CVE-2026-24112
Received Received - Intake
Buffer Overflow in Tenda W20E addWewifiWhiteUser Function

Publication date: 2026-03-02

Last updated on: 2026-03-03

Assigner: MITRE

Description
An issue was discovered in Tenda W20E V4.0br_V15.11.0.6. Attackers may exploit the vulnerability by specifying the value of `userInfo`. When `userInfo` is passed into the `addWewifiWhiteUser` function and processed by `sscanf` without size validation, it could lead to a buffer overflow vulnerability.
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Meta Information
Published
2026-03-02
Last Modified
2026-03-03
Generated
2026-06-16
AI Q&A
2026-03-02
EPSS Evaluated
2026-06-15
NVD
CVE-2026-24112
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
tenda w20e_firmware 15.11.0.6
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Exploitability
CWE
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KEV
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CWE ID Description
CWE-120 The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer.
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Executive Summary

This vulnerability exists in the Tenda W20E router firmware version 4.0br_V15.11.0.6. It occurs when an attacker specifies a crafted value for the parameter `userInfo` that is passed into the function `addWewifiWhiteUser`. Inside this function, the `sscanf` function processes `userInfo` without validating the size of the input, which can lead to a buffer overflow.

A buffer overflow happens when more data is written to a buffer than it can hold, potentially allowing attackers to overwrite adjacent memory, which can lead to unexpected behavior or exploitation.

Impact Analysis

The buffer overflow vulnerability in the Tenda W20E router could allow attackers to execute arbitrary code, cause the device to crash, or disrupt normal operation. This could lead to unauthorized access, denial of service, or compromise of the device's security.

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