Executive Summary

[{'type': 'paragraph', 'content': 'CVE-2026-3168 is a critical buffer overflow vulnerability in the Tenda F453 router firmware version 1.0.0.3. It occurs in the function fromNatStaticSetting within the httpd component, specifically in the /goform/NatStaticSetting endpoint. The vulnerability arises because the argument "page" is improperly handled, allowing an attacker to manipulate input data that overflows the buffer by copying data without verifying the input size against the output buffer size.'}, {'type': 'paragraph', 'content': 'This buffer overflow can be exploited remotely without authentication, potentially allowing an attacker to execute arbitrary code or cause a denial of service on the device.'}] [1, 3]

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Impact Analysis

This vulnerability can have severe impacts including remote code execution and denial of service on the affected Tenda F453 router. An attacker exploiting this flaw can compromise the confidentiality, integrity, and availability of the device.

• Remote attackers can exploit the vulnerability without any local access or authentication.
• Compromise of device functionality, potentially disrupting network services.
• Execution of arbitrary code, which could lead to full control over the device.
• Denial of service conditions, making the device unavailable.

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Compliance Impact

I don't know

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Detection Guidance

[{'type': 'paragraph', 'content': 'The vulnerability affects the Tenda F453 router firmware version 1.0.0.3, specifically the /goform/NatStaticSetting endpoint in the httpd component. Detection would involve monitoring or testing for attempts to exploit the buffer overflow via manipulation of the "page" argument in requests to this endpoint.'}, {'type': 'paragraph', 'content': 'Since the exploit is publicly available, one could use crafted HTTP requests targeting the /goform/NatStaticSetting endpoint with manipulated "page" parameters to test if the device is vulnerable.'}, {'type': 'list_item', 'content': 'Use curl or similar tools to send HTTP POST requests to http://<router-ip>/goform/NatStaticSetting with varying "page" parameter values to observe abnormal behavior or crashes.'}, {'type': 'list_item', 'content': 'Example command: curl -X POST -d "page=<malicious_payload>" http://<router-ip>/goform/NatStaticSetting'}, {'type': 'list_item', 'content': 'Monitor network traffic for unusual POST requests to /goform/NatStaticSetting that include suspicious or oversized "page" parameters.'}] [1, 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 F453 router running firmware version 1.0.0.3 with an alternative device or firmware version that is not vulnerable.'}, {'type': 'paragraph', 'content': "Additionally, restricting remote access to the router's management interface and monitoring for exploit attempts may help reduce risk until replacement or patching is possible."}] [3]

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