Tenda CH22 Parameter webtypelibrary formWebTypeLibrary Stack-basierter Überlauf

The stack-based buffer overflow vulnerability in the Tenda CH22 router presents a significant security risk. An attacker, leveraging crafted input to the webSiteId parameter, can overwrite adjacent memory regions on the stack. This can lead to a denial-of-service (DoS) condition, crashing the router and disrupting network connectivity. More critically, successful exploitation could allow the attacker to execute arbitrary code on the device, granting them complete control over the router and potentially the network it serves. This could include data exfiltration, configuration modification, and the deployment of malware. Given the router's role as a gateway, a compromised device could serve as a pivot point for attacks against internal network resources, significantly expanding the blast radius. The publicly disclosed nature of this exploit increases the likelihood of widespread exploitation.

Small and medium-sized businesses (SMBs) and home users who rely on Tenda CH22 routers running the vulnerable firmware version 1.0.0.1 are at risk. Organizations with multiple Tenda CH22 routers deployed in their networks face a broader attack surface. Shared hosting environments utilizing Tenda routers for network connectivity are also particularly vulnerable.

• tenda: Monitor router logs for unusual requests to /goform/webtypelibrary with potentially malformed webSiteId parameters. Use network intrusion detection systems (NIDS) to identify attempts to exploit the vulnerability. • generic web: Use curl/wget to probe the /goform/webtypelibrary endpoint with various payloads and observe for crash or error responses.

1. 2026-03-31Disclosure

   disclosure

1. Reserviert2026-03-31
2. Veröffentlicht2026-03-31
3. EPSS aktualisiert2026-04-08

Addressing CVE-2026-5204 requires a multi-faceted approach. The primary mitigation is to upgrade the Tenda CH22 router to a firmware version that includes a patch for this vulnerability. Monitor Tenda's official website and security advisories for the release of a patched firmware. In the interim, implement network segmentation to limit the router's access to sensitive internal resources. Consider deploying a Web Application Firewall (WAF) or proxy server to filter malicious traffic and block requests containing potentially harmful webSiteId parameters. Restrict access to the router's web interface using strong passwords and multi-factor authentication. Monitor network traffic for unusual activity originating from or destined to the router. After upgrading the firmware, confirm the vulnerability is resolved by attempting to reproduce the exploit with a safe test payload; the router should not crash or exhibit unexpected behavior.