CVE-2025-34414 is a critical vulnerability affecting Entrust Corporation's Instant Financial Issuance (IFI) On Premise software, specifically versions 5.x and 6.0 prior to 6.10.5 and 6.11.1. The root cause is an insecure configuration of the Legacy Remoting Service, which uses .NET Remoting technology to expose TCP remoting channels with SOAP and binary formatters set at TypeFilterLevel=Full. This setting allows deserialization of untrusted data, a well-known security risk classified under CWE-502. The remoting service is enabled by default and exposes default ObjectURI endpoints without authentication, allowing any remote attacker who can reach the remoting port to invoke exposed remoting objects. Exploitation enables attackers to read arbitrary files from the server, coerce outbound authentication mechanisms, and potentially write arbitrary files or execute remote code through known .NET Remoting exploitation techniques. This leads to a full compromise of the affected host, including disclosure of sensitive installation details and service account credentials. The vulnerability does not require authentication or user interaction and can be exploited remotely over the network, making it highly dangerous. Although no exploits are currently known in the wild, the CVSS 4.0 score of 9.3 (critical) reflects the high impact on confidentiality, integrity, and availability. The vulnerability also relates to CWE-306 (missing authentication for critical function), highlighting the lack of access controls on the remoting service. The affected product is commonly used in financial services environments for card issuance and financial credential management, increasing the risk profile for organizations handling sensitive financial data.

The impact of CVE-2025-34414 on European organizations is severe, especially those in the financial sector using Entrust IFI On Premise software. Successful exploitation can lead to full system compromise, including unauthorized disclosure of sensitive financial data, service account credentials, and installation configurations. This can facilitate further lateral movement, data exfiltration, and persistent access within the victim network. The ability to execute arbitrary code remotely without authentication significantly increases the risk of ransomware deployment, sabotage, or espionage. Given the critical role of Entrust IFI in financial credential issuance, disruption or compromise could undermine trust in financial transactions and regulatory compliance. European organizations face potential regulatory penalties under GDPR if personal data is exposed. The financial sector’s critical infrastructure status in many European countries also raises national security concerns. The vulnerability’s ease of exploitation and lack of authentication requirements make it a high priority for remediation to prevent potentially devastating operational and reputational damage.

1. Immediately upgrade Entrust IFI On Premise software to version 6.10.5 or later, or 6.11.1 or later, where the vulnerability is patched. 2. If patching is not immediately possible, disable the Legacy Remoting Service or restrict access to the remoting TCP port at the network perimeter using firewalls or network segmentation to allow only trusted management hosts. 3. Implement strict network access controls and monitoring on the remoting port to detect and block unauthorized connection attempts. 4. Review and harden .NET Remoting configurations by setting TypeFilterLevel to a safer level or migrating away from .NET Remoting to more secure communication protocols. 5. Conduct thorough audits of affected systems for signs of compromise, including unusual file writes, authentication anomalies, or unexpected remote code execution. 6. Employ endpoint detection and response (EDR) tools to detect exploitation attempts and anomalous behaviors. 7. Educate IT and security teams about the risks of deserialization vulnerabilities and the importance of secure configuration management. 8. Maintain up-to-date backups and incident response plans tailored to financial services environments to mitigate impact in case of exploitation.