CVE-2026-5351 Trendnet TEW-657BRM setup.cgi add_wps_client os command injection

Medium 5.3 Published 2 Apr 2026 Updated 3 Apr 2026

Remote attackers can execute arbitrary OS commands via the wl_enrolee_pin parameter in the discontinued Trendnet TEW-657BRM router.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2026-5351?

CVE-2026-5351 is a medium-severity command injection vulnerability in Trendnet TEW-657BRM, published on 2 Apr 2026. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

A weakness has been identified in Trendnet TEW-657BRM 1.00.1. This affects the function add_wps_client of the file /setup.cgi. This manipulation of the argument wl_enrolee_pin causes os command injection. The attack may be initiated remotely. The exploit has been made available to the public and could 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.

Weakness: CWE-78, CWE-77

Which versions are affected by CVE-2026-5351?

It affects 1 product.

Products include Trendnet Tew-657brm Firmware.

How do I fix CVE-2026-5351?

No fix has been published for CVE-2026-5351 yet. Limit exposure of the affected software until one is available.

Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.

Is CVE-2026-5351 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-5351 exists.

Sources

Also known as GHSA-3w99-p9rf-w2qj.