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CVE-2025-55972: Denial of Service Vulnerability in TCL Smart TV UPnP/DLNA MediaRenderer

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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’s functionality and the user experience.

Vulnerability Summary

CVE ID: CVE-2025-55972
Severity: High (7.5 CVSS Score)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: Potential system compromise or data leakage; loss of device functionality

Affected Products

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Product | Affected Versions

TCL Smart TV | All versions running a vulnerable UPnP/DLNA MediaRenderer implementation

How the Exploit Works

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’s functionality unless the attack ceases.

Conceptual Example Code

Below is a conceptual example of how the vulnerability might be exploited. This example represents a malicious HTTP request.

POST /upnp/control/mediarenderer1 HTTP/1.1
Host: target-smarttv.com
Content-Type: text/xml; charset="utf-8"
SOAPAction: "urn:schemas-upnp-org:service:AVTransport:1#SetAVTransportURI"
<?xml version="1.0" encoding="utf-8"?>
<s:Envelope xmlns:s="http://schemas.xmlsoap.org/soap/envelope/" s:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/">
<s:Body>
<u:SetAVTransportURI xmlns:u="urn:schemas-upnp-org:service:AVTransport:1">
<InstanceID>0</InstanceID>
<CurrentURI>[overly-long or malformed URI]</CurrentURI>
<CurrentURIMetaData>DD:upnp-org:av:2</CurrentURIMetaData>
</u:SetAVTransportURI>
</s:Body>
</s:Envelope>

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Disclaimer:

The information and code presented in this article are provided for educational and defensive cybersecurity purposes only. Any conceptual or pseudocode examples are simplified representations intended to raise awareness and promote secure development and system configuration practices.

Do not use this information to attempt unauthorized access or exploit vulnerabilities on systems that you do not own or have explicit permission to test.

Ameeba and its authors do not endorse or condone malicious behavior and are not responsible for misuse of the content. Always follow ethical hacking guidelines, responsible disclosure practices, and local laws.

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