CVE-2025-54108 Overview
CVE-2025-54108 is a race condition vulnerability in the Windows Capability Access Management Service (camsvc). The flaw stems from concurrent execution using a shared resource with improper synchronization [CWE-362]. An authorized local attacker who wins the race can elevate privileges on the affected host.
Microsoft published the advisory on September 9, 2025. The issue impacts Windows 11 24H2 and Windows Server 2025. Exploitation requires local access and low privileges, and the attack complexity is high because timing windows must be won reliably.
Critical Impact
Successful exploitation grants elevated privileges on Windows 11 24H2 and Windows Server 2025 systems, compromising confidentiality, integrity, and availability of the host.
Affected Products
- Microsoft Windows 11 24H2
- Microsoft Windows Server 2025
- Capability Access Management Service (camsvc)
Discovery Timeline
- 2025-09-09 - CVE-2025-54108 published to the National Vulnerability Database (NVD)
- 2025-09-09 - Microsoft releases advisory and security update for CVE-2025-54108
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2025-54108
Vulnerability Analysis
The Capability Access Management Service (camsvc) brokers access to sensitive device capabilities, including the camera, microphone, and location. The service mediates requests from user-mode applications and enforces per-app capability permissions.
CVE-2025-54108 exists because camsvc accesses a shared resource across concurrent execution paths without adequate synchronization. An attacker running as a standard authorized user can race the service to alter or observe state between a check and a subsequent action. When the race is won, the service performs a privileged operation using attacker-controlled or attacker-manipulated data.
The outcome is elevation of privilege to a higher-integrity security context on the local machine. The vulnerability affects all three security properties, allowing attackers to read protected data, modify capability state, and disrupt service operation.
Root Cause
The root cause is improper synchronization of a shared resource inside camsvc [CWE-362]. Two or more code paths operate on the same object without the locking or atomicity needed to prevent interleaved access, producing a time-of-check to time-of-use (TOCTOU) window.
Attack Vector
The attack vector is local. The attacker must already run code on the target host as an authorized user. Exploitation requires no user interaction but demands precise timing to hit the race window, which raises attack complexity.
Microsoft has not published exploit details. No public proof-of-concept, Exploit-DB entry, or CISA Known Exploited Vulnerabilities (KEV) listing exists for CVE-2025-54108 at the time of writing. Refer to the Microsoft CVE-2025-54108 Advisory for vendor guidance.
Detection Methods for CVE-2025-54108
Indicators of Compromise
- Unexpected privileged child processes spawned by svchost.exe instances hosting camsvc.
- Applications receiving capability grants (camera, microphone, location) they were not previously authorized to hold.
- Crashes or repeated restarts of the Capability Access Management Service in the System event log.
Detection Strategies
- Monitor process creation events (Windows Event ID 4688 and Sysmon Event ID 1) for anomalous children of camsvc-hosting svchost.exe.
- Baseline normal capability-grant activity and alert on out-of-pattern modifications to capability access state in the registry under HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\CapabilityAccessManager.
- Correlate low-privilege user sessions with subsequent SYSTEM- or high-integrity token activity on the same host.
Monitoring Recommendations
- Ingest Windows Security, System, and Sysmon logs into a centralized analytics platform for cross-host correlation.
- Alert on repeated rapid-fire opens of capability-related device objects, a pattern consistent with race exploitation attempts.
- Track patch compliance for the September 2025 Microsoft security updates across Windows 11 24H2 and Windows Server 2025 fleets.
How to Mitigate CVE-2025-54108
Immediate Actions Required
- Apply the Microsoft security update referenced in the Microsoft CVE-2025-54108 Advisory to all Windows 11 24H2 and Windows Server 2025 systems.
- Prioritize patching on multi-user hosts, jump servers, and virtual desktop infrastructure where local users are more likely to attempt privilege escalation.
- Audit local user and service accounts, removing unnecessary interactive logon rights.
Patch Information
Microsoft released a security update addressing CVE-2025-54108 on September 9, 2025. Administrators should deploy the corresponding cumulative update for Windows 11 24H2 and Windows Server 2025 through Windows Update, Windows Server Update Services (WSUS), or their preferred patch management tooling. Consult the Microsoft CVE-2025-54108 Advisory for the exact KB identifiers.
Workarounds
- No official workaround has been published by Microsoft. Patching is the required remediation.
- Reduce risk by enforcing least privilege, restricting local logon to trusted accounts, and disabling untrusted third-party applications that request capability access.
- Enable application allowlisting through Windows Defender Application Control (WDAC) or AppLocker to limit which binaries can interact with camsvc.
# Verify that the Windows 11 24H2 / Server 2025 host has the September 2025 update installed
Get-HotFix | Sort-Object -Property InstalledOn -Descending | Select-Object -First 10
# Confirm the Capability Access Manager service state
Get-Service -Name camsvc
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
