Overview
This article delves into the details of the recently discovered CVE-2025-50263 vulnerability, which affects Tenda AC6 routers version 15.03.05.16_multi. This cybersecurity threat is associated with a buffer overflow vulnerability in the function “fromSetRouteStatic” and it could potentially lead to severe consequences, including system compromise and data leakage. In the realm of cybersecurity, understanding such vulnerabilities is crucial for both individuals and organizations that use the affected devices, as it enables them to implement the necessary measures to protect their systems and data.
Vulnerability Summary
CVE ID: CVE-2025-50263
Severity: High (8.1)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: System compromise, Data leakage
Affected Products
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Product | Affected Versions
Tenda AC6 Router | v15.03.05.16_multi
How the Exploit Works
The vulnerability arises from a buffer overflow condition in the “fromSetRouteStatic” function of the Tenda AC6 router. Buffer overflow is a common type of security exploit that occurs when more data is written to a buffer than it can handle, causing the excess data to overflow into adjacent memory space. In this case, the vulnerability is triggered through the ‘list’ parameter, which, when manipulated with a particularly crafted input, can overflow the buffer, leading to unexpected behavior, including system crashes, incorrect outputs, or potential code execution.
Conceptual Example Code
The following is a simplified and conceptual example of how an attacker might exploit this vulnerability. The attacker sends a specially crafted payload through a POST request to the router’s configuration endpoint.
POST /cgi-bin/SetStaticRouteCfg HTTP/1.1
Host: tenda.router
Content-Type: application/x-www-form-urlencoded
list=AAAAAAAAAAA... (repeated until overflow occurs)In this case, the ‘list’ parameter is filled with an excessive amount of data (represented by ‘A’s), causing the buffer to overflow. The specifics of the malicious payload would depend on the attacker’s objective, which could range from causing a denial of service (crashing the router) to potentially executing arbitrary code.
Mitigation
Users of the affected Tenda AC6 routers should apply the patch provided by the vendor as soon as possible. If the patch cannot be applied immediately, the use of Web Application Firewalls (WAFs) or Intrusion Detection Systems (IDS) can provide temporary mitigation. These systems can be configured to detect and block suspicious activities associated with the exploitation of this vulnerability, providing an additional layer of security to the vulnerable systems. However, these should not be considered a long-term solution, and applying the vendor’s patch should be prioritized to ensure full protection against the vulnerability.