{"id":2818,"date":"2025-10-07T09:19:44","date_gmt":"2025-10-07T09:19:44","guid":{"rendered":"https:\/\/inprotech.es\/?p=2818"},"modified":"2025-10-07T09:19:44","modified_gmt":"2025-10-07T09:19:44","slug":"mqtt-in-ot-environments-efficient-communication-and-emerging-threats","status":"publish","type":"post","link":"https:\/\/inprotech.es\/en\/mqtt-in-ot-environments-efficient-communication-and-emerging-threats\/","title":{"rendered":"MQTT in OT Environments: Efficient Communication and Emerging Threats"},"content":{"rendered":"<p><span style=\"font-weight: 400;\">In an <\/span><b>increasingly connected industrial world<\/b><span style=\"font-weight: 400;\">, <\/span><b>MQTT (Message Queuing Telemetry Transport)<\/b><span style=\"font-weight: 400;\"> has become one of the <\/span><b>leading protocols for communication<\/b><span style=\"font-weight: 400;\"> between <\/span><b>IIoT devices<\/b><span style=\"font-weight: 400;\">. Designed to be <\/span><b>lightweight, fast, and efficient<\/b><span style=\"font-weight: 400;\">, MQTT has gained ground over traditional protocols such as <\/span><b>Modbus TCP<\/b><span style=\"font-weight: 400;\"> or <\/span><b>OPC UA<\/b><span style=\"font-weight: 400;\"> in environments where <\/span><b>data collection must be constant, asynchronous, and scalable<\/b><span style=\"font-weight: 400;\">.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">However, this <\/span><b>flexibility comes at a cost<\/b><span style=\"font-weight: 400;\">: most MQTT implementations <\/span><b>lack default security mechanisms<\/b><span style=\"font-weight: 400;\">. This can turn it into an <\/span><b>attack vector<\/b><span style=\"font-weight: 400;\"> if an <\/span><b>adequate cybersecurity strategy<\/b><span style=\"font-weight: 400;\"> is not applied.<\/span><\/p>\n\n<h2><b>MQTT in Industrial Environments<\/b><\/h2>\n<p><b>MQTT<\/b><span style=\"font-weight: 400;\"> follows a <\/span><b>publish\/subscribe architecture<\/b><span style=\"font-weight: 400;\">, where <\/span><b>devices (clients) publish or subscribe to messages<\/b><span style=\"font-weight: 400;\"> identified by a <\/span><b>&#8216;topic&#8217;<\/b><span style=\"font-weight: 400;\">. A <\/span><b>central MQTT broker<\/b><span style=\"font-weight: 400;\"> manages the distribution of these messages among connected devices.<\/span><\/p>\n<p><b>Advantages for OT networks:<\/b><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Efficient and stateless communication<\/b><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Low bandwidth consumption<\/b><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Configurable QoS (quality of service) support<\/b><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Ideal for distributed sensors<\/b><span style=\"font-weight: 400;\">, <\/span><b>IIoT gateways<\/b><span style=\"font-weight: 400;\">, or <\/span><b>controllers<\/b><span style=\"font-weight: 400;\"> connected to <\/span><b>wireless or mobile networks<\/b><\/li>\n<\/ul>\n<h2><b>Typical Architecture and Use Cases<\/b><\/h2>\n<p><b>Common scenario in industrial plants:<\/b><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Sensors publish values<\/b><span style=\"font-weight: 400;\"> such as <\/span><b>plant1\/temperature\/zone3<\/b><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">A <\/span><b>SCADA<\/b><span style=\"font-weight: 400;\"> or <\/span><b>dashboard subscribes to those topics<\/b><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">An <\/span><b>internal broker distributes messages<\/b><span style=\"font-weight: 400;\">, even among <\/span><b>remote nodes or in the cloud<\/b><\/li>\n<\/ul>\n<p><b>Common uses:<\/b><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Environmental monitoring<\/b><span style=\"font-weight: 400;\"> (temperature, humidity, CO\u2082)<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Telemetry of mobile industrial assets<\/b><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Remote control of actuators<\/b><span style=\"font-weight: 400;\"> through topics such as <\/span><b>plant1\/valve1\/close<\/b><\/li>\n<\/ul>\n<h2><b>Risks and Attack Vectors<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">Although <\/span><b>MQTT can coexist stably in OT networks<\/b><span style=\"font-weight: 400;\">, most <\/span><b>industrial MQTT brokers and devices<\/b><span style=\"font-weight: 400;\"> are installed with <\/span><b>minimal security configuration<\/b><span style=\"font-weight: 400;\">. This implies <\/span><b>serious risks<\/b><span style=\"font-weight: 400;\">:<\/span><\/p>\n<p>&nbsp;<\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Public topics<\/b><span style=\"font-weight: 400;\"> allow attackers to <\/span><b>spy on the entire network<\/b><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>No authentication<\/b><span style=\"font-weight: 400;\"> allows <\/span><b>anonymous access<\/b><span style=\"font-weight: 400;\"> or <\/span><b>default passwords<\/b><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Unencrypted messages (without TLS)<\/b><span style=\"font-weight: 400;\"> make <\/span><b>data interception easier<\/b><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Command injection<\/b><span style=\"font-weight: 400;\"> through control topics can cause <\/span><b>unwanted actions<\/b><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Malicious persistence<\/b><span style=\"font-weight: 400;\"> via retained messages or high QoS can <\/span><b>prolong attacks<\/b><\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<h2><b>Simulation and Exploitation of MQTT<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">An attacker could subscribe to &#8216;#&#8217;, receive sensor data, and publish commands to critical topics, causing unauthorized shutdowns of equipment.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">In <\/span><b>controlled environments<\/b><span style=\"font-weight: 400;\">, it is possible to <\/span><b>simulate real attacks<\/b><span style=\"font-weight: 400;\"> against MQTT brokers with tools such as:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>MQTT Explorer<\/b><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>mosquitto_sub\/mosquitto_pub<\/b><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Metasploit<\/b><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Wireshark<\/b><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">An attacker could <\/span><b>subscribe to &#8216;#&#8217;<\/b><span style=\"font-weight: 400;\">, <\/span><b>receive sensor data<\/b><span style=\"font-weight: 400;\">, and <\/span><b>publish commands to critical topics<\/b><span style=\"font-weight: 400;\">, causing <\/span><b>unauthorized shutdowns of equipment<\/b><span style=\"font-weight: 400;\">.<\/span><\/p>\n<h2><b>OT Cybersecurity Best Practices with MQTT<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">To <\/span><b>reduce the risks associated with MQTT<\/b><span style=\"font-weight: 400;\"> in OT environments, we recommend the following measures:<\/span><\/p>\n<p>&nbsp;<\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Broker isolation<\/b><span style=\"font-weight: 400;\"> in a segmented network<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Strong client authentication<\/b><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Mandatory use of TLS<\/b><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Topic filtering via ACLs<\/b><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Continuous monitoring of MQTT traffic<\/b><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Deployment of MQTT honeypots<\/b><span style=\"font-weight: 400;\"> for threat detection<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Event and access logging and auditing<\/b><\/li>\n<\/ul>\n<h2><b>Conclusion<\/b><\/h2>\n<p><b>MQTT is a powerful tool<\/b><span style=\"font-weight: 400;\"> for improving <\/span><b>operational efficiency<\/b><span style=\"font-weight: 400;\">, but in OT environments its implementation must be done with <\/span><b>special caution<\/b><span style=\"font-weight: 400;\">. Its <\/span><b>simplicity and flexibility<\/b><span style=\"font-weight: 400;\"> should not overshadow the <\/span><b>risks involved<\/b><span style=\"font-weight: 400;\"> if not accompanied by an <\/span><b>adequate security strategy<\/b><span style=\"font-weight: 400;\">. Tools like <\/span><b>InprOTech Guardian<\/b><span style=\"font-weight: 400;\"> allow <\/span><b>monitoring and identification of anomalous behaviors in industrial networks<\/b><span style=\"font-weight: 400;\">, enabling <\/span><b>secure integration<\/b><span style=\"font-weight: 400;\"> of protocols like MQTT within <\/span><b>resilient and controlled OT architectures<\/b><span style=\"font-weight: 400;\">.<\/span><\/p>\n<h2><b>References<\/b><\/h2>\n<ol>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><a href=\"https:\/\/mqtt.org\/\"><span style=\"font-weight: 400;\">MQTT.org. MQTT Version 5.0 Specification.<\/span><\/a><span style=\"font-weight: 400;\">\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><a href=\"https:\/\/owasp.org\/www-community\/MQTT-Security-Cheat-Sheet\"><span style=\"font-weight: 400;\">OWASP MQTT Security Assessment Cheat Sheet<\/span><\/a><span style=\"font-weight: 400;\">.\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><a href=\"https:\/\/mosquitto.org\/\"><span style=\"font-weight: 400;\">Eclipse Mosquitto &#8211; An open source MQTT broker.<\/span><\/a><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><a href=\"https:\/\/www.rapid7.com\/db\/modules\/\"><span>Rapid7 &#8211; Metasploit Framework.<\/span><\/a><\/li>\n<\/ol>\n","protected":false},"excerpt":{"rendered":"<p>In an increasingly connected industrial world, MQTT (Message Queuing Telemetry Transport) has become one of the leading protocols for communication between IIoT devices. Designed to be lightweight, fast, and efficient, MQTT has gained ground over traditional protocols such as Modbus TCP or OPC UA in environments where data collection must be constant, asynchronous, and scalable&#8230;.<\/p>\n","protected":false},"author":1,"featured_media":2821,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[17],"tags":[],"class_list":["post-2818","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-techpapers-en"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>MQTT in OT Environments: Efficient Communication and Emerging Threats - InprOTech<\/title>\n<meta name=\"description\" content=\"Discover how MQTT optimizes communication in industrial OT environments and the cybersecurity risks that arise when it\u2019s implemented without proper protection.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/inprotech.es\/en\/mqtt-in-ot-environments-efficient-communication-and-emerging-threats\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"MQTT in OT Environments: Efficient Communication and Emerging Threats - 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