Overview
The cybersecurity landscape is fraught with various kinds of vulnerabilities, one of which is the CVE-2025-7913. Classified as critical, this vulnerability affects the TOTOLINK T6 4.1.5cu.748_B20211015. It exposes the MQTT Service’s function updateWifiInfo to manipulation of the argument serverIp that leads to a buffer overflow. The vulnerability is of critical importance as it allows an attacker to remotely launch an attack, potentially compromising the system or leading to data leakage.
Vulnerability Summary
CVE ID: CVE-2025-7913
Severity: Critical (8.8 CVSS Severity Score)
Attack Vector: Remote via Network
Privileges Required: None
User Interaction: None
Impact: Potential system compromise or data leakage
Affected Products
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Product | Affected Versions
TOTOLINK T6 | 4.1.5cu.748_B20211015
How the Exploit Works
The vulnerability resides in the MQTT Service’s function updateWifiInfo. The function’s argument serverIp can be manipulated in such a way that it causes a buffer overflow. This is essentially an anomaly where a program, while writing data to a buffer, overruns the buffer’s boundary and overwrites adjacent memory locations. This overrun could be exploited to inject malicious code into the system, execute arbitrary code, or even crash the system.
Conceptual Example Code
Below is a conceptual example of how the vulnerability might be exploited. It represents how a malformed packet could be sent to the serverIp argument to trigger the buffer overflow:
POST /updateWifiInfo HTTP/1.1
Host: target.example.com
Content-Type: application/json
{ "serverIp": "A long string that overflows the buffer..." }This example is not a working exploit, but serves to illustrate the type of input that an attacker might use to exploit the vulnerability.
Mitigation and Prevention
The most effective way to mitigate this vulnerability is to apply the vendor patch as soon as it is available. In the meantime, using a Web Application Firewall (WAF) or an Intrusion Detection System (IDS) could provide temporary protection. These systems can help to identify and block potentially malicious traffic. Regular security audits and software updates are also highly recommended to prevent future vulnerabilities.