CVE-2025-14526

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CVE-2025-14526 vulnerability security high severity Tenda CH22 buffer overflow remote exploitation CVE database

Summary

CVE-2025-14526 describes a critical buffer overflow vulnerability found in Tenda CH22 firmware version 1.0.0.1. This vulnerability resides within the frmL7ImForm function of the /goform/L7Im file and can be triggered by manipulating the page argument. Successful exploitation allows remote attackers to potentially execute arbitrary code or cause a denial-of-service condition.

Technical Details

CVE-2025-14526 is a buffer overflow vulnerability. The frmL7ImForm function in the /goform/L7Im file of Tenda CH22 firmware version 1.0.0.1 is susceptible to this flaw. The vulnerability occurs because the function does not properly validate the size of the input provided through the page argument. When an attacker provides an input string larger than the allocated buffer size, it overflows, potentially overwriting adjacent memory regions. This can lead to code execution if the overwritten memory contains executable code or function pointers. The vulnerability is triggered through a crafted HTTP request to the /goform/L7Im endpoint, specifically targeting the page parameter. Due to the lack of input validation, a remote attacker can exploit this vulnerability without requiring authentication, making it particularly dangerous. The publicly available exploit code further increases the risk of widespread exploitation.

The root cause lies in the insufficient bounds checking when handling the page parameter. The application fails to ensure that the data being written to the buffer does not exceed its capacity. This classic buffer overflow scenario allows an attacker to overwrite memory beyond the intended boundaries, potentially gaining control of the system.

Affected Products and Versions

The following product and version are known to be affected by CVE-2025-14526:

  • Tenda CH22 Firmware Version 1.0.0.1

Impact Assessment

Successful exploitation of CVE-2025-14526 can have severe consequences:

  • Remote Code Execution (RCE): An attacker can potentially execute arbitrary code on the affected device, gaining full control of the system. This allows them to install malware, steal sensitive data, or use the device as part of a botnet.
  • Denial of Service (DoS): The buffer overflow can cause the device to crash or become unresponsive, leading to a denial-of-service condition. This disrupts the device's normal functionality and can impact network connectivity.
  • Data Breach Risk: If the attacker gains control of the device, they can potentially access and exfiltrate sensitive data stored on the device or transmitted through it.
  • System Compromise: The entire system can be compromised, leading to further attacks on other devices on the network.

Remediation

Addressing CVE-2025-14526 requires immediate attention to mitigate the risk of exploitation.

Immediate Actions

  • Apply Firmware Update (If Available): Check the Tenda website for a firmware update that addresses this vulnerability. Applying the update is the most effective way to resolve the issue.
  • Monitor Network Traffic: Monitor network traffic for suspicious activity, such as unusual requests to the /goform/L7Im endpoint.
  • Isolate Affected Devices: If possible, isolate affected Tenda CH22 devices from the network to prevent further compromise.

Long-term Solutions

  • Implement Input Validation: Tenda should implement proper input validation and sanitization to prevent buffer overflows in future firmware releases.
  • Regular Security Audits: Conduct regular security audits and penetration testing to identify and address potential vulnerabilities.

References

The following resources provide additional information about CVE-2025-14526:

Detection & Scanning

Detecting CVE-2025-14526 requires careful analysis of network traffic and system logs. Look for suspicious requests to the /goform/L7Im endpoint with abnormally long page parameter values. Intrusion detection systems (IDS) and intrusion prevention systems (IPS) can be configured to detect and block such requests.

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