Author: Ameeba

Overview

The cybersecurity landscape is constantly evolving, with new vulnerabilities being discovered and exploited on a regular basis. One such vulnerability, CVE-2025-5862, is a critical issue found within Tenda AC7 15.03.06.44. The vulnerability affects the function formSetPPTPUserList of the file /goform/setPptpUserList. This vulnerability stands out due to its critical severity and the potential it possesses for system compromise and data leakage.
As the vulnerability can be exploited remotely, it poses a significant threat to the integrity of systems running on the affected Tenda AC7 version. It is vital for users and administrators to understand this vulnerability and take appropriate steps to mitigate its potential impact.

Vulnerability Summary

CVE ID: CVE-2025-5862
Severity: Critical – CVSS Score 8.8
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: Potential system compromise or data leakage

Affected Products

Product | Affected Versions

Tenda AC7 | 15.03.06.44

How the Exploit Works

The vulnerability arises from a buffer overflow condition in the formSetPPTPUserList function of the /goform/setPptpUserList file. Buffer overflow is a common type of security vulnerability that is caused by writing data to a buffer and exceeding that buffer’s boundary and overwriting adjacent memory. This can result in erratic program behavior, including memory access errors, incorrect results, program termination, or a breach of system security.
In the case of CVE-2025-5862, the manipulation of the argument list in the affected function leads to the buffer overflow. With a carefully crafted payload, an attacker can trigger the overflow and execute arbitrary code on the system. This vulnerability can be exploited remotely, without user interaction or privileges.

Conceptual Example Code

Below is a hypothetical example of how this vulnerability could potentially be exploited. This is a conceptual demonstration only and does not represent actual exploit code.

POST /goform/setPptpUserList HTTP/1.1
Host: affected-device-ip
Content-Type: application/x-www-form-urlencoded
argument_list=AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA...[continue until buffer overflow]

In this example, the `argument_list` parameter is filled with an excessive amount of ‘A’ characters, causing a buffer overflow. In an actual attack scenario, the ‘A’ characters would be replaced with a carefully crafted payload designed to execute arbitrary code on the system.

Overview

A critical vulnerability identified as CVE-2025-5861 has been discovered in Tenda AC7 15.03.06.44. This vulnerability specifically affects the function fromadvsetlanip of the file /goform/AdvSetLanip. It matters because the vulnerability, which arises from the manipulation of the argument lanMask, leads to a buffer overflow. This can potentially compromise the system or cause data leakage. Furthermore, the exploit can be initiated remotely and has already been disclosed to the public, which increases the likelihood of its misuse.

Vulnerability Summary

CVE ID: CVE-2025-5861
Severity: Critical, CVSS 8.8
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: System compromise or data leakage

Affected Products

Product | Affected Versions

Tenda AC7 | 15.03.06.44

How the Exploit Works

The exploit works by manipulating the argument lanMask that is part of the fromadvsetlanip function in the /goform/AdvSetLanip file. This manipulation leads to a buffer overflow, which in computing terms means that more data is put into a buffer than it can handle. This overflow can overwrite adjacent memory locations, potentially leading to erratic program behavior, system crashes, or a breach of system security.

Conceptual Example Code

Here is a conceptual example of how the vulnerability might be exploited:

POST /goform/AdvSetLanip HTTP/1.1
Host: target.example.com
Content-Type: application/json
{ "lanMask": "256.256.256.256" } // This is an invalid IP address used to trigger buffer overflow

In this example, an invalid IP address is used as the lanMask argument to trigger the buffer overflow. It’s important to note that this is a simplified representation and the real-world exploit might require more complex manipulation.

Mitigation and Remediation

The best way to mitigate this vulnerability is to apply the vendor patch. If the patch is not available or cannot be applied immediately, a temporary mitigation could be to use a Web Application Firewall (WAF) or Intrusion Detection System (IDS) to monitor traffic and block any suspicious activity related to this exploit. Regularly updating and patching your systems and software is a good general practice to reduce the risk of such vulnerabilities.

Overview

The cybersecurity landscape is always evolving, and vulnerabilities can pop up in even the most unexpected places. One such vulnerability, identified as CVE-2025-5855, has been discovered in the Tenda AC6 15.03.05.16. This critical vulnerability, which pertains to the function formSetRebootTimer of the file /goform/SetRebootTimer, can potentially lead to a system compromise or even data leakage. Given the severity of the exploit and its ability to be initiated remotely, it’s crucial that users understand the vulnerability and take appropriate steps to mitigate its effects.

Vulnerability Summary

CVE ID: CVE-2025-5855
Severity: Critical – CVSS 8.8
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: System compromise or data leakage

Affected Products

Product | Affected Versions

Tenda AC6 | 15.03.05.16

How the Exploit Works

This vulnerability is a stack-based buffer overflow vulnerability, meaning it involves the overflowing of a memory space called a stack. In this case, the manipulation of the argument rebootTime in the function formSetRebootTimer leads to this overflow. By supplying an excessively long value for rebootTime, an attacker can overflow the buffer, and overwrite adjacent memory locations.
The danger lies in the fact that overwritten memory may contain executable code, which can be replaced with malicious instructions. This can result in a variety of negative outcomes, ranging from program crashes to the execution of arbitrary code, potentially granting the attacker control over the system.

Conceptual Example Code

The following conceptual example illustrates how an attacker might exploit this vulnerability in a HTTP request:

POST /goform/SetRebootTimer HTTP/1.1
Host: target.example.com
Content-Type: application/json
{ "rebootTime": "VeryLongStringToOverflowBuffer..." }

In this example, the string assigned to “rebootTime” is excessively long, intended to overflow the buffer and potentially overwrite important data or executable code. The specifics of the string would depend on the exact nature of the vulnerability and the attacker’s goal.

Countermeasures

The best way to mitigate this vulnerability is to apply the vendor patch. In scenarios where this is not immediately possible, the use of a Web Application Firewall (WAF) or Intrusion Detection System (IDS) could provide temporary mitigation.
It’s important to note that these are only temporary solutions. They may not completely prevent exploitation and may have other adverse effects on system performance or functionality. Therefore, applying the vendor patch as soon as feasible remains the best way to secure systems against the CVE-2025-5855 vulnerability.

Overview

A critical vulnerability has been discovered in the formSetPPTPUserList function of the file /goform/setPptpUserList in Tenda AC6 15.03.05.16. This vulnerability has been given the identification CVE-2025-5852 and poses a significant threat to user data and system integrity. This vulnerability matters due to the severity of its potential impact; it can be exploited remotely and could potentially lead to system compromise or data leakage.

Vulnerability Summary

CVE ID: CVE-2025-5852
Severity: Critical (CVSS: 8.8)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: Potential system compromise or data leakage

Affected Products

Product | Affected Versions

Tenda AC6 | 15.03.05.16

How the Exploit Works

The vulnerability exploits a buffer overflow condition in the formSetPPTPUserList function of the file /goform/setPptpUserList. The manipulation of the argument list can cause the system to write data beyond the intended boundary of a fixed-length buffer. This can corrupt data, crash the system, or lead to the execution of malicious code.

Conceptual Example Code

The following is a conceptual example that demonstrates how the vulnerability might be exploited. This example should not be used for malicious purposes.

POST /goform/setPptpUserList HTTP/1.1
Host: target.example.com
Content-Type: application/json
{ "user_list": "A"*10000 }

In the example above, the user_list argument is filled with a large number of ‘A’ characters, which could overflow the buffer and lead to unexpected behavior, such as the execution of malicious code.

Mitigation

To mitigate this vulnerability, users are recommended to apply the vendor patch as soon as it becomes available. In the interim, using a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can provide temporary mitigation. Regularly updating and patching systems can help prevent exploitation of such vulnerabilities.

Overview

CVE-2025-5851 is a critical vulnerability that has been discovered in Tenda AC15 15.03.05.19_multi. This vulnerability is potentially devastating as it allows for a buffer overflow attack, which could lead to system compromise or data leakage. Given that the exploit has been publicly disclosed, it is of utmost importance that affected systems apply the necessary patches or mitigation measures to protect against this vulnerability.
This vulnerability not only affects individual users but also poses a significant threat to organizations using the Tenda AC15 15.03.05.19_multi. The risk of a successful exploit can lead to unauthorized access, alteration, or even deletion of data, which could have devastating consequences for businesses.

Vulnerability Summary

CVE ID: CVE-2025-5851
Severity: Critical (8.8/10 on CVSS)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: Potential system compromise or data leakage

Affected Products

Product | Affected Versions

Tenda AC15 | 15.03.05.19_multi

How the Exploit Works

The vulnerability is found in the HTTP POST Request Handler component of the Tenda AC15 15.03.05.19_multi, specifically in the function fromadvsetlanip of the file /goform/AdvSetLanip. The manipulation of the argument lanMask leads to a buffer overflow. This means that an attacker can send a specially crafted HTTP POST request, which exceeds the expected data size, to overflow the buffer and execute arbitrary code or crash the system.

Conceptual Example Code

Here is a conceptual example of how an attacker might exploit this vulnerability using a malicious HTTP POST request:

POST /goform/AdvSetLanip HTTP/1.1
Host: target.example.com
Content-Type: application/x-www-form-urlencoded
lanMask=255.255.255.0&lanIp=192.168.0.1&lanMask=AAAA...[long string of A's to overflow buffer]

The above example demonstrates a long string of “A” characters used to overflow the buffer. This is a typical method used in buffer overflow attacks. Please note that this is a simplified representation and actual exploit code would likely involve more complex manipulations.

Mitigation and Patching

Given the severity of this vulnerability, it is recommended that users apply the vendor patch as soon as possible. If the patch cannot be applied immediately, using a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can provide temporary mitigation.
Regularly updating and patching systems, as well as monitoring network traffic for unusual activity, can also help to prevent successful exploits of this vulnerability.

Overview

A critical vulnerability, termed as CVE-2025-5850, has been identified in Tenda AC15 version 15.03.05.19_multi. This vulnerability, upon successful exploitation, has the potential to compromise the entire system and may result in sensitive data leakage. Given the severity of the issue and the high CVSS score, it is pivotal for all users of the affected system to apply the necessary patches and secure their systems. This article provides a comprehensive analysis of this vulnerability, its potential impact, and the steps that can be taken for mitigation.

Vulnerability Summary

CVE ID: CVE-2025-5850
Severity: Critical (8.8 CVSS Severity Score)
Attack Vector: Remote
Privileges Required: Low
User Interaction: Required
Impact: Potential system compromise and data leakage

Affected Products

Product | Affected Versions

Tenda AC15 | 15.03.05.19_multi

How the Exploit Works

The vulnerability originates from the improper handling of the ‘Time’ argument within the ‘formsetschedled’ function in the ‘/goform/SetLEDCf’ file. A malicious actor can manipulate this argument to trigger a buffer overflow condition. This overflow condition can be exploited to execute arbitrary code on the system or even potentially gain full control of the system. Moreover, this attack can be initiated remotely, which exponentially increases the risk factor.

Conceptual Example Code

Here’s a conceptual example that demonstrates how a malicious HTTP POST request might be used to exploit this vulnerability. Please note that this is a simplified example and actual exploit code may vary significantly.

POST /goform/SetLEDCf HTTP/1.1
Host: target.IP.address
Content-Type: application/x-www-form-urlencoded
Time=AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA...

In this example, the ‘Time’ parameter is filled with a long string of ‘A’ characters, causing the buffer to overflow and potentially allowing the execution of arbitrary code.

Mitigation

The best course of action is to apply the vendor patch to patch the vulnerability as soon as possible. However, if you’re unable to apply the patch immediately, using a Web Application Firewall (WAF) or an Intrusion Detection System (IDS) can provide temporary mitigation. These systems can detect and block malicious requests, thereby preventing the exploitation of the vulnerability.