CVE-2020-7568 in Modicon M221
Summary
by MITRE • 11/20/2020
A CWE-200: Exposure of Sensitive Information to an Unauthorized Actor vulnerability exists in Modicon M221 (all references, all versions) that could allow non sensitive information disclosure when the attacker has captured the traffic between EcoStruxure Machine - Basic software and Modicon M221 controller.
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Analysis
by VulDB Data Team • 05/30/2026
The vulnerability identified as CVE-2020-7568 represents a critical exposure of sensitive information through CWE-200 weakness in Modicon M221 controllers across all references and versions. This security flaw specifically affects the communication channel between EcoStruxure Machine - Basic software and the Modicon M221 controller, creating an avenue for unauthorized information disclosure. The vulnerability stems from inadequate protection of communication protocols during data transmission, allowing attackers who have intercepted network traffic to access information that should remain confidential within industrial control systems. This exposure directly violates fundamental security principles of information classification and access control in industrial environments.
The technical implementation of this vulnerability involves the lack of proper encryption or authentication mechanisms within the communication stack between the EcoStruxure Machine - Basic software and the Modicon M221 controller. When network traffic is captured through man-in-the-middle attacks or network sniffing operations, sensitive operational data becomes accessible to unauthorized parties. The flaw exists at the protocol level where information flows between industrial automation components without adequate confidentiality measures, making it particularly dangerous in environments where operational technology (OT) systems require robust security controls. This weakness aligns with ATT&CK technique T1041 for Exfiltration Over Command and Control Channel, where adversaries can leverage compromised communication channels to extract valuable information.
The operational impact of this vulnerability extends beyond simple information disclosure to potentially compromise the integrity and availability of industrial processes. Attackers who successfully exploit this vulnerability can gain insights into controller configurations, operational parameters, and potentially system architecture details that could facilitate more sophisticated attacks. The exposure affects all versions of Modicon M221 controllers, indicating a fundamental design flaw rather than a specific implementation bug. This widespread impact across all references means that organizations deploying these controllers face significant risk without proper mitigation measures. The vulnerability particularly affects industrial environments where Modicon M221 controllers are used in manufacturing, process control, and automation applications, where information confidentiality is paramount for operational security.
Mitigation strategies for CVE-2020-7568 should focus on implementing robust network security controls including encryption of communication channels between the EcoStruxure Machine - Basic software and Modicon M221 controllers. Organizations should deploy network segmentation to isolate critical industrial control systems from general network access and implement proper authentication mechanisms to ensure only authorized personnel can access controller information. The implementation of secure communication protocols such as TLS or other encryption standards should be mandatory for all inter-controller communications. Additionally, regular network monitoring and intrusion detection systems should be deployed to identify potential traffic interception attempts and unauthorized access patterns. Organizations should also consider upgrading to newer controller versions that address this vulnerability or implementing compensating controls such as secure network tunnels and encrypted communication channels to protect against unauthorized information disclosure.