Remote Buffer Overflow Vulnerability in TRENDnet TEW-821DAP Access Point

A significant buffer overflow vulnerability, identified as CVE-2026-15484, has been discovered in the TRENDnet TEW-821DAP 1.12B01 wireless access point. Specifically, the flaw resides in the sub_41EC14 function of the /goform/tools_nslookup component, related to the handling of the ssi element. This vulnerability allows for remote exploitation, potentially enabling an attacker to execute arbitrary code on the device. However, TRENDnet has stated that the affected product, version 1.12B01 and the v1.0R hardware revision of the TEW-821DAP, has reached End-of-Life (EOL) status, meaning the vendor will not provide patches or support for this specific vulnerability. Defenders should be aware that EOL devices represent a persistent risk.

Impact

Successful exploitation of CVE-2026-15484 could allow an unauthenticated remote attacker to achieve arbitrary code execution on the TRENDnet TEW-821DAP device. This could lead to full compromise of the access point, enabling attackers to intercept network traffic, disrupt services, or use the device as a pivot point for further attacks within the network. Given the EOL status of the product, organizations using this device will not receive official security patches, making them perpetually vulnerable to this critical flaw and requiring immediate mitigation strategies.

Recommendation

• Immediately identify and decommission or isolate all TRENDnet TEW-821DAP 1.12B01 or v1.0R devices due to the unpatchable nature of CVE-2026-15484.
• If immediate decommissioning is not possible, segment affected devices onto an isolated network segment with strict outbound and inbound traffic controls, allowing only essential communication.
• Implement network intrusion detection systems (NIDS) to monitor for unusual traffic patterns originating from or destined for affected TRENDnet TEW-821DAP devices, although specific detection rules are difficult without more exploit details.