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high advisory

CVE-2025-41669 - PLCnext Control Arbitrary Code Execution via Unverified App Installation

CVE-2025-41669 allows a remote, low-privileged engineer user to install additional, potentially malicious, applications on the PLCnext Control device without data verification, leading to arbitrary code execution with root privileges and impacting system integrity and availability.

CVE-2025-41669 exposes a critical vulnerability in the web-based management interface of the PLCnext Control system. A remote, low-privileged user with engineer credentials can install applications downloaded from the PLCnext Store onto the device without any form of data verification. This lack of verification allows an attacker to upload and install a manipulated application package. Successful exploitation results in arbitrary code execution with root privileges on the PLC device. This poses a significant risk to the integrity and availability of the PLCnext Control system, which is often used in industrial automation settings.

Attack Chain

  1. Attacker gains low-privileged Engineer access to the PLCnext Control web-based management interface.
  2. Attacker navigates to the application installation section of the web interface.
  3. Attacker prepares a malicious application package designed for the PLCnext platform.
  4. Attacker uploads the malicious application package to the PLCnext Control device via the web interface.
  5. Due to the lack of data verification, the PLCnext Control system installs the malicious application.
  6. The malicious application executes with root privileges on the PLCnext Control device.
  7. Attacker gains full control over the PLCnext Control device.
  8. Attacker disrupts industrial processes or exfiltrates sensitive data.

Impact

Successful exploitation of CVE-2025-41669 grants an attacker complete control over the PLCnext Control device. This can lead to significant disruption of industrial processes, data breaches, and potential physical damage depending on the connected systems. The lack of verification on application installations makes the system highly vulnerable to malicious actors with even limited access.

Recommendation

  • Monitor web server logs for unusual activity related to application installation endpoints to detect potential exploit attempts against CVE-2025-41669.
  • Deploy the Sigma rule “Detect CVE-2025-41669 Exploitation Attempt via Malicious App Upload” to identify suspicious application uploads via the web interface.
  • Implement strict access control policies to limit the number of users with Engineer privileges on PLCnext Control systems.
  • Refer to CERT VDE advisory VDE-2026-050 for additional mitigation guidance and vendor-supplied patches.

Detection coverage 2

Detect CVE-2025-41669 Exploitation Attempt via Malicious App Upload

high

Detects CVE-2025-41669 exploitation attempt by monitoring web server logs for suspicious POST requests to application installation endpoints with unusually large request bodies, indicative of malicious app uploads.

sigma tactics: initial_access techniques: T1189 sources: webserver

Detect CVE-2025-41669 Post Exploitation - Suspicious Root Privileges

medium

Detects CVE-2025-41669 post exploitation — execution of suspicious commands or processes as root after potential exploitation.

sigma tactics: privilege_escalation techniques: T1068 sources: process_creation, linux

Detection queries are available on the platform. Get full rules →