CVE-2025-29137
CVE-2025-29137: Tenda AC7 V1.0 V15.03.06.44 Buffer Overflow in form_fast_setting_wifi_set
Description:
CVE-2025-29137 identifies a critical buffer overflow vulnerability in the Tenda AC7 V1.0 router, firmware version V15.03.06.44. The vulnerability exists within the form_fast_setting_wifi_set function, specifically related to the processing of the timeZone parameter. An attacker can exploit this vulnerability by providing an overly long timeZone string, overflowing the buffer allocated for it and potentially overwriting adjacent memory regions. This can lead to arbitrary code execution (RCE) on the device.
Severity:
- CVSS Score: 9.8 (Critical)
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Impact: Successful exploitation allows an attacker to execute arbitrary code on the router. This grants them complete control over the device, potentially enabling them to:
- Monitor and intercept network traffic.
- Modify router settings.
- Use the router as a pivot point for further attacks on the network.
- Install malware.
- Denial of service (DoS) by crashing the device.
Known Exploit:
While the provided data doesn’t explicitly state that a public exploit exists yet, the high CVSS score and the nature of a buffer overflow in firmware strongly suggest that an exploit can be readily developed. Buffer overflows are a well-understood class of vulnerabilities, and tools exist to automate the process of finding and exploiting them. Assume a proof-of-concept exploit will be developed and released soon if it hasn’t already.
Remediation / Mitigation Strategy:
Given the severity and the potential for imminent exploitation, the following steps are crucial:
Immediate Action: Firmware Update (If Available):
- The highest priority is to check for and install a firmware update from Tenda. Visit the Tenda website (www.tenda.com.cn) or use the router’s web interface to check for available updates. The update should address the buffer overflow vulnerability in
form_fast_setting_wifi_set. - Monitor Tenda’s security advisories: Subscribe to security alerts or regularly check Tenda’s website for updates regarding CVE-2025-29137.
- The highest priority is to check for and install a firmware update from Tenda. Visit the Tenda website (www.tenda.com.cn) or use the router’s web interface to check for available updates. The update should address the buffer overflow vulnerability in
Short-Term Mitigation (If No Firmware Update is Immediately Available):
- Disable Remote Management: If possible, disable remote access/management of the router. This prevents attackers from exploiting the vulnerability from outside the local network. This is usually found in the router’s administration panel.
- Change Default Credentials: Ensure that the router’s default administrator username and password have been changed to strong, unique values. This prevents attackers from easily accessing the router’s configuration.
- Network Segmentation (Advanced): If feasible, isolate the Tenda AC7 router on a separate network segment from more critical systems. This limits the impact of a potential compromise.
- Monitor Router Logs: Review the router’s logs for suspicious activity, such as repeated failed login attempts or unexpected network connections. While this might not prevent exploitation, it can help detect a compromise after it occurs.
Long-Term Measures:
- Router Replacement: If Tenda does not release a timely firmware update to address the vulnerability, consider replacing the Tenda AC7 router with a model from a vendor with a better security track record and a commitment to providing security updates.
- Regular Firmware Updates: Make it a practice to regularly check for and install firmware updates on all network devices, including routers, access points, and IoT devices. Enable automatic updates if available.
- Vulnerability Scanning: Implement regular vulnerability scanning of your network to identify and address potential security weaknesses.
Important Considerations:
- End-of-Life Devices: If the Tenda AC7 is an end-of-life (EOL) device, Tenda may not release a firmware update. In this case, router replacement is the recommended course of action.
- Compromised Router: If you suspect that the router has already been compromised, consider performing a factory reset to revert it to its default configuration. However, be aware that this will erase all custom settings and may not completely remove malware. After the reset, immediately change the default credentials and apply any available firmware updates. Monitoring network traffic after the reset is also recommended to check for lingering malicious activity. Ideally, replace the router.
Disclaimer: This remediation strategy is based on the information provided and general security best practices. It is essential to consult Tenda’s official documentation and security advisories for the most accurate and up-to-date guidance. This information is for educational purposes and does not constitute professional security advice.
Assigner
- MITRE [email protected]
Date
- Published Date: 2025-03-19 16:15:32
- Updated Date: 2025-03-19 21:15:41