The vulnerability (CVE-2026-67245) in ADM VPN Clients arises because the certificate name input, controlled by the user, is not properly validated before being used to construct the file upload destination path. This allows an authenticated attacker to perform path traversal and write files outside the designated VPN certificate directory, subject to the permissions of the process and filesystem. The affected versions include ADM 4.1.0 through 4.3.3.RUN1 and ADM 5.0.0 through 5.1.3.RI81. There is no indication of known exploits in the wild or available patches at this time.

An authenticated attacker can exploit this vulnerability to write files outside the intended directory, potentially leading to unauthorized file creation or modification on the system. The impact depends on the privileges of the process and filesystem permissions, which could result in system compromise or disruption of VPN client operations.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, restrict access to the VPN Clients to trusted users only and monitor for suspicious activity related to certificate uploads.