CVE-2025-11534 is an authentication bypass vulnerability classified under CWE-288 affecting Raisecomm's RAX701-GC-WP-01 device with firmware version 5.5.27_20190111. The vulnerability allows attackers to establish SSH sessions without completing user authentication, effectively granting unauthorized shell access. This occurs because the device's SSH implementation accepts connections via an alternate path or channel that bypasses the normal authentication mechanisms. Exploitation requires no privileges, no user interaction, and can be performed remotely over the network, making it highly accessible to attackers. The vulnerability impacts confidentiality by exposing sensitive device configurations and data, integrity by allowing unauthorized command execution, and availability by potentially enabling disruptive actions. The CVSS v4.0 score of 9.3 reflects these severe impacts with network attack vector, no required privileges or user interaction, and high impact on all security properties. Although no public exploits are reported yet, the critical nature of the flaw demands urgent attention. The affected product is commonly used in telecommunications and industrial network environments, where device compromise can have cascading effects on network stability and security. The lack of available patches at the time of disclosure increases the urgency for interim mitigations such as network segmentation and access controls.

For European organizations, this vulnerability poses a critical risk to network infrastructure, particularly in sectors relying on Raisecomm devices such as telecommunications providers, industrial control systems, and critical infrastructure operators. Unauthorized SSH access can lead to full device compromise, enabling attackers to manipulate network traffic, disrupt services, or pivot to other internal systems. Confidential data stored or transmitted through these devices could be exposed, and integrity of network operations compromised. The availability of critical network functions may be impacted, causing service outages or degraded performance. Given the strategic importance of telecommunications and industrial networks in Europe, exploitation could have significant operational and economic consequences. The absence of known exploits currently provides a window for proactive defense, but the ease of exploitation and critical severity necessitate immediate action to prevent potential attacks.

1. Immediately identify and inventory all Raisecomm RAX701-GC-WP-01 devices running the vulnerable firmware version 5.5.27_20190111 within the network. 2. Apply vendor-provided patches or firmware updates as soon as they become available to address the authentication bypass. 3. Until patches are available, restrict SSH access to these devices using network segmentation and firewall rules, allowing only trusted management hosts to connect. 4. Implement strict network access controls and monitoring to detect unauthorized SSH connection attempts to Raisecomm devices. 5. Employ intrusion detection/prevention systems (IDS/IPS) with signatures or heuristics targeting anomalous SSH session establishment patterns. 6. Regularly audit device configurations and logs for signs of unauthorized access or suspicious activity. 7. Consider deploying multi-factor authentication (MFA) on management interfaces if supported by the device to add an additional security layer. 8. Engage with Raisecomm support channels to obtain timely security advisories and updates. 9. Educate network administrators about the vulnerability and enforce strict operational security practices around device management.