CVE-2025-7390CWE-295

Bypass the client certificate trust check of an opc.https server while only secure communication is allowed

Critical · published August 21, 2025

CVSS v3.1
9.1
EPSS
0%
Percentile
16.3
In the wild
Unconfirmed
What it is

🚨 A crafty client can completely bypass trust checks on an OPC HTTPS server designed for secure communication! 🔥 Think of it like a restaurant that only allows entry to diners with reservations. If someone sneaks in using a fake reservation, they could access the kitchen and cause all sorts of chaos before anyone realizes something’s wrong! This vulnerability could lead to unauthorized access, allowing an attacker to execute harmful actions under the guise of a trusted client. Imagine them waltzing into sensitive areas, stealing data, or even tampering with critical operations—absolutely devastating!

Put simply

Think of it like a restaurant that only allows entry to diners with reservations. If someone sneaks in using a fake reservation, they could access the kitchen and cause all sorts of chaos before anyone realizes something’s wrong! CVE-2025-7390 allows a malicious client to bypass the client certificate trust check on an OPC HTTPS server, compromising secure communication by accepting invalid or spoofed certificates.

What to do

This vulnerability could lead to unauthorized access, allowing an attacker to execute harmful actions under the guise of a trusted client. Imagine them waltzing into sensitive areas, stealing data, or even tampering with critical operations—absolutely devastating! To mitigate this vulnerability, ensure that the server is configured correctly to enforce strict client certificate validation. Update to the patched version released by the vendor as soon as it's available, and conduct a thorough audit of your server configurations. You've got this! Follow these steps, and soon your server will be as secure as a fortress! 🛡️

The record
Technical detail
CVSS v3.1
9.1 · CRITICAL
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
CVSS v4.0
Not supplied
EPSS
0.00256 · 16.3th percentile
Weakness
CWE-295 · Improper Certificate Validation
Published
2025-08-21T06:08Z
EPSS history
Timeline
  • 21 AUG 06:08Z
    Bypass the client certificate trust check of an opc.https server while only secure communication is allowed
    cvelistv5