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April 8, 2025
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How to Fix CVE-2025-3328: Critical Buffer Overflow Vulnerability in Tenda AC1206 Router Firmware?
A critical buffer overflow vulnerability has been identified in the Tenda AC1206 router, potentially allowing attackers to execute arbitrary code remotely. This vulnerability, tracked as CVE-2025-3328, poses a significant risk to network security, potentially leading to complete device compromise. This article provides security professionals with a detailed analysis of the flaw, including its impact, affected versions, and practical steps to mitigate or remediate it. Our goal is to equip you with the information necessary to safeguard your network infrastructure against this vulnerability.
A Short Introduction to Tenda AC1206 Router
The Tenda AC1206 is a dual-band Gigabit wireless router designed for home and small office use. It supports the 802.11ac Wave 2 standard, offering combined wireless speeds of up to 1200Mbps. The router features four external antennas for enhanced Wi-Fi coverage and signal strength. Its key functionalities include wireless routing, parental controls, guest network setup, and VPN server capabilities, making it a common choice for users seeking reliable and affordable network connectivity.
Summary of CVE-2025-3328
CVE ID: CVE-2025-3328
Description: Buffer overflow vulnerability in the
form_fast_setting_wifi_setfunction of the Tenda AC1206 router firmware, triggered by manipulating thessid/timeZonearguments.CVSS Score: 8.7 (High)
CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
This vulnerability exists within the form_fast_setting_wifi_set function in the Tenda AC1206 router firmware version 15.03.06.23. The flaw stems from a lack of proper bounds checking when handling the ssid and timeZone arguments. An attacker can exploit this by crafting a malicious request with overly long strings for these parameters, causing a buffer overflow. This overflow can then be leveraged to overwrite adjacent memory regions, potentially leading to arbitrary code execution on the router. The relatively low privileges required for exploitation and the absence of user interaction make this a particularly dangerous vulnerability.
Impact of CVE-2025-3328
Successful exploitation of CVE-2025-3328 can have severe consequences:
Arbitrary Code Execution: Attackers can execute malicious code on the affected router, gaining complete control over the device.
Compromised Router Integrity: The integrity of the router can be compromised, allowing attackers to modify its configuration and functionality.
Unauthorized Network Access: Attackers can gain unauthorized access to network resources behind the router, potentially compromising sensitive data and systems.
Network Device Control: The attacker can take complete control of the network device, using it as a pivot point for further attacks within the network.
The high impact on confidentiality, integrity, and availability makes this a critical vulnerability requiring immediate attention. A compromised router can serve as an entry point for attackers to infiltrate the entire network, highlighting the importance of prompt remediation.
Products Affected by the Vulnerability
The following product and version are affected by the buffer overflow vulnerability:
| Product | Version | Vulnerable |
|---|---|---|
| Tenda AC1206 | 15.03.06.23 | Yes |
It is crucial to verify the firmware version of your Tenda AC1206 router to determine if it is affected by this vulnerability. No non-affected products are explicitly mentioned in the provided information.
How to Check Your Product is Vulnerable?
To determine if your Tenda AC1206 router is vulnerable, follow these steps:
Access the Router's Web Interface: Open a web browser and enter the router's IP address (usually 192.168.0.1 or 192.168.1.1).
Log In: Enter your administrator username and password.
Locate Firmware Information: Navigate to the "System Information" or "Administration" section of the web interface. Look for the "Firmware Version" or "Software Version" field.
Check the Version: Verify that the firmware version is 15.03.06.23. If it is, your router is vulnerable to CVE-2025-3328.
Monitor Network Traffic: Analyze network traffic for suspicious patterns, particularly long strings being passed in the
ssidortimeZonearguments to the/goform/fast_setting_wifi_setendpoint.
How to Fix the Vulnerability?
At this time, the primary remediation strategy involves updating the router's firmware. If a patch is not yet available, consider the following mitigation steps:
Isolate or Disconnect: Immediately isolate or disconnect affected Tenda AC1206 routers from the network to prevent potential exploitation.
Firmware Updates: Regularly check for and apply any available firmware updates from Tenda. This is the most effective way to address the vulnerability.
Restrict Access: Block router management interfaces from external access. Ensure that the web interface is only accessible from the local network.
Network Segmentation: Implement strict network segmentation to limit the potential impact of a compromised router.
Firewall Rules: Use firewall rules to restrict access to the router from untrusted networks.
Monitoring: Continuously monitor network traffic for potential exploit attempts targeting this vulnerability.
As there's no specific mention of an available patch, it is essential to monitor official Tenda channels for security updates or patches related to this vulnerability. Prioritize applying the patch as soon as it is released to fully address the buffer overflow flaw.
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Arun KL
Arun KL is a cybersecurity professional with 15+ years of experience in IT infrastructure, cloud security, vulnerability management, Penetration Testing, security operations, and incident response. He is adept at designing and implementing robust security solutions to safeguard systems and data. Arun holds multiple industry certifications including CCNA, CCNA Security, RHCE, CEH, and AWS Security.
