{"id":87095,"date":"2026-06-11T06:55:33","date_gmt":"2026-06-11T06:55:33","guid":{"rendered":""},"modified":"-0001-11-30T00:00:00","modified_gmt":"-0001-11-30T06:00:00","slug":"cve-2025-55972-denial-of-service-vulnerability-in-tcl-smart-tv-upnp-dlna-mediarenderer","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2025-55972-denial-of-service-vulnerability-in-tcl-smart-tv-upnp-dlna-mediarenderer\/","title":{"rendered":"<strong>CVE-2025-55972: Denial of Service Vulnerability in TCL Smart TV UPnP\/DLNA MediaRenderer<\/strong>"},"content":{"rendered":"<p><strong>Overview<\/strong><\/p>\n<p>The vulnerability in focus, CVE-2025-55972, affects a TCL Smart TV running a vulnerable UPnP\/DLNA MediaRenderer implementation. The flaw can lead to a remote, unauthenticated Denial of Service (DoS) condition, posing significant threats to the affected device&#8217;s functionality and the user experience.<\/p>\n<p><strong>Vulnerability Summary<\/strong><\/p>\n<p>CVE ID: CVE-2025-55972<br \/>\nSeverity: High (7.5 CVSS Score)<br \/>\nAttack Vector: Network<br \/>\nPrivileges Required: None<br \/>\nUser Interaction: None<br \/>\nImpact: Potential system compromise or data leakage; loss of device functionality<\/p>\n<p><strong>Affected Products<\/strong><\/p><div id=\"ameeb-572534481\" class=\"ameeb-content-2 ameeb-entity-placement\"><div style=\"border-left: 4px solid #555; padding-left: 20px; margin: 48px 0; font-family: Roboto, sans-serif; color: #ffffff; line-height: 1.6; max-width: 720px;\">\r\n  <h2 style=\"margin-top: 0; font-size: 22px; font-weight: 600; display: flex; align-items: center; letter-spacing: -0.02em;\">\r\n    <a href=\"https:\/\/www.ameeba.com\/chat\" style=\"display: inline-flex; align-items: center; margin-right: 10px;\">\r\n      <img decoding=\"async\" src=\"https:\/\/www.ameeba.com\/blog\/wp-content\/uploads\/2025\/10\/Best-App-icon-Ameeba.png\" alt=\"Ameeba Chat Icon\" style=\"width: 42px; height: 42px;\" \/>\r\n    <\/a>\r\n    Share secrets securely\r\n  <\/h2>\r\n\r\n  <p style=\"margin-bottom: 14px; color: #d1d5db;\">\r\n    Ameeba is private infrastructure for communication and sensitive work built on encrypted identity instead of exposed corporate identity systems.\r\n  <\/p>\r\n\r\n  <p style=\"margin-bottom: 18px; color: #a1a1aa;\">\r\n    Passwords, credentials, confidential files, screenshots, internal discussions, sensitive AI context, and private coordination should not become exposed across ordinary communication platforms.\r\n  <\/p>\r\n\r\n  <ul style=\"list-style: none; padding-left: 0; margin-bottom: 24px; color: #e4e4e7;\">\r\n    <li style=\"margin-bottom: 8px;\">\u2022 Encrypted identity<\/li>\r\n    <li style=\"margin-bottom: 8px;\">\u2022 Private Spaces for organizations and teams<\/li>\r\n    <li style=\"margin-bottom: 8px;\">\u2022 End-to-end encrypted chat, calls, files, and notes<\/li>\r\n    <li style=\"margin-bottom: 8px;\">\u2022 Sensitive AI work and protected collaboration<\/li>\r\n    <li>\u2022 Built for information that cannot leak<\/li>\r\n  <\/ul>\r\n\r\n  <p style=\"font-style: italic; font-weight: 600; margin-bottom: 24px; color: #ffffff;\">\r\n    Our mission is to secure human work alongside AI.\r\n  <\/p>\r\n\r\n  <div style=\"display: flex; flex-wrap: wrap; gap: 12px;\">\r\n    <a href=\"https:\/\/www.ameeba.com\/chat\/download\" style=\"background-color: #ffffff; color: #000000; padding: 10px 20px; text-decoration: none; border-radius: 8px; font-weight: 500;\">\r\n      Download Ameeba\r\n    <\/a>\r\n\r\n    <a href=\"https:\/\/www.ameeba.com\/chat\" style=\"border: 1px solid #ffffff; color: #ffffff; padding: 10px 20px; text-decoration: none; border-radius: 8px; font-weight: 500;\">\r\n      Learn More\r\n    <\/a>\r\n  <\/div>\r\n<\/div><\/div>\n<p>Product | Affected Versions<\/p>\n<p>TCL Smart TV | All versions running a vulnerable UPnP\/DLNA MediaRenderer implementation<\/p>\n<p><strong>How the Exploit Works<\/strong><\/p>\n<p>An attacker can exploit this vulnerability by sending a flood of malformed or oversized SetAVTransportURI SOAP requests to the UPnP control endpoint of the TCL Smart TV. This flood of requests causes the device to become unresponsive, disrupting all forms of TV operation. The denial persists as long as the attack continues, and manual user control or even reboots do not restore the device&#8217;s functionality unless the attack ceases.<\/p>\n<p><strong>Conceptual Example Code<\/strong><\/p><div id=\"ameeb-1697390506\" class=\"ameeb-content ameeb-entity-placement\"><div class=\"poptin-embedded\" data-id=\"f6b387694f681\"><\/div>\r\n\r\n\r\n\r\n\r\n\r\n<\/div>\n<p>Below is a conceptual example of how the vulnerability might be exploited. This example represents a malicious HTTP request.<\/p>\n<pre><code class=\"\" data-line=\"\">POST \/upnp\/control\/mediarenderer1 HTTP\/1.1\nHost: target-smarttv.com\nContent-Type: text\/xml; charset=&quot;utf-8&quot;\nSOAPAction: &quot;urn:schemas-upnp-org:service:AVTransport:1#SetAVTransportURI&quot;\n&lt;?xml version=&quot;1.0&quot; encoding=&quot;utf-8&quot;?&gt;\n&lt;s:Envelope xmlns:s=&quot;http:\/\/schemas.xmlsoap.org\/soap\/envelope\/&quot; s:encodingStyle=&quot;http:\/\/schemas.xmlsoap.org\/soap\/encoding\/&quot;&gt;\n&lt;s:Body&gt;\n&lt;u:SetAVTransportURI xmlns:u=&quot;urn:schemas-upnp-org:service:AVTransport:1&quot;&gt;\n&lt;InstanceID&gt;0&lt;\/InstanceID&gt;\n&lt;CurrentURI&gt;[overly-long or malformed URI]&lt;\/CurrentURI&gt;\n&lt;CurrentURIMetaData&gt;DD:upnp-org:av:2&lt;\/CurrentURIMetaData&gt;\n&lt;\/u:SetAVTransportURI&gt;\n&lt;\/s:Body&gt;\n&lt;\/s:Envelope&gt;<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>Overview The vulnerability in focus, CVE-2025-55972, affects a TCL Smart TV running a vulnerable UPnP\/DLNA MediaRenderer implementation. The flaw can lead to a remote, unauthenticated Denial of Service (DoS) condition, posing significant threats to the affected device&#8217;s functionality and the user experience. Vulnerability Summary CVE ID: CVE-2025-55972 Severity: High (7.5 CVSS Score) Attack Vector: Network [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"footnotes":""},"categories":[],"tags":[],"vendor":[],"product":[],"attack_vector":[],"asset_type":[],"severity":[],"exploit_status":[],"class_list":["post-87095","post","type-post","status-publish","format-standard","hentry"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/87095","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/comments?post=87095"}],"version-history":[{"count":0,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/87095\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/media?parent=87095"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/categories?post=87095"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/tags?post=87095"},{"taxonomy":"vendor","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/vendor?post=87095"},{"taxonomy":"product","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/product?post=87095"},{"taxonomy":"attack_vector","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/attack_vector?post=87095"},{"taxonomy":"asset_type","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/asset_type?post=87095"},{"taxonomy":"severity","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/severity?post=87095"},{"taxonomy":"exploit_status","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/exploit_status?post=87095"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}