Executive Summary

[{'type': 'paragraph', 'content': 'CVE-2026-2071 is a critical buffer overflow vulnerability found in the UTT 进取 520W device, version 1.7.7-180627. The flaw exists in the function strcpy within the file /goform/formP2PLimitConfig. It arises from improper handling of the argument "except," where data is copied without verifying that the input size fits into the output buffer, leading to a classic buffer overflow condition (CWE-120).'}, {'type': 'paragraph', 'content': 'This vulnerability can be exploited remotely by manipulating the "except" parameter, causing the buffer overflow. The exploit is publicly available, making it relatively easy for attackers to use.'}] [2, 3]

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Impact Analysis

[{'type': 'paragraph', 'content': "Exploiting this vulnerability can impact the affected device's confidentiality, integrity, and availability. Specifically, an attacker can cause a denial-of-service (DoS) attack against the router by triggering the buffer overflow."}, {'type': 'paragraph', 'content': 'Because the vulnerability is remotely exploitable and the exploit code is publicly available, attackers can easily leverage this flaw to disrupt device operation or potentially gain unauthorized control.'}] [2, 3]

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Compliance Impact

I don't know

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Detection Guidance

[{'type': 'paragraph', 'content': 'This vulnerability involves a buffer overflow in the strcpy function within the /goform/formP2PLimitConfig endpoint of the UTT 进取 520W router version 1.7.7-180627. Detection can focus on monitoring HTTP requests targeting this specific endpoint with suspicious or unusually long parameters, especially the "except" parameter.'}, {'type': 'paragraph', 'content': 'Network detection could involve capturing and analyzing HTTP traffic for requests to /goform/formP2PLimitConfig containing large or malformed payloads that might trigger the overflow.'}, {'type': 'paragraph', 'content': 'Suggested commands for detection might include using tools like curl or wget to test the endpoint, or network traffic analysis tools such as tcpdump or Wireshark to filter and inspect relevant traffic.'}, {'type': 'list_item', 'content': 'Use curl to send a test request to the vulnerable endpoint: curl -v http://<router-ip>/goform/formP2PLimitConfig -d "except=AAAA..." (with a long string to test for overflow)'}, {'type': 'list_item', 'content': 'Use tcpdump to capture HTTP traffic to the device: tcpdump -i <interface> host <router-ip> and port 80'}, {'type': 'list_item', 'content': 'Use Wireshark to filter HTTP POST requests to /goform/formP2PLimitConfig and inspect the payloads for suspicious content.'}] [2, 3]

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Mitigation Strategies

Currently, there are no known patches or vendor-provided mitigations for this vulnerability as the vendor did not respond to the disclosure.

Immediate mitigation steps include restricting access to the affected device, especially blocking remote HTTP access to the /goform/formP2PLimitConfig endpoint.

Consider isolating the device from untrusted networks and monitoring for exploit attempts.

If possible, replace the affected product with a secure alternative, as suggested by the vulnerability report.

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