Tenda W6-S 1.0.0.4(510) WiFi SSID Setting /goform/wifiSSIDset formwrlSSIDset GO/index stack-based overflow

Summaryinfo

A vulnerability categorized as very critical has been discovered in Tenda W6-S 1.0.0.4(510). The impacted element is the function formwrlSSIDset of the file /goform/wifiSSIDset of the component WiFi SSID Setting. Such manipulation of the argument GO/index leads to stack-based overflow. This vulnerability is documented as CVE-2026-67822. The attack can be executed remotely. There is not any exploit available.

Detailsinfo

A vulnerability was found in Tenda W6-S 1.0.0.4(510) and classified as very critical. Affected by this issue is the function formwrlSSIDset of the file /goform/wifiSSIDset of the component WiFi SSID Setting. The manipulation of the argument GO/index with an unknown input leads to a stack-based overflow vulnerability. Using CWE to declare the problem leads to 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). Impacted is confidentiality, integrity, and availability. CVE summarizes:

Tenda W6-S 1.0.0.4(510) contains a stack-based buffer overflow vulnerability in the /goform/wifiSSIDset endpoint. The function formwrlSSIDset uses sprintf to copy user-controlled 'GO' and 'index' parameters into a 64-byte stack buffer without length restriction, leading to stack overflow.

The advisory is available at github.com. This vulnerability is handled as CVE-2026-67822 since 07/30/2026. The exploitation is known to be easy. The attack may be launched 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 07/31/2026).

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

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-51587). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Type

• Router Operating System

Vendor

• Tenda

Name

• W6-S

Version

• 1.0.0.4(510)

License

• commercial

Website

• Vendor: https://www.tenda.com.cn/

CPE 2.3info

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CPE 2.2info

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Entryinfo

If you want to get best quality of vulnerability data, you may have to visit VulDB.

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