Plattform
tenda
Komponente
tenda
CVE-2026-5687 describes a stack-based buffer overflow vulnerability present in the Tenda CX12L router, specifically version 16.03.53.12. This flaw arises from improper handling of arguments within the /goform/NatStaticSetting function, allowing attackers to manipulate the page parameter. Successful exploitation could lead to arbitrary code execution on the vulnerable device, potentially granting an attacker complete control. A fix is pending from Tenda.
The primary impact of CVE-2026-5687 is the potential for remote code execution (RCE) on the Tenda CX12L router. An attacker can exploit this vulnerability by crafting a malicious request that overflows the buffer in the NatStaticSetting function. This could allow them to execute arbitrary commands with the privileges of the router's operating system, effectively gaining full control over the device. The router's configuration, including network settings, firewall rules, and connected devices, could be modified or compromised. Furthermore, an attacker could use the compromised router as a pivot point to launch attacks against other devices on the network, expanding the blast radius of the vulnerability. Given the router's role in connecting devices to the internet, a successful exploit could also expose sensitive data transmitted through the router to external threats.
CVE-2026-5687 is considered a high-risk vulnerability due to its remote exploitability and potential for code execution. Public proof-of-concept (POC) exploits are already available, indicating a high probability of active exploitation. The vulnerability was published on 2026-04-06. The EPSS score is likely to be medium or high, reflecting the ease of exploitation and potential impact. Monitor security advisories from Tenda and relevant security communities for updates and further information.
Exploit-Status
EPSS
0.05% (15% Perzentil)
CISA SSVC
The immediate mitigation for CVE-2026-5687 is to upgrade the Tenda CX12L router to a patched firmware version as soon as it becomes available from Tenda. Until a patch is released, consider implementing temporary workarounds to reduce the risk of exploitation. Strict input validation on the page parameter within the /goform/NatStaticSetting function can help prevent buffer overflows. This could involve limiting the length of the parameter or validating its format to ensure it conforms to expected values. Network segmentation can also limit the potential impact of a successful exploit by isolating the router from critical network resources. Monitor router logs for suspicious activity, particularly requests to the /goform/NatStaticSetting endpoint. If a rollback is necessary due to a faulty upgrade, revert to a previous, known-stable firmware version. After upgrading, confirm the vulnerability is mitigated by attempting to reproduce the exploit with a test payload; if the payload fails to trigger the overflow, the mitigation is likely successful.
Actualice el firmware del router Tenda CX12L a una versión corregida. Consulte el sitio web del fabricante o la documentación del producto para obtener instrucciones sobre cómo actualizar el firmware. Esta vulnerabilidad permite la ejecución remota de código, por lo que es crucial aplicar la actualización lo antes posible.
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It's a unique identifier for a specific security vulnerability in the Tenda CX12L router.
It's a type of programming error that can allow an attacker to execute malicious code on a device.
Isolate the router from the internet and consider replacing it with a more secure model.
Currently, no update is available (fix: none).
Implement strict firewall rules, monitor network traffic, and consider a more secure router.
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