Overview
The cybersecurity industry is always in a constant state of evolution. To keep up with the ever-changing threats, it’s critical to stay informed about the latest vulnerabilities. A newly discovered and disclosed vulnerability, dubbed as CVE-2025-5853, has been classified as critical with a CVSS severity score of 8.8. This vulnerability resides in the Tenda AC6 15.03.05.16 router, specifically within the function formSetSafeWanWebMan of the file /goform/SetRemoteWebCfg. The vulnerability presents a real risk to users and businesses alike due to its potential for system compromise or data leakage.
Vulnerability Summary
CVE ID: CVE-2025-5853
Severity: Critical (8.8 CVSS score)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: System compromise or data leakage
Affected Products
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Product | Affected Versions
Tenda AC6 | 15.03.05.16
How the Exploit Works
The exploitation of CVE-2025-5853 involves the manipulation of the ‘remoteIp’ argument in the ‘formSetSafeWanWebMan’ function. This manipulation leads to a stack-based buffer overflow, a common type of vulnerability that can lead to arbitrary code execution. Due to this overflow, an attacker can remotely execute arbitrary code, potentially compromising the system or leading to data leakage.
Conceptual Example Code
Here is a conceptual example of how an HTTP request might be manipulated to exploit this vulnerability:
POST /goform/SetRemoteWebCfg HTTP/1.1
Host: target.example.com
Content-Type: application/x-www-form-urlencoded
remoteIp=192.168.0.1%00[buffer_overflow_string]In this hypothetical example, the ‘remoteIp’ parameter is manipulated with a string that causes a buffer overflow, allowing the attacker to execute arbitrary code.
Mitigation Guidance
To mitigate the impact of CVE-2025-5853, it’s recommended to 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) may serve as a temporary mitigation. These systems can help prevent the exploit from reaching your systems. However, they should not be seen as a permanent solution, as the best mitigation is always to patch the vulnerability.
Stay safe and keep your systems updated to protect against such vulnerabilities.