Overview
A high-severity security vulnerability, identified as CVE-2025-13288, has been discovered in Tenda CH22 version 1.0.0.1 routers. This vulnerability exposes the router to remote attacks due to a buffer overflow in the fromPptpUserSetting function within the /goform/PPTPUserSetting file. Public exploits are available, increasing the urgency for users to apply mitigations.
Technical Details
The vulnerability stems from insufficient input validation when handling the delno argument in the fromPptpUserSetting function. By crafting a malicious request with an overly long delno value, attackers can overwrite memory buffers, potentially leading to arbitrary code execution or denial-of-service conditions. The attack can be performed remotely, making vulnerable routers prime targets for malicious actors.
CVSS Analysis
This vulnerability has been assigned a CVSS score of 8.8, indicating a high severity. This score reflects the potential for significant impact, the ease of exploitation due to public availability of exploits, and the remote attack vector. A high CVSS score emphasizes the critical need for immediate patching or mitigation.
Possible Impact
Successful exploitation of this vulnerability could have severe consequences, including:
- Remote Code Execution: Attackers could execute arbitrary code on the router, potentially gaining full control of the device.
- Denial of Service (DoS): The router could be rendered unusable, disrupting network connectivity for all connected devices.
- Data Exfiltration: Attackers could potentially access sensitive data stored on or transmitted through the router.
- Network Compromise: A compromised router could be used as a springboard for further attacks on other devices within the network.
Mitigation or Patch Steps
Unfortunately, as of this writing, a patch has not been released by Tenda. Here are some immediate steps you can take to mitigate the risk:
- Disable PPTP: If you are not actively using PPTP, disable it in your router’s settings. This will eliminate the attack vector.
- Restrict Access: Limit access to the router’s web interface to only trusted devices within your local network. Avoid exposing the management interface to the public internet.
- Monitor Network Traffic: Closely monitor your network traffic for any suspicious activity.
- Firewall: Ensure your firewall is properly configured to block unauthorized access to your network.
- Contact Tenda Support: Reach out to Tenda Support to inquire about a patch release and express your concern regarding this vulnerability.
- Consider Alternative Routers: If a patch is not released promptly, strongly consider replacing the Tenda CH22 router with a more secure alternative from a different vendor.
Important: Regularly check the Tenda website for firmware updates related to this vulnerability.
References
GitHub Exploit Disclosure
VulDB Entry: CVE-2025-13288
VulDB Exploit Details
VulDB Submission
Tenda Official Website
