Overview
A critical vulnerability, termed as CVE-2025-5850, has been identified in Tenda AC15 version 15.03.05.19_multi. This vulnerability, upon successful exploitation, has the potential to compromise the entire system and may result in sensitive data leakage. Given the severity of the issue and the high CVSS score, it is pivotal for all users of the affected system to apply the necessary patches and secure their systems. This article provides a comprehensive analysis of this vulnerability, its potential impact, and the steps that can be taken for mitigation.
Vulnerability Summary
CVE ID: CVE-2025-5850
Severity: Critical (8.8 CVSS Severity Score)
Attack Vector: Remote
Privileges Required: Low
User Interaction: Required
Impact: Potential system compromise and data leakage
Affected Products
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Product | Affected Versions
Tenda AC15 | 15.03.05.19_multi
How the Exploit Works
The vulnerability originates from the improper handling of the ‘Time’ argument within the ‘formsetschedled’ function in the ‘/goform/SetLEDCf’ file. A malicious actor can manipulate this argument to trigger a buffer overflow condition. This overflow condition can be exploited to execute arbitrary code on the system or even potentially gain full control of the system. Moreover, this attack can be initiated remotely, which exponentially increases the risk factor.
Conceptual Example Code
Here’s a conceptual example that demonstrates how a malicious HTTP POST request might be used to exploit this vulnerability. Please note that this is a simplified example and actual exploit code may vary significantly.
POST /goform/SetLEDCf HTTP/1.1
Host: target.IP.address
Content-Type: application/x-www-form-urlencoded
Time=AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA...In this example, the ‘Time’ parameter is filled with a long string of ‘A’ characters, causing the buffer to overflow and potentially allowing the execution of arbitrary code.
Mitigation
The best course of action is to apply the vendor patch to patch the vulnerability as soon as possible. However, if you’re unable to apply the patch immediately, using a Web Application Firewall (WAF) or an Intrusion Detection System (IDS) can provide temporary mitigation. These systems can detect and block malicious requests, thereby preventing the exploitation of the vulnerability.