CVE-2025-50125: Server-Side Request Forgery RCE Flaw

CVE-2025-50125 Overview

CVE-2025-50125 is a Server-Side Request Forgery (SSRF) vulnerability tracked under CWE-918. The flaw can lead to unauthenticated remote code execution when an attacker accesses the affected server across the network. Exploitation requires knowledge of hidden URLs and the ability to manipulate the HTTP Host request header.

Schneider Electric disclosed the issue in security notice SEVD-2025-189-01, and additional technical context appears in a Full Disclosure mailing list post. The vulnerability affects networked services and does not require authentication to reach the vulnerable code path.

Critical Impact
Unauthenticated remote attackers with network reach and knowledge of internal URLs can coerce the server into performing arbitrary requests, potentially achieving remote code execution.

Affected Products

Schneider Electric product per advisory SEVD-2025-189-01
Specific product and version list: refer to the vendor advisory
Deployments exposing the affected web server to untrusted networks

Discovery Timeline

2025-07-11 - CVE-2025-50125 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-50125

Vulnerability Analysis

The vulnerability is a Server-Side Request Forgery weakness classified as [CWE-918]. The server processes requests to hidden or non-advertised URLs without validating or restricting the destination of the resulting internal request. By manipulating the HTTP Host header, an attacker redirects server-side request routing to an attacker-controlled or unintended destination.

Because the entry point does not require authentication, any actor with network access to the exposed service can trigger the flawed request handling. The advisory indicates that chained conditions elevate the SSRF into unauthenticated remote code execution. The scope of impact therefore extends beyond information disclosure to full compromise of the process handling the request.

Root Cause

The root cause is insufficient validation of user-controllable input used to construct server-initiated requests. The Host header is trusted for routing decisions instead of a fixed allow-list of internal endpoints. When combined with knowledge of undocumented URLs, this trust boundary failure lets an attacker steer internal calls to attacker-chosen targets.

Attack Vector

Exploitation is remote over the network with low attack complexity. The attacker sends a crafted HTTP request to a hidden URL and supplies a manipulated Host header. The server then issues an internal request based on that header, which the attacker leverages to reach protected functionality and, per the advisory, execute code without authentication. Refer to the Schneider Electric advisory for technical specifics; no verified proof-of-concept code has been published.

Detection Methods for CVE-2025-50125

Indicators of Compromise

HTTP requests to undocumented or hidden URL paths from external sources
Requests containing anomalous or mismatched Host header values that do not correspond to configured virtual hosts
Outbound connections initiated by the affected server to unusual internal or external destinations following inbound HTTP traffic
New or unexpected child processes spawned by the web server process after receiving crafted requests

Detection Strategies

Inspect web server and reverse-proxy logs for Host header values that deviate from the expected allow-list
Correlate inbound HTTP requests to hidden endpoints with subsequent outbound network activity from the same process
Deploy signatures on web application firewalls to flag SSRF patterns targeting internal IP ranges, loopback addresses, and cloud metadata endpoints

Monitoring Recommendations

Enable verbose access logging including full request headers on the affected Schneider Electric service
Alert on process creation events under the web server user account, particularly shell interpreters or scripting binaries
Baseline outbound network flows from the server and alert on deviations to unexpected destinations

How to Mitigate CVE-2025-50125

Immediate Actions Required

Apply the remediation described in Schneider Electric advisory SEVD-2025-189-01 as soon as it is available for your deployment
Restrict network access to the affected service so it is not reachable from untrusted networks
Enforce strict Host header validation at an upstream reverse proxy or WAF
Audit recent logs for signs of exploitation before and after patching

Patch Information

Refer to Schneider Electric security notice SEVD-2025-189-01 for the authoritative list of fixed versions, affected products, and vendor remediation guidance. Follow Schneider Electric's staged update procedures for operational technology deployments to avoid disruption.

Workarounds

Place the affected service behind a reverse proxy that enforces a strict allow-list of Host header values
Block or drop inbound requests to undocumented URL paths at the network perimeter
Segment the server on a restricted network so that any SSRF-induced outbound request cannot reach sensitive internal targets
Apply egress filtering to prevent the server from initiating connections to internal metadata services or unrelated internal subnets

bash

# Example nginx snippet to enforce Host header allow-list
server {
    listen 443 ssl;
    server_name device.example.local;

    if ($host !~* ^(device\.example\.local)$) {
        return 421;
    }

    location / {
        proxy_pass http://schneider_backend;
        proxy_set_header Host $host;
    }
}