| Title | Tenda W20E Enterprise Router V15.11.0.6 Stack-based Buffer Overflow |
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| Description | A stack-based buffer overflow vulnerability has been identified in the formSetPortMirror function of the Tenda W20E router. By sending a crafted portMirrorMirroredPorts parameter, an authenticated attacker can overflow a 256-byte stack buffer, leading to a service crash or Remote Code Execution (RCE).
The formSetPortMirror function handles port mirroring configuration. It retrieves the user-controlled parameter portMirrorMirroredPorts and uses sprintf to format it into a fixed-size stack buffer sMibValue (256 bytes).
The lack of bounds checking on pMirroredPorts allows an attacker to provide a string longer than 256 bytes, overwriting the saved Link Register (LR) on the stack. |
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| Source | ⚠️ https://github.com/Robots10/IoT_vlu/blob/main/reports/Tenda/formSetPortMirror/portMirrorMirroredPorts.md |
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| User | hacker128 (UID 93883) |
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| Submission | 05/24/2026 17:22 (17 days ago) |
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| Moderation | 06/07/2026 18:06 (14 days later) |
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| Status | Accepted |
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| VulDB entry | 369142 [Tenda W20E 15.11.0.6 /goform/setPortMirror formSetPortMirror portMirrorMirroredPorts stack-based overflow] |
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| Points | 20 |
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