CVE-2025-9161 in FactoryTalk Optix
Summary
by MITRE • 09/09/2025
A security issue exists within FactoryTalk Optix MQTT broker due to the lack of URI sanitization. This flaw enables the loading of remote Mosquito plugins, which can be used to achieve remote code execution.
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Analysis
by VulDB Data Team • 10/21/2025
The FactoryTalk Optix MQTT broker represents a critical security vulnerability classified as CVE-2025-9161, which stems from insufficient URI sanitization mechanisms within the system architecture. This weakness creates an exploitable pathway that allows unauthorized remote loading of Mosquito plugins, fundamentally compromising the security posture of industrial automation environments. The vulnerability specifically targets the message broker component that facilitates communication between industrial devices and control systems, making it particularly dangerous in operational technology contexts where system integrity and availability are paramount.
The technical flaw manifests through the absence of proper input validation and sanitization of Uniform Resource Identifiers within the MQTT broker implementation. When remote entities attempt to load plugins through URI references, the system fails to properly validate or sanitize these inputs, allowing malicious actors to inject arbitrary plugin references that can be executed within the broker environment. This vulnerability aligns with CWE-20, which describes improper input validation, and represents a classic example of a path traversal or code injection vulnerability that can be leveraged for privilege escalation and system compromise. The lack of URI sanitization creates a direct attack vector that bypasses normal security controls and authentication mechanisms.
The operational impact of this vulnerability extends far beyond simple remote code execution, as it fundamentally undermines the security model of industrial control systems that rely on FactoryTalk Optix for critical infrastructure monitoring and management. Attackers can leverage this flaw to gain unauthorized access to industrial networks, potentially disrupting production processes, accessing sensitive operational data, or even causing physical damage to equipment through malicious plugin execution. The remote nature of the attack means that threat actors can exploit this vulnerability from external networks without requiring physical access or insider knowledge, making it particularly dangerous in environments where industrial systems are connected to corporate networks or the internet. This vulnerability directly impacts the CIA triad, compromising confidentiality, integrity, and availability of industrial control systems.
Mitigation strategies for CVE-2025-9161 should prioritize immediate patching and configuration hardening measures to address the URI sanitization deficiency. Organizations must implement strict input validation controls that sanitize all URI references before processing, ensuring that only legitimate plugin sources are accepted. Network segmentation and firewall rules should be enforced to restrict access to MQTT broker components, limiting exposure to trusted networks only. The implementation of principle of least privilege access controls and regular security audits can help detect unauthorized plugin loading attempts. Additionally, monitoring systems should be configured to detect unusual plugin loading patterns and anomalous network traffic that may indicate exploitation attempts. Security professionals should reference ATT&CK technique T1059.007 for remote code execution via broker components and consider implementing network detection and response solutions to identify potential exploitation activities. Organizations should also conduct comprehensive vulnerability assessments of their industrial control system environments to identify similar sanitization weaknesses in other components that may be susceptible to similar attacks.