Overview
Common Vulnerabilities and Exposures (CVE) are a constant concern in the world of cybersecurity, and the CVE-2025-5600 is no exception. This critical vulnerability has been identified in TOTOLINK EX1200T version 4.1.2cu.5232_B20210713, a popular networking device. This vulnerability could potentially have far-reaching implications, allowing attackers to carry out remote attacks and gain unauthorized access.
The importance of addressing this vulnerability cannot be overstated. Given the potential for system compromise and data leakage, swift action is required to mitigate this risk and protect the integrity of the affected systems.
Vulnerability Summary
CVE ID: CVE-2025-5600
Severity: Critical (CVSS Severity Score: 9.8)
Attack Vector: Remote
Privileges Required: None
User Interaction: None
Impact: Potential system compromise and data leakage.
Affected Products
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Product | Affected Versions
TOTOLINK EX1200T | 4.1.2cu.5232_B20210713
How the Exploit Works
The vulnerability stems from a stack-based buffer overflow issue in the function setLanguageCfg of the file /cgi-bin/cstecgi.cgi. More specifically, the vulnerability arises from the improper handling of the LangType argument, which can be manipulated to overflow the buffer. This overflow can potentially allow an attacker to execute arbitrary code and gain unauthorized access to the system.
Conceptual Example Code
Below is a conceptual example of how this vulnerability could be exploited. This is not actual exploit code, but an illustration of the kind of request that could be used to take advantage of the vulnerability.
POST /cgi-bin/cstecgi.cgi HTTP/1.1
Host: target.example.com
Content-Type: application/x-www-form-urlencoded
setLanguageCfg=1&LangType=<malicious_payload>The “ would be a carefully crafted string designed to overflow the buffer and potentially execute arbitrary code.
Mitigation
Users of affected TOTOLINK EX1200T versions are strongly advised to apply the vendor-issued patch immediately. In the interim, employing a Web Application Firewall (WAF) or an Intrusion Detection System (IDS) can provide temporary mitigation against potential attacks. Regular monitoring and vigilance are also crucial in detecting any unusual activity.