{"id":41251,"date":"2021-06-08T13:05:11","date_gmt":"2021-06-08T13:05:11","guid":{"rendered":"https:\/\/www.threatshub.org\/blog\/dos-vulns-in-3-open-source-mqtt-message-brokers-could-leave-users-literally-locked-out-of-their-homes-or-offices\/"},"modified":"2021-06-08T13:05:11","modified_gmt":"2021-06-08T13:05:11","slug":"dos-vulns-in-3-open-source-mqtt-message-brokers-could-leave-users-literally-locked-out-of-their-homes-or-offices","status":"publish","type":"post","link":"https:\/\/www.threatshub.org\/blog\/dos-vulns-in-3-open-source-mqtt-message-brokers-could-leave-users-literally-locked-out-of-their-homes-or-offices\/","title":{"rendered":"DoS vulns in 3 open-source MQTT message brokers could leave users literally locked out of their homes or offices"},"content":{"rendered":"<p>Synopsys Cybersecurity Research Centre (CyRC) has warned of easily triggered denial-of-service (DoS) vulnerabilities in three popular open-source Internet of Things message brokers: RabbitMQ, EMQ X, and VerneMQ.<\/p>\n<p>The message brokers, responsible for handling data sent to or from IoT devices like smart home hubs and door locks, all share a common protocol: Message Queuing Telemetry Transport (MQTT), first released in 1999 for monitoring oil pipelines and since repurposed for a variety of home and industrial automation tasks. Any disruption in MQTT messaging could potentially leave users locked out of their homes and offices.<\/p>\n<p>&#8220;Message brokers are software applications that serve as a messaging hub for complex systems,&#8221; said Jonathan Knudsen, Synopsys senior security strategist responsible for discovering the vulnerabilities, in the public disclosure. &#8220;They provide reliable communication channels between different components, serving as the nerve center of a complex system. As such, message brokers can also be a central point of failure.&#8221;<\/p>\n<div aria-hidden=\"true\" class=\"adun\" data-pos=\"top\" data-raptor=\"condor\" data-xsm=\",fluid,mpu,\" data-sm=\",fluid,mpu,\" data-md=\",fluid,leaderboard,mpu,\" data-lg=\",fluid,leaderboard,\" data-xlg=\",fluid,superleaderboard,billboard,leaderboard,\"> <noscript> <a href=\"https:\/\/pubads.g.doubleclick.net\/gampad\/jump?co=1&amp;iu=\/6978\/reg_security\/front&amp;sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&amp;tile=2&amp;c=2YL94IlPU-Y1fw4nnYg7EaQAAANc&amp;t=ct%3Dns%26unitnum%3D2%26raptor%3Dcondor%26pos%3Dtop%26test%3D0\" target=\"_blank\" rel=\"noopener noreferrer\"> <img decoding=\"async\" src=\"https:\/\/pubads.g.doubleclick.net\/gampad\/ad?co=1&amp;iu=\/6978\/reg_security\/front&amp;sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&amp;tile=2&amp;c=2YL94IlPU-Y1fw4nnYg7EaQAAANc&amp;t=ct%3Dns%26unitnum%3D2%26raptor%3Dcondor%26pos%3Dtop%26test%3D0\" alt> <\/a> <\/noscript> <\/div>\n<p>All three message brokers affected by Knudsen&#8217;s discovery can be fooled into bloating their memory usage until they are terminated by the host operating system by sending them a specially crafted MQTT message. Once terminated, any IoT device on the network which relies on the MQTT message broker will be rendered inoperable.<\/p>\n<div aria-hidden=\"true\" class=\"adun\" data-pos=\"top\" data-raptor=\"falcon\" data-xxlg=\",fluid,billboard,superleaderboard,brandwidth,brandimpact,leaderboard,mpu,\"> <noscript> <a href=\"https:\/\/pubads.g.doubleclick.net\/gampad\/jump?co=1&amp;iu=\/6978\/reg_security\/front&amp;sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&amp;tile=4&amp;c=44YL94IlPU-Y1fw4nnYg7EaQAAANc&amp;t=ct%3Dns%26unitnum%3D4%26raptor%3Dfalcon%26pos%3Dmid%26test%3D0\" target=\"_blank\" rel=\"noopener noreferrer\"> <img decoding=\"async\" src=\"https:\/\/pubads.g.doubleclick.net\/gampad\/ad?co=1&amp;iu=\/6978\/reg_security\/front&amp;sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&amp;tile=4&amp;c=44YL94IlPU-Y1fw4nnYg7EaQAAANc&amp;t=ct%3Dns%26unitnum%3D426raptor%3Dfalcon%26pos%3Dmid%26test%3D0\" alt> <\/a> <\/noscript> <\/div>\n<div class=\"adun_eagle_desktop_story_wrapper\">\n<div aria-hidden=\"true\" class=\"adun\" data-pos=\"mid\" data-raptor=\"eagle\" data-xxlg=\",mpu,dmpu,\"> <noscript> <a href=\"https:\/\/pubads.g.doubleclick.net\/gampad\/jump?co=1&amp;iu=\/6978\/reg_security\/front&amp;sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&amp;tile=3&amp;c=33YL94IlPU-Y1fw4nnYg7EaQAAANc&amp;t=ct%3Dns%26unitnum%3D3%26raptor%3Deagle%26pos%3Dmid%26test%3D0\" target=\"_blank\" rel=\"noopener noreferrer\"> <img decoding=\"async\" src=\"https:\/\/pubads.g.doubleclick.net\/gampad\/ad?co=1&amp;iu=\/6978\/reg_security\/front&amp;sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&amp;tile=3&amp;c=33YL94IlPU-Y1fw4nnYg7EaQAAANc&amp;t=ct%3Dns%26unitnum%3D3%26raptor%3Deagle%26pos%3Dmid%26test%3D0\" alt> <\/a> <\/noscript> <\/div>\n<\/p><\/div>\n<p>&#8220;If the message broker dies, system components won&#8217;t be able to communicate,&#8221; Knudsen continued. &#8220;CVE-2021-22116, CVE-2021-33175, and CVE-2021-33176 are denial of service vulnerabilities in three popular open source message brokers. They give attackers the opportunity to disable the message brokers, a denial-of-service attack that could have serious consequences.&#8221;<\/p>\n<p>The precise details of the vulnerability differ from system to system. While all are triggered by a malicious MQTT message, the message has to be written specifically for the target message broker. Knudsen&#8217;s research revealed three messages, each of which crashes a single message broker, but reported no luck in finding a single message capable of crashing all three \u2013 a small comfort to beleaguered system administrators.<\/p>\n<p>Knudsen and CyRC privately disclosed the flaws to the project maintainers back in March, and all three have now been patched. RabbitMQ users are advised to upgrade to <a target=\"_blank\" href=\"https:\/\/github.com\/rabbitmq\/rabbitmq-server\/releases\/tag\/v3.8.16\" rel=\"noopener noreferrer\">version 3.8.16 or above<\/a>; EMQ X users to <a target=\"_blank\" href=\"https:\/\/docs.emqx.io\/en\/broker\/\" rel=\"noopener noreferrer\">version 4.2.8 or above<\/a>; and VerneMQ users to <a target=\"_blank\" href=\"https:\/\/github.com\/vernemq\/vernemq\/releases\/tag\/1.12.0\" rel=\"noopener noreferrer\">version 1.12.0 or above<\/a>. \u00ae<\/p>\n<p> READ MORE <a href=\"https:\/\/go.theregister.com\/feed\/www.theregister.com\/2021\/06\/08\/mqtt_dos_vulnerabilities\/\">HERE<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>If your IoT kit employs RabbitMQ, EMQ X or VerneMQ, it&#8217;s time to get patching Synopsys Cybersecurity Research Centre (CyRC) has warned of easily triggered denial-of-service (DoS) vulnerabilities in three popular open-source Internet of Things message brokers: RabbitMQ, EMQ X, and VerneMQ.\u2026  READ MORE HERE&#8230;<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"colormag_page_layout":"default_layout","footnotes":""},"categories":[63],"tags":[],"class_list":["post-41251","post","type-post","status-publish","format-standard","hentry","category-the-register"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>DoS vulns in 3 open-source MQTT message brokers could leave users literally locked out of their homes or offices 2026 | ThreatsHub Cybersecurity News<\/title>\n<meta name=\"description\" content=\"ThreatsHub Cybersecurity News | ThreatsHub.org | Cloud Security &amp; Cyber Threats Analysis Hub. 100% Free OSINT Threat Intelligent and Cybersecurity News.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, 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