Overview
A critical vulnerability has been identified in Tenda AC8 routers, specifically version 16.03.34.09. This vulnerability, referenced as CVE-2025-5798, allows remote attackers to exploit a stack-based buffer overflow in the SetSysTimeCfg function. This vulnerability can lead to serious consequences such as a full system compromise or data leakage, making it a significant security concern for any individual or organization utilizing the Tenda AC8. Immediate action is required to mitigate the risk.
Vulnerability Summary
CVE ID: CVE-2025-5798
Severity: Critical (CVSS 8.8)
Attack Vector: Remote
Privileges Required: None
User Interaction: None
Impact: System compromise and potential data leakage
Affected Products
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Product | Affected Versions
Tenda AC8 | 16.03.34.09
How the Exploit Works
The vulnerability resides in the fromSetSysTime function of the file /goform/SetSysTimeCfg. By manipulating the timeType argument, an attacker can cause a stack-based buffer overflow. The overflow can be used to overwrite the program’s control flow, leading to remote code execution and potentially full system compromise. The exploit can be triggered remotely without any user interaction, making it a particularly dangerous vulnerability.
Conceptual Example Code
The following conceptual example shows how the vulnerability might be exploited. The malicious payload would be crafted to overflow the buffer and manipulate the program’s control flow.
POST /goform/SetSysTimeCfg HTTP/1.1
Host: target.example.com
Content-Type: application/x-www-form-urlencoded
timeType=1&timezone=<malicious_payload>In this example, `
Mitigation
Users of Tenda AC8 version 16.03.34.09 are advised to apply the patch provided by the vendor as soon as possible. As a temporary mitigation, users may also employ a Web Application Firewall (WAF) or Intrusion Detection System (IDS) to detect and block exploit attempts. However, these measures will not fix the underlying vulnerability and are only intended as a stopgap until the patch can be applied.