Overview
The security of our digital landscape is constantly under threat from hackers trying to exploit system vulnerabilities. The recent discovery of a critical vulnerability, CVE-2025-25456, in Tenda AC10 V4.0si_V16.03.10.20, is a stark reminder of the importance of regular system updates and patch application. This flaw is a serious concern due to its high severity and potential impact on confidentiality, integrity, and availability of data.
The vulnerability affects Tenda AC10 V4.0si_V16.03.10.20, a widely used wireless router. As a buffer overflow vulnerability, it’s susceptible to exploitation by malicious actors. This could lead to serious implications including potential system compromise or data leakage, creating significant risk for users.
Vulnerability Summary
CVE ID: CVE-2025-25456
Severity: Critical – CVSS 9.8
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: System compromise, potential data leakage
Affected Products
No phone number, email, or personal info required.
Product | Affected Versions
Tenda AC10 | V4.0si_V16.03.10.20
How the Exploit Works
The vulnerability resides in the AdvSetMacMtuWan function of the Tenda AC10 V4.0si_V16.03.10.20. It’s a buffer overflow vulnerability, which happens when more data is put into a buffer or holding area than the buffer can handle. This causes an overflow of data that can overwrite other data points, potentially leading to erratic program behavior, system crashes, or exploitable conditions for attackers.
In this case, an attacker can exploit the vulnerability by sending a specially crafted request to the mac2 parameter of the AdvSetMacMtuWan function. This causes the buffer to overflow and allows the attacker to execute arbitrary code or potentially gain control of the system.
Conceptual Example Code
An attacker might exploit this vulnerability through a malicious HTTP request that could look something like this:
POST /AdvSetMacMtuWan/mac2 HTTP/1.1
Host: target.example.com
Content-Type: application/json
{ "mac2": "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA…" }In this example, the ‘A’s represent a large amount of data exceeding the buffer’s capacity, leading to overflow and the potential execution of malicious code.
Mitigation Guidance
Users of Tenda AC10 V4.0si_V16.03.10.20 are advised to apply the vendor patch as soon as possible to mitigate the risk. In the absence of a vendor patch, deploying a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can provide temporary mitigation. It’s crucial to regularly update systems and apply patches promptly to protect against such vulnerabilities.