Executive Summary

CVE-2026-36957 is a Denial of Service vulnerability in the Dbit N300 T1 Pro Easy Setup Wireless Wi-Fi Router firmware version V1.0.0. The vulnerability exists in the Boa web server's URI handler, which does not properly manage system resources when flooded with a high volume of HTTP GET requests to non-existent URIs.

This flood of requests exhausts critical system resources such as file descriptors and memory buffers, causing a kernel deadlock or system hang. As a result, the router's web management portal and all routing capabilities become unresponsive, requiring a manual reboot to restore functionality.

Useful 0 Not Useful 0

Impact Analysis

This vulnerability can significantly impact the availability of your Dbit N300 T1 Pro router by causing it to become unresponsive due to resource exhaustion.

• The router's web management portal will be disabled, preventing administrative access.
• All routing capabilities of the device will be halted, disrupting network connectivity.
• Recovery requires a manual reboot, which may cause downtime and service interruption.

Useful 0 Not Useful 0

Detection Guidance

This vulnerability can be detected by monitoring for a high volume of HTTP GET requests to non-existent URIs on the Dbit N300 T1 Pro Easy Setup Wireless Wi-Fi Router running firmware version V1.0.0. An unusual flood of such requests may indicate an ongoing attack exploiting the Boa web server URI handler.

A proof of concept involves spawning multiple threads to send requests to non-existent URIs, which causes the router to crash. To detect this, you can use network monitoring tools or commands that capture HTTP traffic and analyze request patterns.

• Use tcpdump or Wireshark to capture HTTP GET requests and filter for requests to non-existent URIs.
• Example tcpdump command: tcpdump -i <interface> 'tcp port 80 and (((ip[2:2] - ((ip[0]&0xf)<<2)) - ((tcp[12]&0xf0)>>2)) != 0)' -w capture.pcap
• Analyze captured traffic for repeated GET requests to unusual or non-existent paths.
• Monitor router logs for signs of resource exhaustion or system hangs related to the web management portal becoming unresponsive.

Useful 0 Not Useful 0

Mitigation Strategies

Immediate mitigation steps include implementing connection rate limiting to prevent high-volume floods of HTTP GET requests to non-existent URIs.

Additional measures involve adding watchdog timers to detect and recover from system hangs and restricting the maximum number of concurrent connections per IP address to reduce resource exhaustion.

If the router becomes unresponsive due to this attack, a manual reboot is required to restore functionality.

Useful 0 Not Useful 0

Compliance Impact

The vulnerability in the Dbit N300 T1 Pro Easy Setup Wireless Wi-Fi Router causes a Denial of Service by exhausting system resources, leading to a system hang or kernel deadlock that disables the web management portal and routing capabilities.

This impacts the availability of the device but does not affect confidentiality or integrity of data.

Since the vulnerability does not compromise data confidentiality or integrity, it primarily affects availability requirements in standards like GDPR and HIPAA.

Disruptions in availability could lead to non-compliance with regulations that require continuous access to network services or timely access to data, but there is no direct indication that personal data is exposed or altered.

Useful 0 Not Useful 0