Summary
The Lenze VPN client is vulnerable to a Remote Code Execution. The vulnerability would allow an attacker to perform a remote code execution on the computer running the client with elevated privileges.
Impact
By exploiting this vulnerability, an attacker could completely compromise the system.
Affected Product(s)
| Model no. | Product name | Affected versions |
|---|---|---|
| Lenze VPN Client <1.4.7 | vers:semver/>=1.0.0|<1.4.7 |
Vulnerabilities
Expand / Collapse allImproper neutralization of CRLF sequences in IXON VPN Client before version 1.4.7 allows an attacker to execute commands as root or SYSTEM. Configuration values accepted by the local service are written to a file later consumed by a privileged subprocess, without line-ending sequences being neutralized, which allows additional directives to be introduced into that file. The configuration interface accepts changes without authenticating or verifying the origin of the requester. The injected configuration persists on disk across restarts of the client and the operating system, and the VPN connection continues to function normally, so there is no behavioral change visible to the user.
Mitigation
As the cloud environment blocks older versions of the Lenze VPN Client, you must update the Lenze VPN Client. If you attempt to connect to the VPN using an older version, an error message will appear stating: "A newer version of the VPN client is required."
Acknowledgments
Lenze SE thanks the following parties for their efforts:
- CERT@VDE for coordination (see https://certvde.com )
Revision History
| Version | Date | Summary |
|---|---|---|
| 1.0.0 | 09/21/2026 18:00 | initial revision |