Overview
CVE-2025-5608 is a critical vulnerability found in Tenda AC18 15.03.05.05, a widely used wireless router. This vulnerability lies in the formsetreboottimer function of the file /goform/SetSysAutoRebbotCfg. It is of particular concern because the vulnerability can be exploited remotely, posing a significant risk to users’ data security and system integrity. With the exploit already disclosed to the public, immediate actions are required to mitigate the threat.
Vulnerability Summary
CVE ID: CVE-2025-5608
Severity: Critical (8.8/10)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: Potential system compromise or data leakage
Affected Products
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Product | Affected Versions
Tenda | AC18 15.03.05.05
How the Exploit Works
The vulnerability is a buffer overflow that occurs when an overly long argument is fed to the ‘rebootTime’ parameter in the formsetreboottimer function in the /goform/SetSysAutoRebbotCfg file of Tenda AC18. This overflow can then be manipulated to execute arbitrary code on the system. Given that this operation can be performed remotely, an attacker does not need physical access to the device to exploit this vulnerability.
Conceptual Example Code
Here’s a conceptual example of how the vulnerability might be exploited. This could be a sample HTTP POST request that sends an overly long rebootTime parameter:
POST /goform/SetSysAutoRebbotCfg HTTP/1.1
Host: target.example.com
Content-Type: application/x-www-form-urlencoded
rebootTime=AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA......In this example, the ‘A’s represent an overly long argument, causing buffer overflow. An attacker could replace these ‘A’s with malicious code designed to compromise the system or leak data.
Mitigation
Users of Tenda AC18 15.03.05.05 are advised to apply the vendor’s patch as soon as possible. If the patch cannot be immediately applied, a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can serve as a temporary mitigation, effectively blocking attempts to exploit this vulnerability. As always, users should ensure that their systems and applications are regularly updated to the most recent versions to protect against known vulnerabilities.