The Tenda F1202 router firmware version 1.2.0.20(408) contains a stack-based buffer overflow vulnerability in the formWrlExtraSet function, specifically in the handling of the delno argument within the /goform/WrlExtraSet endpoint. This vulnerability allows remote attackers to cause a buffer overflow, potentially leading to arbitrary code execution or denial of service. The vulnerability has a CVSS 4.0 base score of 8.7, indicating high severity, with network attack vector, low attack complexity, no privileges or user interaction required, and high impact on confidentiality, integrity, and availability. No official patch or remediation level has been published by the vendor.

Successful exploitation of this vulnerability could allow a remote attacker to execute arbitrary code or cause a denial of service on the affected Tenda F1202 device. The vulnerability impacts confidentiality, integrity, and availability of the device. There are no reports of active exploitation in the wild, but a public exploit exists.

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 available.