CVE-2025-29462

Comprehensive Technical Analysis of CVE-2025-29462

1. Vulnerability Assessment and Severity Evaluation

CVE ID: CVE-2025-29462 Description: A buffer overflow vulnerability has been discovered in Tenda Ac15 V15.13.07.13. The vulnerability occurs when the webCgiGetUploadFile function calls the socketRead function to process HTTP request messages, resulting in the overwriting of a buffer on the stack.

CVSS Score: 9.8 Severity: Critical

The CVSS score of 9.8 indicates a critical vulnerability. This high score is due to the potential for remote code execution, which can lead to complete system compromise. The vulnerability allows an attacker to execute arbitrary code with the privileges of the affected process, potentially leading to unauthorized access, data breaches, and further system exploitation.

2. Potential Attack Vectors and Exploitation Methods

Attack Vectors:

• Remote Exploitation: An attacker can send a specially crafted HTTP request to the vulnerable device, triggering the buffer overflow.
• Network-Based Attacks: Since the vulnerability is in the HTTP request processing, it can be exploited over the network, making it accessible to remote attackers.

Exploitation Methods:

• Buffer Overflow: By sending a maliciously crafted HTTP request, an attacker can overwrite the buffer on the stack, leading to arbitrary code execution.
• Payload Delivery: The attacker can include a payload in the HTTP request that, when executed, performs malicious actions such as installing backdoors, exfiltrating data, or spreading malware.

3. Affected Systems and Software Versions

Affected Systems:

• Tenda Ac15 routers running firmware version V15.13.07.13.

Software Versions:

• Tenda Ac15 V15.13.07.13

It is crucial to note that other versions of the Tenda Ac15 firmware may also be affected if they share the same codebase. Users should verify the vulnerability status of their specific firmware version.

4. Recommended Mitigation Strategies

Immediate Actions:

• Firmware Update: Apply the latest firmware update provided by Tenda. Ensure that the update addresses the buffer overflow vulnerability.
• Network Segmentation: Isolate the affected devices from critical networks to limit the potential impact of an exploit.
• Firewall Rules: Implement strict firewall rules to restrict access to the web management interface of the router.

Long-Term Strategies:

• Regular Patching: Establish a regular patching schedule to ensure that all devices are updated with the latest security patches.
• Intrusion Detection Systems (IDS): Deploy IDS to monitor network traffic for suspicious activities that may indicate an exploitation attempt.
• Security Audits: Conduct regular security audits and vulnerability assessments to identify and mitigate potential vulnerabilities.

5. Impact on Cybersecurity Landscape

The discovery of CVE-2025-29462 highlights the ongoing risk of buffer overflow vulnerabilities in network devices. This vulnerability underscores the importance of robust security practices, including regular firmware updates and proactive monitoring. The potential for remote code execution makes this vulnerability particularly dangerous, as it can be exploited to gain unauthorized access to networks and sensitive data.

6. Technical Details for Security Professionals

Vulnerability Details:

• Function Involved: webCgiGetUploadFile and socketRead
• Trigger: The vulnerability is triggered when processing HTTP request messages, specifically during file upload operations.
• Buffer Overflow: The buffer on the stack is overwritten due to insufficient bounds checking in the socketRead function.

Exploitation Steps:

1. Crafting the Payload: An attacker crafts an HTTP request with a payload designed to overflow the buffer.
2. Sending the Request: The malicious HTTP request is sent to the vulnerable device.
3. Buffer Overflow: The socketRead function processes the request, leading to a buffer overflow.
4. Code Execution: The overflow allows the attacker to execute arbitrary code on the device.

Detection and Response:

• Log Analysis: Monitor logs for unusual HTTP request patterns that may indicate an exploitation attempt.
• Behavioral Analysis: Use behavioral analysis tools to detect anomalous activities on the network.
• Incident Response: Have an incident response plan in place to quickly address and mitigate any detected exploitation attempts.

In conclusion, CVE-2025-29462 represents a significant risk to organizations using Tenda Ac15 routers. Immediate mitigation steps, including firmware updates and network segmentation, are essential to protect against potential exploitation. Regular security audits and proactive monitoring are crucial for maintaining a robust cybersecurity posture.