CVE-2026-5550: Stack Overflow in Tenda AC10 httpd

The stack-based buffer overflow vulnerability in Tenda AC10's httpd allows a remote attacker to potentially overwrite critical memory regions. This can lead to a denial-of-service (DoS) condition, rendering the device unresponsive. More concerningly, an attacker could leverage this overflow to inject and execute arbitrary code on the affected device, gaining complete control over the router. Given the router's role as a gateway and often a point of access to internal network resources, a successful compromise could facilitate lateral movement and broader network infiltration. The impact is amplified if the router handles sensitive data or provides access to critical services.

1. Reserved2026-04-04
2. Published2026-04-05
3. Modified2026-04-07
4. EPSS updated2026-04-12

The primary mitigation for CVE-2026-5550 is to upgrade the Tenda AC10 firmware to a patched version as soon as it becomes available from Tenda. Until a patch is available, consider implementing temporary workarounds. These may include restricting access to the /bin/httpd endpoint via a firewall or web application firewall (WAF). Carefully review and restrict user permissions related to password changes to minimize the attack surface. Monitor network traffic for suspicious patterns indicative of exploitation attempts, such as unusually long or malformed requests to the password change endpoint.