| Title | Tenda CX12L V16.03.53.12 Stack-based Buffer Overflow |
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| Description | During a security review of the Tenda CX12L router firmware (version V16.03.53.12), 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/cve-a/moist/issues/1 |
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| User | moist (UID 98412) |
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| Submission | 05/22/2026 09:42 (19 days ago) |
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| Moderation | 06/07/2026 16:01 (16 days later) |
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| Status | Accepted |
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| VulDB entry | 369123 [Tenda CX12L 16.03.53.12 Wi-Fi Configuration Endpoint fast_setting_wifi_set form_fast_setting_wifi_set ssid stack-based overflow] |
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| Points | 20 |
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