CVE-2026-19824 is a high-severity stack-based buffer overflow vulnerability affecting the Tenda W20E router firmware version 15.11.0.6(1068_1546_841)_CN_TDC. The vulnerability arises from improper handling of the IPMacBindRule argument in the ipMacBindListStore function of the /goform/addIpMacBind file. This flaw allows remote attackers to cause a buffer overflow on the stack, potentially leading to arbitrary code execution or denial of service. Exploit code has been publicly released, increasing the risk of exploitation. No vendor advisory or patch information is currently available, and the vulnerability is not in a cloud service environment.

Successful exploitation can lead to remote code execution or denial of service on the affected Tenda W20E device. Given the availability of public exploit code, the risk of attacks leveraging this vulnerability is elevated. The vulnerability requires no user interaction and can be triggered remotely, making it a significant threat to affected devices.

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 and monitor for unusual activity. No vendor-provided mitigation or temporary fix is currently documented.