Overview
CVE-2025-5851 is a critical vulnerability that has been discovered in Tenda AC15 15.03.05.19_multi. This vulnerability is potentially devastating as it allows for a buffer overflow attack, which could lead to system compromise or data leakage. Given that the exploit has been publicly disclosed, it is of utmost importance that affected systems apply the necessary patches or mitigation measures to protect against this vulnerability.
This vulnerability not only affects individual users but also poses a significant threat to organizations using the Tenda AC15 15.03.05.19_multi. The risk of a successful exploit can lead to unauthorized access, alteration, or even deletion of data, which could have devastating consequences for businesses.
Vulnerability Summary
CVE ID: CVE-2025-5851
Severity: Critical (8.8/10 on CVSS)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: Potential system compromise or data leakage
Affected Products
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Product | Affected Versions
Tenda AC15 | 15.03.05.19_multi
How the Exploit Works
The vulnerability is found in the HTTP POST Request Handler component of the Tenda AC15 15.03.05.19_multi, specifically in the function fromadvsetlanip of the file /goform/AdvSetLanip. The manipulation of the argument lanMask leads to a buffer overflow. This means that an attacker can send a specially crafted HTTP POST request, which exceeds the expected data size, to overflow the buffer and execute arbitrary code or crash the system.
Conceptual Example Code
Here is a conceptual example of how an attacker might exploit this vulnerability using a malicious HTTP POST request:
POST /goform/AdvSetLanip HTTP/1.1
Host: target.example.com
Content-Type: application/x-www-form-urlencoded
lanMask=255.255.255.0&lanIp=192.168.0.1&lanMask=AAAA...[long string of A's to overflow buffer]The above example demonstrates a long string of “A” characters used to overflow the buffer. This is a typical method used in buffer overflow attacks. Please note that this is a simplified representation and actual exploit code would likely involve more complex manipulations.
Mitigation and Patching
Given the severity of this vulnerability, it is recommended that users apply the vendor patch as soon as possible. If the patch cannot be applied immediately, using a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can provide temporary mitigation.
Regularly updating and patching systems, as well as monitoring network traffic for unusual activity, can also help to prevent successful exploits of this vulnerability.