| Title | Tenda RX3 V16.03.13.11 Stack-based Buffer Overflow |
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| Description | During a security review of the Tenda RX3 router firmware (version V16.03.13.11), a critical stack-based buffer overflow vulnerability was identified in the Wi-Fi configuration endpoint /goform/fast_setting_wifi_set.
The vulnerability exists within the form_fast_setting_wifi_set function. This function retrieves the user-controlled parameter ssid via the websGetVar interface and processes it into a fixed-size stack buffer ssid_5g (64 bytes). Due to the use of the unsafe sprintf function without length validation, an attacker can provide an overly long SSID to overwrite the stack, leading to a Denial of Service (DoS) or arbitrary code execution with root privileges. |
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| Source | ⚠️ https://github.com/LX-66-LX/cve-new/issues/4 |
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| User | LX-66-LX (UID 92717) |
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| Submission | 01/31/2026 10:41 (3 months ago) |
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| Moderation | 02/07/2026 16:19 (7 days later) |
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| Status | Accepted |
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| VulDB entry | 344883 [Tenda RX3 16.03.13.11 fast_setting_wifi_set ssid_5g stack-based overflow] |
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| Points | 20 |
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