CVE-2025-30394 in Windows
Summary
by MITRE • 05/13/2025
Sensitive data storage in improperly locked memory in Remote Desktop Gateway Service allows an unauthorized attacker to deny service over a network.
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Analysis
by VulDB Data Team • 08/21/2026
The vulnerability identified within the Remote Desktop Gateway Service involves the improper locking of sensitive data in system memory, creating a significant security risk that extends beyond simple information disclosure into potential denial-of-service scenarios. In standard operating systems, when applications handle highly sensitive credentials or encryption keys, they are expected to lock these specific memory pages using specialized API calls such as VirtualLock on Windows platforms. This mechanism prevents the operating system from paging this data out to disk storage, thereby protecting it from being written to swap files where it could be recovered by attackers with local access. However, in this instance, the Remote Desktop Gateway Service fails to adequately enforce these memory protection mechanisms for certain critical operational buffers.
This architectural flaw allows an unauthorized attacker who has established a network connection to the vulnerable service to exploit the lack of memory isolation and integrity controls. By interacting with the improperly secured memory regions, the attacker can manipulate or corrupt sensitive data structures that are essential for the normal operation of the gateway service. The primary consequence described is the ability to deny service over a network. This occurs because the corruption or unauthorized modification of these locked but poorly protected memory segments disrupts the internal state machine of the Remote Desktop Gateway Service. When critical configuration parameters, session tokens, or authentication contexts are altered in memory by an external actor, the service may crash, become unresponsive, or enter a loop that prevents it from processing legitimate user requests effectively.
From a technical perspective, this vulnerability aligns with CWE-120 Buffer Overflow and CWE-787 Out-of-bounds Write if the exploitation involves writing beyond intended memory boundaries to corrupt adjacent structures. It also relates closely to CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization if race conditions are leveraged during the manipulation of these memory segments. Furthermore, in the context of the MITRE ATT&CK framework, this behavior is consistent with techniques found under T1498 Network Denial of Service and potentially T1557 Adversary-in-the-Middle if the attacker uses the compromised state to intercept or alter traffic before causing a disruption. The lack of proper memory locking means that even though the data resides in RAM, it lacks the necessary isolation guarantees required for high-security environments where Remote Desktop Gateway services are typically deployed as perimeter security devices.
The operational impact of this vulnerability is severe due to the critical role played by the Remote Desktop Gateway Service in enterprise infrastructure. This service acts as a proxy for Remote Desktop Protocol traffic, allowing users to connect to internal resources through firewalls and proxies securely. A successful exploitation that leads to denial of service can halt remote access capabilities for an entire organization, disrupting business continuity and potentially masking other malicious activities occurring on the network during the outage period. Attackers may leverage this instability as a distraction or as part of a broader campaign aimed at degrading organizational resilience.
Mitigation strategies must focus on both immediate remediation and long-term architectural improvements. The most effective solution is to apply vendor-provided security patches that address the memory management routines within the Remote Desktop Gateway Service, ensuring that all sensitive data buffers are properly locked using secure API calls and validated for integrity before use. Administrators should also implement network-level access controls such as firewalls or intrusion prevention systems to restrict direct interaction with the gateway service from untrusted networks until the patch is applied. Additionally, deploying monitoring solutions that detect abnormal memory usage patterns or unexpected crashes in the Remote Desktop Gateway process can help identify exploitation attempts early. Regular security audits focusing on secure coding practices for memory management will further reduce the risk of similar vulnerabilities arising in future updates to critical infrastructure components.