| Title | Tenda Router US_W20EV4.0br_V15.11.0.61068_1546_841_CN_TDC Memory Corruption |
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| Description | Tenda W20E firmware US_W20EV4.0br_V15.11.0.61068_1546_841_CN_TDC contains a stack-based buffer overflow in the formQOSRuleDel HTTP handler. The handler retrieves the attacker-controlled qosIndex parameter using websGetVar() and copies it into fixed-size stack buffer using strcpy() without length validation. Values of more characters overwrite adjacent stack memory and reliably crash the web management service. The confirmed impact is denial of service. |
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| Source | ⚠️ https://github.com/Amalll-Sec/router-vulnerability-research/blob/main/advisories/Tenda/W20E/formQOSRuleDel/README.md |
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| User | AmaIIl (UID 29184) |
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| Submission | 08/04/2026 16:09 (2 months ago) |
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| Moderation | 09/13/2026 06:58 (1 month later) |
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| Status | Duplicate |
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| VulDB entry | 389956 [Tenda W20E 15.11.0.6(1068_1546_841)_CN_TDC QoS Rule Deletion /goform/delQos formQOSRuleDel qosIndex stack-based overflow] |
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| Points | 0 |
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