Overview
The cybersecurity landscape is fraught with evolving threats, a scenario vividly exemplified by the recently discovered critical vulnerability CVE-2025-5527. This issue affects a broad range of devices running the Tenda RX3 16.03.13.11_multi_TDE01 software. It’s particularly alarming because of its potential to enable system compromise and data leakage, hence the urgency to address it. The vulnerability impacts the function save_staticroute_data of the file /goform/SetStaticRouteCfg, and the exploit has been disclosed publicly.
Vulnerability Summary
CVE ID: CVE-2025-5527
Severity: Critical (CVSS 8.8)
Attack Vector: Remote Network
Privileges Required: None
User Interaction: None
Impact: Potential system compromise and data leakage
Affected Products
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Product | Affected Versions
Tenda | RX3 16.03.13.11_multi_TDE01
How the Exploit Works
The vulnerability CVE-2025-5527 is a stack-based buffer overflow issue. It occurs when the function save_staticroute_data of the file /goform/SetStaticRouteCfg manipulates the argument list. The buffer overflow happens when the system attempts to store more data in a buffer than it can handle. This technique can be exploited by an attacker to corrupt the execution stack of a software application, leading to a system crash or potentially allowing the execution of malicious code.
Conceptual Example Code
The following conceptual HTTP request could potentially trigger this vulnerability:
POST /goform/SetStaticRouteCfg HTTP/1.1
Host: target.example.com
Content-Type: application/x-www-form-urlencoded
arg1=value1&arg2=value2&...&argN=very_long_valueIn the example above, the `very_long_value` represents an excessively long string that would overflow the buffer when the `save_staticroute_data` function attempts to store it.
Mitigation Guidance
Until the vendor provides a patch, there are temporary mitigations that can be implemented to lessen the risk posed by this vulnerability. These include using a Web Application Firewall (WAF) or Intrusion Detection System (IDS). These systems can detect and block attempts to exploit this vulnerability. Nonetheless, users are strongly encouraged to apply the vendor’s patch as soon as it becomes available to permanently address this issue.