CVE-2025-50166 in Windows
Summary
by MITRE • 08/12/2025
Integer overflow or wraparound in Windows Distributed Transaction Coordinator allows an authorized attacker to disclose information over a network.
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Analysis
by VulDB Data Team • 11/22/2025
The vulnerability identified as CVE-2025-50166 resides within the Windows Distributed Transaction Coordinator component, a critical system service responsible for managing distributed transactions across multiple resources in enterprise environments. This flaw represents a classic integer overflow condition that occurs when the system processes transaction data structures containing improperly validated integer values. The Distributed Transaction Coordinator service operates at a low system level and maintains extensive communication channels with various networked components, making it an attractive target for attackers seeking to exploit system weaknesses. The vulnerability specifically manifests when the service handles transaction identifiers or resource management parameters that exceed maximum integer limits, causing wraparound behavior that can result in unexpected program execution states. The integer overflow condition typically occurs during transaction processing when the system attempts to allocate memory or compute transaction-related values that exceed the capacity of their designated integer data types.
The technical exploitation of this vulnerability requires an authorized attacker with sufficient privileges to interact with the Distributed Transaction Coordinator service, which typically means access to a system with appropriate network permissions or local administrative rights. Attackers can leverage this condition to cause the service to behave unpredictably, potentially leading to information disclosure through memory corruption or pointer manipulation. The wraparound behavior can result in the service returning corrupted data or revealing memory contents that would normally be protected from external access. This particular flaw operates at the kernel level within the Windows operating system, making it particularly dangerous as it can be exploited to gain deeper system insights or potentially escalate privileges. The vulnerability's network exposure means that it can be triggered remotely, allowing attackers to potentially exploit it from outside the local network perimeter without requiring physical access to the target system.
The operational impact of CVE-2025-50166 extends beyond simple information disclosure, as it represents a foundational weakness in transaction management that could compromise the integrity of distributed systems. Organizations utilizing Windows Distributed Transaction Coordinator for mission-critical applications face significant risk from this vulnerability, particularly in environments where transactional consistency is paramount. The information disclosure could potentially reveal sensitive transaction data, system resource information, or internal memory structures that could aid in further exploitation attempts. Security teams must consider this vulnerability in their risk assessments for systems handling financial transactions, database operations, or any scenario requiring reliable distributed transaction processing. The distributed nature of the service means that exploitation could potentially affect multiple systems within a network segment, making the impact more widespread than initially apparent. This vulnerability aligns with CWE-190, which specifically addresses integer overflow conditions, and could potentially map to attack patterns in the MITRE ATT&CK framework under techniques related to privilege escalation and information gathering.
Mitigation strategies for CVE-2025-50166 should prioritize immediate patch deployment from Microsoft, as the vulnerability represents a critical security weakness requiring vendor-provided fixes. Organizations should implement network segmentation to limit access to Distributed Transaction Coordinator services, reducing the attack surface available to potential adversaries. System administrators should monitor for unusual transaction processing patterns or service behavior that could indicate exploitation attempts, particularly focusing on the transaction coordinator logs and system event records. Regular security assessments should include vulnerability scanning for the Distributed Transaction Coordinator service and related transaction management components. Additionally, implementing strict access controls and privilege separation can help minimize the impact if exploitation occurs, as unauthorized users would still require additional credentials or system access to leverage the vulnerability effectively. Organizations should also consider implementing network monitoring solutions that can detect anomalous traffic patterns associated with transaction coordinator communications, providing early warning capabilities for potential exploitation attempts.