CVE-2026-5350: Trendnet TEW-657BRM setup.cgi update_pcdb stack-based overflow
A security flaw has been discovered in Trendnet TEW-657BRM 1.00.1. The impacted element is the function updatepcdb of the file /setup.cgi. The manipulation of the argument macpcdba results in stack-based buffer overflow. The attack can be launched remotely. The exploit has been released to the public and may be used for attacks. The vendor confirms, that "[t]he product in question (...) has been discontinued and end of life since June 23, 2011, that is more than 14 years ago. We no longer provide support for this product, so we are not able to confirm the vulnerabilities. We will make an announcement on our website's product support page and notify customers who registered their products with us." This vulnerability only affects products that are no longer supported by the maintainer.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Compensating control
Since Trendnet TEW-657BRM is end-of-life and the vulnerability can be launched remotely via /setup.cgi (function update_pcdb) using argument mac_pc_dba, restrict network access to the device so that /setup.cgi cannot be reached from untrusted networks (e.g., block inbound WAN access to the device at the firewall/ACL and allow only from trusted IPs if management access is required).