CVE-2026-5548: Stack Overflow in Tenda AC10 httpd

The stack-based buffer overflow vulnerability in the Tenda AC10's HTTP daemon is particularly concerning due to its remote accessibility and potential for code execution. A successful exploit could allow an attacker to gain complete control of the router, enabling them to modify configurations, intercept network traffic, and potentially pivot to other devices on the network. This could lead to data breaches, denial-of-service attacks, and unauthorized access to sensitive information. The ability to remotely trigger this overflow significantly increases the attack surface and potential for widespread exploitation, especially given the prevalence of Tenda routers in home and small business networks.

1. Reserved2026-04-04
2. Published2026-04-05
3. Modified2026-04-06
4. EPSS updated2026-04-12

The primary mitigation for CVE-2026-5548 is to upgrade to a patched firmware version from Tenda as soon as it becomes available. Until then, several temporary measures can be implemented. Deploying a Web Application Firewall (WAF) with rules to filter requests containing suspicious sys.userpass parameters can help prevent exploitation. Additionally, carefully review and restrict access to the router's web interface, limiting it to trusted networks. Monitor router logs for unusual activity, particularly requests to /bin/httpd with malformed or excessively long sys.userpass values. Consider implementing network segmentation to limit the impact of a potential compromise.