Impact Analysis

Exploiting this vulnerability can lead to a denial of service (DoS) on the affected device or potentially allow an attacker to execute arbitrary remote code. This means an attacker could crash the router or take control of it remotely, leading to disruption of network services or unauthorized access.

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Compliance Impact

The provided information does not specify any direct impact of this vulnerability on compliance with common standards and regulations such as GDPR or HIPAA.

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Executive Summary

CVE-2026-7019 is a stack-based buffer overflow vulnerability in the Tenda F456 router version 1.0.0.5. It exists in the function fromP2pListFilter within the HTTP daemon, specifically in the handling of a user-supplied parameter named "page". This parameter is copied into a buffer using the sprintf function without proper bounds checking, which allows an attacker to overflow the stack buffer.

An attacker can exploit this vulnerability remotely by sending a specially crafted HTTP POST request to the /goform/P2pListFilter endpoint with an excessively long "page" parameter, causing the buffer overflow.

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Detection Guidance

This vulnerability can be detected by monitoring for suspicious HTTP POST requests sent to the endpoint /goform/P2pListFilter with an unusually long or crafted "page" parameter. Such requests may indicate attempts to exploit the stack-based buffer overflow.

A detection method involves capturing and inspecting HTTP traffic to the Tenda F456 router, specifically looking for POST requests targeting /goform/P2pListFilter.

Example command using curl to test the vulnerability by sending a crafted request (for detection or testing purposes):

• curl -X POST http://[router_ip]/goform/P2pListFilter -d "page=$(python3 -c 'print("A"*1000)')"

Network administrators can also use packet capture tools like tcpdump or Wireshark to filter and analyze HTTP POST requests to /goform/P2pListFilter for abnormal payload sizes.

• tcpdump -i [interface] -A 'tcp port 80 and (((ip[2:2] - ((ip[0]&0xf)<<2)) - ((tcp[12]&0xf0)>>2)) != 0)' | grep '/goform/P2pListFilter'

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Mitigation Strategies

Immediate mitigation steps include restricting access to the vulnerable endpoint /goform/P2pListFilter by implementing firewall rules or access control lists to block unauthorized or external HTTP POST requests to this path.

If possible, disable remote management or HTTP access to the router from untrusted networks to reduce exposure.

Monitor the device for unusual behavior or crashes that may indicate exploitation attempts.

Apply any available firmware updates or patches from the vendor that address this vulnerability once released.

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