| Título | Tenda A21 V1.0.0.1 Stack-based Buffer Overflow |
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| Descrição | During a security review of the Tenda A21 router firmware (version V1.0.0.0), a critical stack-based buffer overflow vulnerability was identified in the QoS (Quality of Service) configuration endpoint `/goform/formSetQosBand`.
The vulnerability is located in the `set_qosMib_list` function, which is called by the request handler `formSetQosBand`. The function receives a user-controlled `list` parameter. It searches for a delimiter and then uses the unsafe `strcpy` function to copy the contents of the list into a fixed-size stack buffer `qos_str` (256 bytes). Since the input length is not validated, an attacker can overwrite the stack frame, leading to a Denial of Service (DoS) or arbitrary code execution. |
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| Fonte | ⚠️ https://github.com/QIU-DIE/cve-nneeww/issues/1 |
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| Utilizador | hhsw34 (UID 91076) |
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| Submissão | 09/02/2026 12h33 (há 8 meses) |
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| Moderação | 20/02/2026 15h41 (11 days later) |
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| Estado | Aceite |
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| Entrada VulDB | 347107 [Tenda A21 1.0.0.0 /goform/formSetQosBand set_qosMib_list Excesso de tampão] |
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| Pontos | 20 |
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