Overview
A critical vulnerability has been identified in Tenda O3V2 1.0.0.12(3880), a widely used networking device. This flaw, designated as CVE-2025-7419, affects the httpd component of the system and can lead to a stack-based buffer overflow, resulting in potential system compromise or data leakage. This vulnerability is especially concerning as the exploit is already publicly disclosed and can be initiated remotely, raising the urgency to address this vulnerability.
Vulnerability Summary
CVE ID: CVE-2025-7419
Severity: Critical – CVSS Severity Score 8.8
Attack Vector: Remote
Privileges Required: None
User Interaction: None
Impact: Potential system compromise or data leakage
Affected Products
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Product | Affected Versions
Tenda O3V2 | 1.0.0.12(3880)
How the Exploit Works
The vulnerability lies in the manipulation of the ‘destIP’ argument in the fromSpeedTestSet function of /goform/setRateTest file. This improper input validation allows a remote attacker to trigger a stack-based buffer overflow, which can lead to arbitrary code execution. In other words, the attacker can manipulate the system as they wish, which can lead to unauthorized access, data leakage, or even total system compromise.
Conceptual Example Code
Consider the following conceptual HTTP request exploiting this vulnerability:
POST /goform/setRateTest HTTP/1.1
Host: target.example.com
Content-Type: application/x-www-form-urlencoded
destIP=127.0.0.1%00{malicious_shellcode}This request sends an overly long ‘destIP’ argument filled with the attacker’s malicious shellcode to the vulnerable endpoint. The ‘%00’ acts as a null terminator, effectively causing a buffer overflow and making the system execute the malicious shellcode.
Mitigation Guidance
Tenda should release a vendor patch to address this vulnerability. In the meantime, users can employ a Web Application Firewall (WAF) or Intrusion Detection System (IDS) as temporary mitigation. These tools can detect and block malicious traffic attempting to exploit this vulnerability. Users are urged to apply the vendor patch as soon as it becomes available and regularly update their systems to protect against such vulnerabilities.