Executive Summary

[{'type': 'paragraph', 'content': 'CVE-2026-30140 is an information disclosure vulnerability affecting Tenda W15E routers running firmware version V02.03.01.26_cn.'}, {'type': 'paragraph', 'content': "An unauthenticated attacker can access a specific URL endpoint, /cgi-bin/DownloadCfg/RouterCfm.jpg, which despite its .jpg extension, returns the router's configuration file."}, {'type': 'paragraph', 'content': 'This configuration file contains sensitive information such as plaintext administrator credentials, Wi-Fi passwords, and PPPoE passwords.'}, {'type': 'paragraph', 'content': "The attacker can download this file by sending a simple HTTP GET request to the vulnerable endpoint on the router's IP address."}, {'type': 'paragraph', 'content': 'After downloading, the attacker can decode the file to extract these sensitive credentials.'}] [1]

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Impact Analysis

This vulnerability can have severe impacts as it allows an attacker to obtain administrative and Wi-Fi passwords from the affected router.

With these credentials, an attacker can gain remote administrative access to the router, potentially leading to full system compromise.

Such access can enable the attacker to manipulate network settings, intercept or redirect traffic, and compromise connected devices.

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Compliance Impact

I don't know

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Detection Guidance

[{'type': 'paragraph', 'content': 'This vulnerability can be detected by sending an HTTP GET request to the specific vulnerable endpoint on the target router.'}, {'type': 'paragraph', 'content': 'For example, you can use the following curl command to check if the router is vulnerable by attempting to download the configuration file:'}, {'type': 'list_item', 'content': 'curl -v http://<Target_IP>/cgi-bin/DownloadCfg/RouterCfm.jpg'}, {'type': 'paragraph', 'content': "Replace <Target_IP> with the router's IP address, typically accessed on port 80 or 8899. If the request returns a configuration file (instead of a typical image), the device is vulnerable."}, {'type': 'paragraph', 'content': 'After downloading, you may Base64 decode the file to extract sensitive credentials such as the administrator password.'}] [1]

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Mitigation Strategies

I don't know

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