CVE-2025-41684: Web Interface RCE Vulnerability

CVE-2025-41684 Overview

CVE-2025-41684 is an authenticated OS command injection vulnerability [CWE-78] affecting the Main Web Interface of an industrial IoT device. The flaw resides in the tls_iotgen_setting endpoint, which fails to sanitize user-supplied input before passing it to a system shell. An authenticated remote attacker can inject arbitrary operating system commands and execute them with root privileges. The vulnerability was published by CERT@VDE under advisory VDE-2025-052 and impacts confidentiality, integrity, and availability of affected devices.

Critical Impact
Authenticated attackers can achieve full root-level command execution on affected devices through the tls_iotgen_setting web endpoint, enabling complete device takeover.

Affected Products

Devices referenced in CERT@VDE advisory VDE-2025-052
Main Web Interface exposing the tls_iotgen_setting endpoint
Specific vendor and product details: refer to the CERT@VDE Advisory VDE-2025-052

Discovery Timeline

2025-07-23 - CVE-2025-41684 published to NVD
2026-04-15 - Last updated in NVD database

Technical Details for CVE-2025-41684

Vulnerability Analysis

The vulnerability is a classic OS command injection flaw classified under [CWE-78]. The tls_iotgen_setting endpoint in the Main Web Interface accepts parameters from authenticated users and incorporates them into a shell command without proper validation, escaping, or use of safe execution APIs. Because the web service runs as root on the affected embedded device, any injected command inherits root privileges.

Exploitation requires valid credentials, but the attack complexity is low and no user interaction is needed. The EPSS score of 0.906% (76.1 percentile) indicates measurable exploitation likelihood relative to other CVEs.

Root Cause

The root cause is missing input sanitization in the handler for the tls_iotgen_setting endpoint. User-controlled parameters are concatenated into a string that is passed to a shell interpreter, typically through calls such as system(), popen(), or exec() with /bin/sh -c. Shell metacharacters including ;, |, &, $(), and backticks are not filtered or escaped, allowing attackers to terminate the intended command and append arbitrary instructions.

Attack Vector

The attack is delivered over the network against the device's Main Web Interface. An attacker authenticates with valid credentials, then submits a crafted HTTP request to the tls_iotgen_setting endpoint. The injected payload is interpreted by the underlying shell and executed as root. Successful exploitation enables credential theft, firmware modification, lateral movement, and persistent backdoor installation. The vulnerability mechanism is documented in the CERT@VDE Advisory VDE-2025-052.

Detection Methods for CVE-2025-41684

Indicators of Compromise

HTTP POST or GET requests to the tls_iotgen_setting endpoint containing shell metacharacters such as ;, |, &&, $(, or backticks in parameter values.
Unexpected child processes spawned by the device's web server process, particularly sh, bash, wget, curl, nc, or busybox utilities.
Outbound network connections from the device to unfamiliar hosts following authenticated web sessions.

Detection Strategies

Inspect web server access logs for requests to tls_iotgen_setting containing URL-encoded shell metacharacters (%3B, %7C, %26, %24%28).
Deploy network intrusion detection signatures that flag command injection patterns in HTTP traffic targeting the device management interface.
Correlate authenticated administrative sessions with anomalous process execution telemetry from the device, where available.

Monitoring Recommendations

Forward device syslog and web access logs to a centralized SIEM for retention and correlation across the IoT estate.
Alert on any successful authentication to the Main Web Interface from non-management network segments.
Monitor for new outbound connections originating from IoT devices to external IP addresses or non-corporate infrastructure.

How to Mitigate CVE-2025-41684

Immediate Actions Required

Apply the vendor-supplied firmware update referenced in CERT@VDE Advisory VDE-2025-052 as soon as it is available.
Restrict network access to the Main Web Interface so it is reachable only from trusted management networks or via VPN.
Rotate all administrative credentials used to authenticate to affected devices and enforce strong, unique passwords.

Patch Information

Refer to the CERT@VDE Advisory VDE-2025-052 for the authoritative list of affected firmware versions and patched releases. Organizations operating these devices should subscribe to vendor security notifications and validate firmware integrity after updates.

Workarounds

Place affected devices behind a firewall and permit access to the management interface only from a dedicated administration VLAN.
Disable remote access to the Main Web Interface if the tls_iotgen_setting functionality is not required for operations.
Implement role-based access control to limit which authenticated users can reach configuration endpoints, reducing the pool of accounts that could be abused for exploitation.

bash

# Example firewall rule restricting management interface access to a trusted subnet
iptables -A INPUT -p tcp --dport 443 -s 10.10.20.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -j DROP