CVE-2026-105723 in Windows
Summary
by MITRE • 10/14/2026
Untrusted pointer dereference in Windows Distributed File System (DFS) allows an unauthorized attacker to elevate privileges over a network.
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Analysis
by VulDB Data Team • 10/14/2026
The vulnerability described involves an untrusted pointer dereception within the Microsoft Windows Distributed File Service, specifically affecting components responsible for handling remote file system operations. This flaw arises from insufficient validation of pointers passed by clients during DFS protocol interactions. When a client initiates a connection or requests specific metadata regarding shared resources, the server-side processing logic fails to adequately verify that memory addresses referenced in these requests are valid and accessible within the expected security context. An attacker who can communicate with the vulnerable system over the network can craft maliciously formatted packets containing invalid or controlled pointer values. Upon receiving such data, the DFS service attempts to dereference these pointers without proper bounds checking or privilege verification, leading to a memory corruption state that disrupts normal execution flow and allows for arbitrary code execution under the context of the local security authority.
From a technical perspective, this issue is classified as CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer, specifically manifesting through improper pointer validation which often leads to buffer overflows or use-after-free conditions depending on the specific implementation details and memory layout at runtime. The exploitation vector requires network access, meaning it falls under ATT&CK technique T1210 Exploitation of Remote Services. Because the vulnerability resides in a core system service that typically runs with high privileges, successful exploitation grants an attacker significant control over the affected host. This capability enables privilege escalation from a standard user account or even unauthenticated network access to SYSTEM-level permissions, effectively compromising the integrity and confidentiality of all data stored on the machine.
The operational impact is severe as it allows for complete system compromise without requiring physical access or prior authentication in some configurations. Attackers can install malware, create new administrative accounts, exfiltrate sensitive information, or pivot further into internal networks using the compromised host as a foothold. Given that Distributed File System services are commonly deployed across enterprise environments to facilitate file sharing and storage management, this vulnerability poses a widespread risk to organizations relying on Windows infrastructure for critical data operations. The ability to escalate privileges remotely makes it particularly dangerous in mixed-environment setups where lateral movement is facilitated by shared resources.
Mitigation strategies primarily involve applying the relevant security updates provided by Microsoft that address the input validation logic within the DFS service components. Organizations should prioritize patching systems exposed to untrusted networks or those hosting public-facing file shares until patches are verified and deployed. Additionally, network segmentation can help limit exposure by restricting access to DFS services only from trusted subnets where authorized clients reside. Implementing strict firewall rules that block unnecessary inbound traffic to ports associated with SMB and DFS protocols reduces the attack surface significantly. Security teams should also monitor for anomalous behavior indicative of exploitation attempts, such as unusual memory allocation patterns or unexpected privilege changes on hosts running vulnerable versions of Windows. Regular vulnerability scanning focused on unpatched systems remains essential for maintaining a secure posture against this class of remote code execution flaws.