CVE-2026-5354 Trendnet TEW-657BRM setup.cgi vpn_connect os command injection

Medium 5.3 Published 2 Apr 2026 Updated 2 Apr 2026

Remote attackers can execute arbitrary OS commands via the vpn_connect function 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-2026-5354?

CVE-2026-5354 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 flaw has been found in Trendnet TEW-657BRM 1.00.1. Affected by this vulnerability is the function vpn_connect of the file /setup.cgi. Executing a manipulation of the argument policy_name can lead to os command injection. The attack can be executed remotely. The exploit has been published and may be used. 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-2026-5354?

It affects 1 product.

Products include Trendnet Tew-657brm Firmware.

How do I fix CVE-2026-5354?

No fix has been published for CVE-2026-5354 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-2026-5354 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-5354 exists.

Sources

Also known as GHSA-j222-qjwr-c34g.