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CVE-2025-5863: Critical Stack-Based Buffer Overflow Vulnerability in Tenda AC5

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Overview

CVE-2025-5863 is a critical vulnerability found in Tenda AC5 15.03.06.47, a popular networking device. This particular vulnerability can lead to potential system compromise or data leakage, putting the security of sensitive data at risk. The exploit affects the function formSetRebootTimer of the file /goform/SetRebootTimer and can be triggered by the manipulation of the argument rebootTime. Due to the severity of the vulnerability, its potential impact, and the fact that it can be exploited remotely, it is crucial for users and administrators to understand the threat and take the necessary steps to mitigate it.

Vulnerability Summary

CVE ID: CVE-2025-5863
Severity: Critical (CVSS: 8.8)
Attack Vector: Remote
Privileges Required: None
User Interaction: None required
Impact: Potential system compromise or data leakage

Affected Products

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Product | Affected Versions

Tenda AC5 | 15.03.06.47

How the Exploit Works

The vulnerability is present in the formSetRebootTimer function of the file /goform/SetRebootTimer. The function fails to correctly validate the rebootTime argument, leading to a stack-based buffer overflow. This overflow can be taken advantage of to execute arbitrary code on the system or to cause a denial of service by crashing the system. The vulnerability can be exploited remotely without requiring any user interaction or special privileges.

Conceptual Example Code

An attacker could potentially exploit this vulnerability by sending a crafted HTTP request that includes a malicious value for the rebootTime argument, like this:

POST /goform/SetRebootTimer HTTP/1.1
Host: target.example.com
Content-Type: application/x-www-form-urlencoded
rebootTime=AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA...

In this example, the `rebootTime` argument is filled with an excessive number of ‘A’ characters, leading to a buffer overflow.

Mitigation

Users are advised to apply the official vendor patch once it becomes available. Until the patch is applied, users can protect their systems by using a Web Application Firewall (WAF) or an Intrusion Detection System (IDS) as a temporary mitigation measure. These security measures can help to detect and block attempts to exploit this vulnerability.

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Disclaimer:

The information and code presented in this article are provided for educational and defensive cybersecurity purposes only. Any conceptual or pseudocode examples are simplified representations intended to raise awareness and promote secure development and system configuration practices.

Do not use this information to attempt unauthorized access or exploit vulnerabilities on systems that you do not own or have explicit permission to test.

Ameeba and its authors do not endorse or condone malicious behavior and are not responsible for misuse of the content. Always follow ethical hacking guidelines, responsible disclosure practices, and local laws.

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