Overview
The cybersecurity landscape is continually evolving, with new vulnerabilities appearing frequently. One such vulnerability that has recently come to light is CVE-2025-6734. This critical vulnerability is found in UTT HiPER 840G up to version 3.1.1-190328 and poses a significant risk to users of this product.
The vulnerability affects the API component of the UTT HiPER 840G, specifically the function sub_484E40 of the file /goform/formP2PLimitConfig. The problem arises due to a manipulable argument leading to buffer overflow, which could potentially allow a remote attacker to compromise the system or leak sensitive data.
Vulnerability Summary
CVE ID: CVE-2025-6734
Severity: Critical, CVSS Severity Score 8.8
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: Potential system compromise, data leakage
Affected Products
Escape the Surveillance Era
Most apps won’t tell you the truth.
They’re part of the problem.
Phone numbers. Emails. Profiles. Logs.
It’s all fuel for surveillance.
Ameeba Chat gives you a way out.
- • No phone number
- • No email
- • No personal info
- • Anonymous aliases
- • End-to-end encrypted
Chat without a trace.
Product | Affected Versions
UTT HiPER 840G | up to 3.1.1-190328
How the Exploit Works
The vulnerability resides in the function sub_484E40 of the file /goform/formP2PLimitConfig in the API component of the UTT HiPER 840G. It stems from a buffer overflow condition that occurs when the ‘except’ argument is manipulated. This can lead to an overflow of the data buffer, and since the system does not correctly validate the size of the input, an attacker can overflow the buffer with arbitrary code.
This vulnerability can be exploited remotely without any user interaction or elevated privileges. Once the buffer overflow occurs, the attacker can execute arbitrary code with the privileges of the process, leading to system compromise or data leakage.
Conceptual Example Code
The following conceptual example illustrates a potential exploit scenario. Note that this is a simplified representation and actual exploitation would require more complex code.
POST /goform/formP2PLimitConfig HTTP/1.1
Host: target.example.com
Content-Type: application/x-www-form-urlencoded
except=AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA...In this example, the ‘except’ argument is overloaded with a large number of ‘A’ characters, which could overflow the buffer and potentially allow the execution of arbitrary code.
To mitigate this vulnerability, users are advised to apply the vendor’s patch as soon as it becomes available. In the meantime, using a Web Application Firewall (WAF) or Intrusion Detection System (IDS) may provide temporary mitigation against potential exploits.