Tenda W3 1.0.0.3(2204) HTTP R7WebsSecurityHandler Password stack-based overflow

Summaryinfo

A vulnerability categorized as critical has been discovered in Tenda W3 1.0.0.3(2204). Affected by this issue is the function R7WebsSecurityHandler of the component HTTP Handler. Executing a manipulation of the argument Password can lead to stack-based overflow. This vulnerability is tracked as CVE-2026-36794. The attack can be launched remotely. No exploit exists.

Detailsinfo

A vulnerability has been found in Tenda W3 1.0.0.3(2204) and classified as critical. This vulnerability affects the function R7WebsSecurityHandler of the component HTTP Handler. The manipulation of the argument password with an unknown input leads to a stack-based overflow vulnerability. The CWE definition for the vulnerability is CWE-121. A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function). As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

Shenzhen Tenda Technology Co., Ltd Tenda W3 Wireless Router v1.0.0.3(2204) was discovered to contain multiple stack overflows in the R7WebsSecurityHandler function via the username and password parameters. These vulnerabilities allow attackers to cause a Denial of Service (DoS) via a crafted HTTP request.

The advisory is shared for download at github.com. This vulnerability was named CVE-2026-36794 since 04/06/2026. The exploitation appears to be easy. The attack can be initiated 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

• W3

Version

• 1.0.0.3(2204)

License

• commercial

Website

• Vendor: https://www.tenda.com.cn/

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