Overview
CVE-2025-7390 is a critical security vulnerability affecting OPC.HTTPS servers. This vulnerability allows a malicious client to bypass the client certificate trust check when the server endpoint is configured to allow only secure communication. Given the potential for system compromise or data leakage, it is of utmost importance to be aware of this vulnerability and take the necessary steps for mitigation.
This vulnerability exposes a large number of systems and applications, particularly those that rely on OPC.HTTPS servers for secure communication. The implications of a successful exploit include potential system compromise and data leakage. The severity of this exploit makes it a high priority for systems administrators, network security experts, and other cybersecurity stakeholders.
Vulnerability Summary
CVE ID: CVE-2025-7390
Severity: Critical – CVSS Score 9.1
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: System compromise and potential data leakage
Affected Products
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Product | Affected Versions
OPC.HTTPS Server | All versions prior to patch
How the Exploit Works
The exploit works by a malicious client sending specially crafted requests to the OPC.HTTPS server. Due to an error in the server’s certificate trust check mechanism, these requests can bypass the security checks that are supposed to ensure that only trusted clients can establish secure communication. This allows the attacker to gain unauthorized access to the server and potentially compromise the system or leak data.
Conceptual Example Code
This is a conceptual example of how the vulnerability might be exploited.
POST /secure/endpoint HTTP/1.1
Host: target.example.com
Content-Type: application/json
Certificate: Malicious_Certificate
{ "malicious_payload": "Exploit_Code_Here" }In this example, the malicious client sends a request to a secure endpoint on the target server. The request includes a certificate that is not trusted by the server. However, due to the vulnerability, the server allows the request and processes the malicious payload enclosed within it.
Mitigation
The best mitigation strategy for this vulnerability is to apply the vendor-provided patch. If the patch is not yet available or cannot be applied immediately, using a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can provide temporary mitigation. These systems can be configured to block or alert on suspicious requests, potentially preventing exploitation of this vulnerability.