A critical vulnerability (CVE-2026-75784) has been identified in TRENDnet TEW-WLC100 firmware version 1v2.07b01. The flaw exists in the HTTP Header Handler component of the embedded nginx web server (file /usr/nginx/sbin/nginx), specifically within function FUN_0040da4c. A stack-based buffer overflow is triggered by manipulating the 'Server' argument in HTTP headers, enabling remote attackers to execute arbitrary code. The vulnerability affects the TRENDnet TEW-WLC100 appliance and its bundled nginx implementation. With a CVSS score of 10.0, this issue represents a severe risk due to remote exploitability and the availability of public proof-of-concept code. Immediate mitigation requires applying firmware updates from the vendor. Network administrators are advised to block unnecessary HTTP header modifications at perimeter firewalls until patches are deployed.