Executive brief
The TRENDnet TEW-WLC100P is a wireless access point controller used to manage enterprise network connectivity. A stack buffer overflow vulnerability in its DHCP processing component allows an attacker on the local network to crash the device or execute arbitrary code by sending a specially crafted DHCP response, potentially compromising the controller and all connected wireless devices.
Technical details
A stack-based buffer overflow exists in the netifd daemon's DHCP blobmsg handler (file /sbin/netifd) when processing DHCP Option 42 (NTP Server). The vulnerability is triggered when a malicious DHCP server on the same local network sends an oversized payload in this field, overflowing a fixed-size stack buffer. An attacker with network access on the LAN can craft a DHCP response that overwrites the return address register ($ra), redirecting execution to attacker-controlled memory. This enables remote code execution with the privileges of the netifd process. Exploitation requires the device to request or renew a DHCP lease and does not require authentication. A public proof-of-concept has been published demonstrating control of the instruction pointer.
Affected products
- TRENDnet TEW-WLC100P 12.07b01
Timeline
- 2026-08-18: disclosed
- exploited: Public proof-of-concept available