CVE-2025-34207 is a vulnerability identified in Vasion Print (formerly PrinterLogic) Virtual Appliance Host versions prior to 22.0.1049 and Application versions prior to 20.0.2786, affecting both Virtual Appliance (VA) and SaaS deployments. The root cause lies in the insecure SSH client configuration within Docker containers, where the SSH client is set with options: UserKnownHostsFile=/dev/null, StrictHostKeyChecking=no, and ForwardAgent yes. These settings disable verification of the remote host’s SSH key, effectively bypassing SSH host authenticity checks, and enable automatic forwarding of the developer’s SSH agent to any host matching configured wildcard patterns. An attacker who gains access to a single compromised container can manipulate the container to connect to a malicious SSH server. This malicious server can then capture the forwarded private SSH keys from the agent, which are typically used for authentication to other systems. With these keys, the attacker can move laterally across the network without further authentication, compromising additional hosts and potentially escalating privileges. The vulnerability is classified under CWE-522 (Insufficiently Protected Credentials) and CWE-306 (Missing Authentication for Critical Function), highlighting the failure to protect sensitive credentials and enforce authentication controls. The CVSS v4.0 base score is 7.9 (high), reflecting the network attack vector, low attack complexity, no privileges or user interaction required, and high scope impact due to lateral movement potential. Although no public exploits have been reported yet, the vulnerability’s nature makes it a critical concern for environments using Vasion Print appliances, especially those employing containerized deployments and SSH agent forwarding.

For European organizations, this vulnerability poses a significant risk to the confidentiality and integrity of internal systems. The ability for an attacker to capture forwarded SSH keys and move laterally without authentication can lead to widespread compromise of critical infrastructure, including print management systems and connected enterprise resources. This can result in data breaches, disruption of printing services, and potential escalation to more sensitive systems. Organizations in sectors such as government, finance, healthcare, and manufacturing—where print management solutions are integral—may face operational disruptions and regulatory compliance issues under GDPR if sensitive data is exposed. The vulnerability’s exploitation could also facilitate persistent access for threat actors, increasing the risk of espionage or sabotage. Given the high connectivity of European networks and the common use of containerized applications, the scope of impact can be broad, affecting multi-national corporations and public sector entities alike.

To mitigate CVE-2025-34207, organizations should immediately upgrade Vasion Print Virtual Appliance Host to version 22.0.1049 or later and the Application to version 20.0.2786 or later once patches are available. Until patches are applied, disable SSH agent forwarding within Docker containers and enforce strict SSH host key verification by removing or overriding the insecure SSH client options (UserKnownHostsFile=/dev/null and StrictHostKeyChecking=no). Network segmentation should be implemented to isolate containerized environments from critical systems, limiting lateral movement opportunities. Employ monitoring and alerting on unusual SSH connections and agent forwarding activities, including detection of connections to unknown SSH servers. Conduct regular audits of SSH keys and agent usage to identify unauthorized forwarding. Additionally, restrict access to container management interfaces and enforce least privilege principles for container users. Organizations should also consider deploying host-based intrusion detection systems (HIDS) and endpoint detection and response (EDR) solutions to detect anomalous lateral movement behaviors. Finally, educate developers and administrators on secure SSH configuration best practices to prevent recurrence.