Overview
A critical vulnerability identified as CVE-2025-5795 has been discovered, affecting the Tenda AC5 1.0/15.03.06.47 router. This vulnerability resides in the function fromadvsetlanip of the file /goform/AdvSetLanip, and it is linked to the improper handling of the lanMask argument which results in buffer overflow. Given the severity of this vulnerability, it is vital that network administrators and users of the affected product be aware and take necessary measures to mitigate the risk. This is because successful exploitation could lead to potential system compromise or data leakage.
Vulnerability Summary
CVE ID: CVE-2025-5795
Severity: Critical (8.8 CVSS v3)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: System compromise and potential data leakage
Affected Products
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Product | Affected Versions
Tenda AC5 | 1.0/15.03.06.47
How the Exploit Works
The vulnerability stems from the improper handling of the lanMask argument in the fromadvsetlanip function of the /goform/AdvSetLanip file. An attacker can manipulate this argument to cause a buffer overflow. This can be done remotely without requiring any user interaction or privileges. Upon successful exploitation, the attacker can potentially compromise the system and leak sensitive data.
Conceptual Example Code
The following is a conceptual example of how an attacker might exploit this vulnerability via a malicious HTTP request:
POST /goform/AdvSetLanip HTTP/1.1
Host: target.example.com
Content-Type: application/x-www-form-urlencoded
lanMask=256&lanIp=192.168.1.1&lanGateway=192.168.1.254In this example, the attacker manipulates the lanMask argument to an invalid value, causing a buffer overflow in the system. Note that this is a simplified example and real-world attacks may involve more complexity.
Mitigation Recommendations
Users and administrators are strongly advised to apply the vendor-provided patch as soon as possible to mitigate the risk posed by this vulnerability. If a patch cannot be immediately applied, implementing a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can serve as a temporary mitigation measure to detect and block attempts to exploit this vulnerability. However, these should not be seen as long-term solutions and users should apply patches as soon as they become available.