MSRC-CVE-2025-49677 — Microsoft Brokering File System Elevation of Privilege Vulnerability

Summary

Impact: Elevation of Privilege. Microsoft rating: Important. Not known to be exploited — Exploitation Less Likely. Customer action: Required.

Details

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 this vulnerability?
An attacker who successfully exploited this vulnerability could gain SYSTEM privileges.

Security updates
10.0.22621.5624 — https://support.microsoft.com/help/5062552

Vulnerabilities 1

High 7.0

CVE-2025-49677 Public exploit

Microsoft Brokering File System Elevation of Privilege Vulnerability

Use after free in Microsoft Brokering File System allows an authorized attacker to elevate privileges locally.

Microsoft Windows 11 version 22H2 Windows

Jul 8, 2025

Revision history

2025-07-08 #1
Information published.

References

CVE-2025-49677 Microsoft Brokering File System Elevation of Privilege Vulnerability - HTML
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-49677
Microsoft Exploitability Index
https://www.microsoft.com/en-us/msrc/exploitability-index?rtc=1
Microsoft Support Lifecycle
https://support.microsoft.com/lifecycle
Common Vulnerability Scoring System
https://www.first.org/cvss