CVE-2025-12286 identifies an unquoted search path vulnerability in the AVService component of VeePN versions 1.6.0 through 1.6.2. Specifically, the issue lies in the handling of the executable path for avservice.exe located at C:\Program Files (x86)\VeePN\avservice\avservice.exe. When Windows attempts to execute this service, it searches for executables along the path without properly quoting directory names containing spaces. This can allow an attacker with local access and limited privileges to place a malicious executable in a directory earlier in the search path, causing Windows to execute the attacker's code with the service's privileges. The vulnerability requires local access and a high degree of complexity to exploit, as the attacker must have the ability to write to specific directories in the search path and understand the service's execution context. The CVSS 4.0 score is 7.3 (high), reflecting the significant impact on confidentiality, integrity, and availability if exploited, but mitigated by the difficulty and local access requirement. No user interaction is needed, and the vulnerability does not affect system components beyond the service executable. The vendor has not issued patches or responded to disclosure, and no known exploits have been observed in the wild. This vulnerability is a classic example of unquoted service path issues that can lead to privilege escalation on Windows systems.

If exploited, this vulnerability could allow an attacker with local access to escalate privileges by executing arbitrary code with the permissions of the AVService. This could lead to unauthorized access to sensitive data, modification or deletion of files, installation of persistent malware, or disruption of VPN service functionality. Organizations relying on VeePN for secure communications may face confidentiality breaches or service interruptions. Although exploitation is difficult and requires local access, insider threats or compromised accounts could leverage this vulnerability to gain higher privileges. The lack of vendor response and patches increases the risk exposure duration. The impact is particularly critical in environments where VeePN is deployed on endpoints with sensitive data or in regulated industries requiring strong security controls.

Since no official patch is available, organizations should implement the following mitigations: 1) Restrict local user permissions to prevent unauthorized write access to directories in the service's search path, especially those preceding the service executable path. 2) Manually inspect and correct the service executable path by quoting the full path in the Windows service configuration to prevent unquoted search path exploitation. 3) Employ application whitelisting and endpoint protection solutions to detect and block unauthorized executable files in critical directories. 4) Monitor for unusual local file creation or modifications in the VeePN installation directories. 5) Limit local administrative privileges and enforce the principle of least privilege to reduce the attack surface. 6) Consider temporarily disabling or uninstalling VeePN on systems where the risk outweighs the benefit until a vendor patch is released. 7) Maintain robust audit logging to detect potential exploitation attempts. These steps go beyond generic advice by focusing on path correction and strict local permission controls specific to this vulnerability.