CVE-2026-5687 is a stack-based buffer overflow vulnerability affecting Tenda CX12L firmware version 16.03.53.12. It arises from improper validation of the 'page' argument in the fromNatStaticSetting function located in /goform/NatStaticSetting. This flaw allows remote attackers to cause memory corruption potentially leading to arbitrary code execution or denial of service. The vulnerability requires no user interaction and low privileges to exploit. The CVSS 4.0 base score is 8.7, indicating high severity. Although a public exploit exists, no official patch or vendor advisory detailing remediation is currently available.

Successful exploitation of this vulnerability can lead to stack-based buffer overflow, which may allow remote attackers to execute arbitrary code or cause denial of service on affected devices. The vulnerability is exploitable remotely without user interaction and requires only low privileges, increasing the risk of compromise. The availability of a public exploit further elevates the threat level. No evidence of exploitation in the wild has been reported yet.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, users should consider limiting network exposure of the affected device, such as restricting remote access to management interfaces. Monitor vendor channels for updates and apply patches promptly once available.