Executive Summary

CVE-2026-2137 is a critical buffer overflow vulnerability found in the Tenda TX3 router running firmware up to version 16.03.13.11_multi.

The flaw exists in an unspecified function within the file path /goform/SetIpMacBind, where improper handling of the argument list leads to a buffer overflow condition.

Specifically, an input buffer is copied to an output buffer without verifying that the input size is smaller than the output buffer size, causing the overflow.

This vulnerability can be exploited remotely without local access or physical interaction.

The vulnerability is classified under CWE-120 (Classic Buffer Overflow) and relates to CWE-119.

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Impact Analysis

Exploitation of this vulnerability can impact the confidentiality, integrity, and availability of the affected device.

An attacker can remotely exploit the buffer overflow to potentially execute arbitrary code or cause a denial of service condition.

Since the exploit is publicly available, the risk of active exploitation is high.

No known mitigations or countermeasures have been identified, so the recommended action is to replace the affected product with an alternative.

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Compliance Impact

I don't know

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Detection Guidance

[{'type': 'paragraph', 'content': 'This vulnerability is triggered via the HTTP route /goform/SetIpMacBind on Tenda TX3 routers running firmware up to version 16.03.13.11_multi.'}, {'type': 'paragraph', 'content': 'Detection can involve monitoring HTTP requests to the /goform/SetIpMacBind endpoint for unusual or malformed argument lists that could lead to buffer overflow attempts.'}, {'type': 'paragraph', 'content': 'Since the exploit details and proof-of-concept are publicly available, network intrusion detection systems (NIDS) or web application firewalls (WAF) can be configured to detect or block suspicious requests targeting this endpoint.'}, {'type': 'paragraph', 'content': "Specific commands are not provided in the available resources, but you can use tools like curl or wget to manually test the endpoint by sending crafted HTTP requests to /goform/SetIpMacBind and observe the router's response or crashes."}] [1, 2, 3]

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Mitigation Strategies

[{'type': 'paragraph', 'content': 'No known mitigations or countermeasures have been identified for this vulnerability.'}, {'type': 'paragraph', 'content': 'The recommended immediate step is to replace the affected Tenda TX3 router with an alternative device that is not vulnerable.'}, {'type': 'paragraph', 'content': "Additionally, restricting remote access to the router's management interface and monitoring for suspicious activity targeting the /goform/SetIpMacBind endpoint may help reduce risk until replacement."}] [2]

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