Overview
The vulnerability, identified as CVE-2025-55605, is a critical flaw in the Tenda AX3 router’s firmware V16.03.12.10_CN. This vulnerability could potentially allow attackers to overrun a buffer within the saveParentControlInfo function via the deviceName parameter, which could lead to system compromise or data leakage. Given the widespread use of Tenda AX3 routers, this vulnerability could have severe consequences if left unpatched.
Vulnerability Summary
CVE ID: CVE-2025-55605
Severity: High (7.5)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: System compromise, Potential data leakage
Affected Products
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Product | Affected Versions
Tenda AX3 | V16.03.12.10_CN
How the Exploit Works
The exploit takes advantage of a buffer overflow vulnerability in the saveParentControlInfo function of the Tenda AX3’s firmware. An attacker can supply an excessively long string in the deviceName parameter, which exceeds the buffer’s capacity. This overflow can overwrite adjacent memory locations, potentially leading to arbitrary code execution, system crashes, or information disclosure.
Conceptual Example Code
The following is a conceptual example of how the vulnerability might be exploited. This example shows a malicious HTTP POST request that sends an excessively long string as the deviceName parameter.
POST /saveParentControlInfo HTTP/1.1
Host: target.example.com
Content-Type: application/json
{ "deviceName": "A".repeat(10000) } // Excessively long stringIt should be noted that this is just a conceptual example. The actual exploit may require specific knowledge of the system’s memory layout, and the deviceName string may need to contain specific bytes to trigger the desired overflow effect.
Mitigation
Users are advised to apply the patch provided by the vendor as soon as possible. As a temporary mitigation, Web Application Firewalls (WAF) or Intrusion Detection Systems (IDS) can be used to monitor and block potential exploit attempts. However, these should not be considered as a permanent solution, and the vendor patch should still be applied.