CVE-2026-67822 Tenda CVE debrief

Who should care

Network administrators and security teams responsible for Tenda W6-S 1.0.0.4(510) devices, as well as organizations using vulnerable configurations, should take immediate action to verify and apply vendor patches or updates. This vulnerability has a CVSS score of 9.8 and is classified as CRITICAL, indicating a high likelihood of exploitation and potential for significant impact.

Technical summary

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. This vulnerability has a CVSS score of 9.8 and is classified as CRITICAL. Network administrators and security teams should take immediate action to verify and apply vendor patches or updates.

Defensive priority

Critical vulnerability in Tenda W6-S 1.0.0.4(510) with CVSS score of 9.8, requires immediate attention.

Recommended defensive actions

• Verify and apply vendor patches or updates for Tenda W6-S 1.0.0.4(510)
• Restrict access to the /goform/wifiSSIDset endpoint
• Monitor network traffic for suspicious activity
• Consider implementing compensating controls for vulnerable systems
• Review and update incident response plans to address potential exploitation
• Conduct a thorough risk assessment to identify potential vulnerabilities in Tenda W6-S 1.0.0.4(510) deployments
• Implement additional security measures, such as network segmentation and access controls, to reduce the attack surface

Evidence notes

Evidence from official CVE and NVD sources indicates a stack-based buffer overflow vulnerability in Tenda W6-S 1.0.0.4(510). Limited details available on affected scope and vendor remediation. 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. Network administrators and security teams should verify and apply vendor patches or updates for Tenda W6-S 1.0.0.4(510) and monitor network traffic for suspicious activity.

Official resources