CVE-2025-29841 Overview
CVE-2025-29841 is a race condition vulnerability in the Microsoft Universal Print Management Service. The flaw stems from concurrent execution using a shared resource with improper synchronization [CWE-362]. An authenticated local attacker can exploit the timing window to elevate privileges on affected Windows systems. Microsoft assigned this issue a CVSS 3.1 base score of 7.0 and rated it HIGH severity. The vulnerability affects a broad range of Windows client and server platforms, including Windows 10, Windows 11, and Windows Server 2022 and 2025. Microsoft published the advisory on May 13, 2025 as part of its coordinated security update process.
Critical Impact
Successful exploitation grants an authorized local attacker high impact on confidentiality, integrity, and availability through privilege elevation on the target host.
Affected Products
- Microsoft Windows 10 (21H2, 22H2) on x86, x64, and ARM64
- Microsoft Windows 11 (22H2, 23H2, 24H2) on x64 and ARM64
- Microsoft Windows Server 2022, Server 2022 23H2, and Server 2025
Discovery Timeline
- 2025-05-13 - CVE-2025-29841 published to NVD
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2025-29841
Vulnerability Analysis
The Universal Print Management Service coordinates print job submission, device enumeration, and policy enforcement on Windows. The service handles requests from multiple threads and processes concurrently. CVE-2025-29841 exists because access to a shared resource inside this service is not synchronized correctly. An authorized local user can race the service to manipulate state between a security check and the subsequent use of that state. Winning the race allows the attacker to have privileged operations performed on attacker-controlled input. The end result is code execution or file access in the context of a higher-privileged security principal.
Root Cause
The root cause is a classic time-of-check to time-of-use pattern classified under [CWE-362]. The service validates or references shared state, then performs a privileged action based on that state without holding an appropriate lock. Between those two steps, a concurrent thread controlled by the attacker replaces or mutates the shared resource. The privileged action then operates on substituted data.
Attack Vector
Exploitation requires local access and low-level authenticated privileges on the target system. The attacker must run code that interacts with the Universal Print Management Service while a second thread modifies the shared resource. Attack complexity is rated High because the attacker must reliably win a narrow timing window. No user interaction is required, and successful exploitation results in privilege elevation to a higher security context.
No verified public proof-of-concept code is available for CVE-2025-29841. Refer to the Microsoft Security Update Guide for authoritative technical details.
Detection Methods for CVE-2025-29841
Indicators of Compromise
- Unexpected child processes spawned by PrintWorkflowUserSvc or related Universal Print service binaries running with elevated tokens.
- Creation or modification of files in system-protected directories by low-privileged user sessions that recently interacted with print APIs.
- Anomalous handle duplication or impersonation events involving the Universal Print Management Service.
Detection Strategies
- Monitor for local processes making high-frequency, concurrent calls to Universal Print RPC or COM interfaces, which is atypical of legitimate print workflows.
- Correlate Windows Security event ID 4688 (process creation) with token elevation events originating from print service contexts.
- Baseline normal Universal Print service behavior and alert on deviations such as new file writes to %WINDIR%\System32 initiated via print operations.
Monitoring Recommendations
- Enable command-line auditing and PowerShell script block logging on all workstations and print servers.
- Forward Sysmon process, image load, and file creation events to a central analytics platform for correlation.
- Track patch state for KB updates addressing CVE-2025-29841 across the fleet and alert on unpatched hosts.
How to Mitigate CVE-2025-29841
Immediate Actions Required
- Apply the Microsoft security update for CVE-2025-29841 to all affected Windows 10, Windows 11, and Windows Server systems.
- Prioritize patching on multi-user systems such as Remote Desktop Session Hosts and print servers where local users are common.
- Restrict interactive and Remote Desktop logon rights to trusted administrative accounts until patches are deployed.
Patch Information
Microsoft released fixes for CVE-2025-29841 through its May 2025 security update cycle. Consult the Microsoft Security Update Guide for CVE-2025-29841 for the exact KB article numbers matching each supported Windows build. Verify installation using Get-HotFix or the Windows Update history after deployment.
Workarounds
- Disable the Universal Print Management Service on hosts that do not require Universal Print functionality until the patch is applied.
- Enforce least-privilege policies so that non-administrative users cannot execute arbitrary binaries needed to trigger the race condition.
- Segment print infrastructure and limit which endpoints can submit jobs to Universal Print endpoints.
# Verify the CVE-2025-29841 patch is installed and inspect the Universal Print service state
Get-HotFix | Sort-Object InstalledOn -Descending | Select-Object -First 10
Get-Service -Name PrintWorkflowUserSvc* | Format-List Name, Status, StartType
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
