Tenda W20E 15.11.0.6 HTTP formAddWewifiWhiteUser wewifiWhiteUserInfo buffer overflow

Summaryinfo

A vulnerability labeled as critical has been found in Tenda W20E 15.11.0.6. The affected element is the function formAddWewifiWhiteUser of the component HTTP Handler. Such manipulation of the argument wewifiWhiteUserInfo leads to buffer overflow. This vulnerability is listed as CVE-2026-36818. The attack may be performed from remote. There is no available exploit.

Detailsinfo

A vulnerability, which was classified as critical, has been found in Tenda W20E 15.11.0.6. Affected by this issue is the function formAddWewifiWhiteUser of the component HTTP Handler. The manipulation of the argument wewifiWhiteUserInfo with an unknown input leads to a buffer overflow vulnerability. Using CWE to declare the problem leads to 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, leading to a buffer overflow. Impacted is confidentiality, integrity, and availability. CVE summarizes:

Shenzhen Tenda Technology Co., Ltd Tenda W20E v15.11.0.6 was discovered to contain a buffer overflow in the wewifiWhiteUserInfo parameter of the formAddWewifiWhiteUser function. This vulnerability allows attackers to cause a Denial of Service (DoS) via a crafted HTTP request.

The advisory is shared for download at github.com. This vulnerability is handled as CVE-2026-36818 since 04/06/2026. The exploitation is known to be easy. The attack may be launched remotely. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 06/09/2026).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Type

• Router Operating System

Vendor

• Tenda

Name

• W20E

Version

• 15.11.0.6

License

• commercial

Website

• Vendor: https://www.tenda.com.cn/

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