025-01-14: Information published.