CVE-2025-41366: IDF/ZLF CORS Privilege Escalation Flaw

CVE-2025-41366 Overview

CVE-2025-41366 is a Cross-Origin Resource Sharing (CORS) misconfiguration affecting ZIV IDF version v0.10.0-0C03-03 and ZLF version v0.10.0-0C03-04. The vulnerability is classified under [CWE-942] (Permissive Cross-domain Policy with Untrusted Domains). Exploitation requires an authenticated attacker with elevated permissions above the standard view role. The flaw enables cross-origin requests that the device should otherwise reject, weakening browser-enforced same-origin protections on the affected industrial devices.

Critical Impact
An authenticated attacker holding higher-than-view privileges can leverage a permissive CORS policy to issue cross-origin requests against the device, potentially affecting integrity and availability of configuration operations.

Affected Products

ZIV IDF firmware version v0.10.0-0C03-03
ZIV ZLF firmware version v0.10.0-0C03-04
Industrial protection and control equipment exposing the affected web management interface

Discovery Timeline

2025-06-06 - CVE-2025-41366 published to the National Vulnerability Database (NVD)
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-41366

Vulnerability Analysis

The vulnerability stems from a permissive CORS configuration in the web management interface of ZIV IDF and ZLF devices. CORS is a browser-enforced mechanism that controls which external origins may interact with a web resource. When misconfigured, the browser will accept responses from arbitrary origins, allowing attacker-controlled web pages to interact with the device on behalf of an authenticated user session.

Because the affected endpoints require permissions above the view role, exploitation depends on an attacker abusing an active session held by a privileged operator. A privileged user visiting an attacker-controlled page could trigger unintended state-changing commands against the device without their knowledge.

The scope is limited to functionality that requires elevated permissions, which constrains the immediate blast radius but still covers operations meaningful to device configuration and integrity.

Root Cause

The root cause is an improperly restricted cross-origin policy in the device firmware, matching [CWE-942]. The affected implementation does not sufficiently validate the Origin request header against an allowlist, causing the device to return CORS response headers that authorize untrusted origins to read responses or issue credentialed cross-origin requests.

Attack Vector

The attack vector is network-based and requires prior authentication with elevated privileges. A typical exploitation path involves an attacker hosting a malicious web page that issues cross-origin requests to the target device. If a privileged operator visits the page while authenticated to the device, the browser attaches session credentials and the permissive CORS policy allows the response to be read or the request to be processed.

Exploitation code is not publicly available and no in-the-wild exploitation has been reported. For further technical detail, refer to the INCIBE Security Notice on Vulnerabilities.

Detection Methods for CVE-2025-41366

Indicators of Compromise

Unexpected Origin headers in HTTP requests to the device management interface originating from external or unknown domains
Successful state-changing operations correlated with browser referrers pointing to non-corporate web assets
Anomalous configuration changes performed by privileged accounts outside of scheduled maintenance windows

Detection Strategies

Inspect HTTP response headers from the device for wildcard Access-Control-Allow-Origin: * values combined with Access-Control-Allow-Credentials: true
Correlate authenticated session activity with the source Referer and Origin headers to identify cross-origin requests from untrusted domains
Deploy network monitoring to alert on management-plane requests initiated from workstation browsers rather than approved engineering tools

Monitoring Recommendations

Log all administrative actions on IDF and ZLF devices with source IP, user account, and originating referrer where available
Alert on privileged account activity that deviates from established operator baselines
Forward device audit logs to a centralized SIEM for cross-source correlation with endpoint browsing telemetry

How to Mitigate CVE-2025-41366

Immediate Actions Required

Restrict network access to the device management interface to trusted engineering workstations and jump hosts only
Enforce least privilege on device accounts and limit the number of users holding permissions above the view role
Require privileged operators to use dedicated, hardened browsers or workstations that do not browse the general internet
Review the INCIBE Security Notice on Vulnerabilities for vendor guidance

Patch Information

The NVD entry does not list a specific fixed firmware build at time of publication. Operators should contact ZIV directly for a firmware update addressing the CORS configuration on IDF v0.10.0-0C03-03 and ZLF v0.10.0-0C03-04, and consult the INCIBE advisory for the latest vendor coordination status.

Workarounds

Segment the operational technology network so the device management interface is not routable from user workstation subnets
Terminate privileged device sessions immediately after configuration tasks are complete to shrink the window of exploitation
Deploy a reverse proxy in front of the device that enforces a strict Access-Control-Allow-Origin allowlist and validates the Origin header on state-changing requests

bash

# Example nginx reverse proxy snippet enforcing a strict CORS allowlist
location / {
    if ($http_origin !~ ^https://ops\.example\.local$) {
        return 403;
    }
    add_header Access-Control-Allow-Origin $http_origin always;
    add_header Access-Control-Allow-Credentials true always;
    add_header Vary Origin always;
    proxy_pass https://ziv-device.internal;
}