CVE-2025-55684 Overview
CVE-2025-55684 is a use-after-free vulnerability [CWE-416] in the Windows PrintWorkflowUserSvc service. The flaw allows a locally authenticated attacker to elevate privileges on affected Windows systems. Microsoft assigned this issue a CVSS 3.1 base score of 7.0. Successful exploitation grants high impact to confidentiality, integrity, and availability. The vulnerability affects Windows 11 24H2, Windows 11 25H2, and Windows Server 2025. Microsoft published the advisory on October 14, 2025 as part of its security update guide.
Critical Impact
A local attacker with low privileges who wins a race condition against PrintWorkflowUserSvc can execute code in a higher-privileged context and gain full control of the affected host.
Affected Products
- Microsoft Windows 11 24H2
- Microsoft Windows 11 25H2
- Microsoft Windows Server 2025
Discovery Timeline
- 2025-10-14 - CVE-2025-55684 published to NVD
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2025-55684
Vulnerability Analysis
The Print Workflow User Service (PrintWorkflowUserSvc) manages per-user print workflow applications on modern Windows platforms. This vulnerability is a use-after-free condition [CWE-416] in that service. A use-after-free occurs when code continues to reference a memory object after it has been released, allowing an attacker to influence the contents of that freed memory.
An attacker who controls the reused allocation can steer the dangling pointer to attacker-shaped data. When PrintWorkflowUserSvc subsequently dereferences the freed object, control flow or object state can be hijacked. Because the service runs with elevated rights, the attacker inherits those privileges on the local machine.
Root Cause
The root cause is improper object lifetime management within PrintWorkflowUserSvc. A code path frees a heap object without invalidating outstanding references. Concurrent operations then dereference the stale pointer. This class of defect is a common source of local privilege escalation in Windows user-mode services.
Attack Vector
Exploitation requires local access and valid low-privileged credentials on the target host. No user interaction is required. The attack complexity is rated high because the attacker must reliably win a race window and shape the heap to place attacker-controlled data at the freed allocation. Successful exploitation yields code execution in the security context of the print workflow service and enables full compromise of the endpoint.
No public proof-of-concept has been published, and CISA has not added the entry to the Known Exploited Vulnerabilities catalog. See the Microsoft Security Update CVE-2025-55684 advisory for vendor-supplied technical detail.
Detection Methods for CVE-2025-55684
Indicators of Compromise
- Unexpected crashes or restarts of PrintWorkflowUserSvc recorded in the Windows Application and System event logs.
- Creation of new privileged local accounts or scheduled tasks shortly after print workflow activity from a standard-user session.
- Unusual child processes spawned by svchost.exe hosting the print workflow service.
Detection Strategies
- Monitor Windows Error Reporting (WER) and Application Error events referencing PrintWorkflowUserSvc.dll or the hosting svchost.exe instance.
- Hunt for token manipulation and integrity-level elevation from processes originating in low-integrity user sessions.
- Correlate print spooler and print workflow activity with subsequent process creation events using Sysmon Event ID 1 and Windows Security Event ID 4688.
Monitoring Recommendations
- Enable command-line auditing and process creation logging on all Windows 11 24H2, 25H2, and Server 2025 endpoints.
- Baseline normal PrintWorkflowUserSvc behavior per user and alert on deviations such as repeated service restarts.
- Forward endpoint telemetry to a centralized analytics platform to correlate service crashes with subsequent privilege changes.
How to Mitigate CVE-2025-55684
Immediate Actions Required
- Apply the Microsoft security update referenced in the MSRC advisory for CVE-2025-55684 to all affected hosts.
- Prioritize patch deployment on multi-user systems, terminal servers, and shared workstations where local access by low-privileged users is expected.
- Audit accounts with interactive logon rights and remove unnecessary local access to reduce the exploitable population.
Patch Information
Microsoft addressed CVE-2025-55684 through its October 2025 security update cycle. Refer to the Microsoft Security Update CVE-2025-55684 guide for the specific KB article and update package that applies to each affected build of Windows 11 24H2, Windows 11 25H2, and Windows Server 2025.
Workarounds
- Where print workflow functionality is not required, disable the PrintWorkflowUserSvc service to remove the vulnerable code path.
- Restrict interactive and Remote Desktop logon rights on servers to trusted administrative accounts only.
- Apply application control policies such as Windows Defender Application Control (WDAC) to block unauthorized binaries used to stage local exploitation.
# Query the Print Workflow User Service state on an affected host
sc.exe query PrintWorkflowUserSvc
# Temporarily disable the service where print workflow is not required
sc.exe config PrintWorkflowUserSvc start= disabled
sc.exe stop PrintWorkflowUserSvc
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
