Tenda W20E 15.11.0.6 HTTP fromSetDhcpRules bindMACAddr buffer overflow

Summaryinfo

A vulnerability, which was classified as critical, was found in Tenda W20E 15.11.0.6. Affected by this vulnerability is the function fromSetDhcpRules of the component HTTP Handler. The manipulation of the argument bindMACAddr results in buffer overflow. This vulnerability was named CVE-2026-36819. The attack may be performed from remote. There is no available exploit.

Detailsinfo

A vulnerability was found in Tenda W20E 15.11.0.6. It has been classified as critical. Affected is the function fromSetDhcpRules of the component HTTP Handler. The manipulation of the argument bindMACAddr with an unknown input leads to a buffer overflow vulnerability. CWE is classifying the issue as 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. This is going to have an impact on 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 bindMACAddr parameter of the fromSetDhcpRules function. This vulnerability allows attackers to cause a Denial of Service (DoS) via a crafted HTTP request.

The advisory is available at github.com. This vulnerability is traded as CVE-2026-36819 since 04/06/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (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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